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Google PAM Module

Project description

Google PAM Module

This package implements a Python PAM module to authenticate users against a Google domain. The following features are provided:

  • Select any Google domain.

  • Allow only users from a certain group.

  • A script to install all Google users as system users.

  • Password caching using files or memcached.

  • Advanced logging setup.

The code was inspired by the python_pam.so examples and the TracGoogleAppsAuthPlugin trac authentication plugin.

Configuring Google PAM on Ubuntu 12.04 LTS

  1. Install a few required packages:

    # apt-get install python-setuptools python-gdata python-bcrypt \
                      python-memcache libpam-python
  2. Now install cipher.googlepam using easy install:

    # easy_install cipher.googlepam
  3. Add all users to the system:

    # add-google-users -v -d <domain> -u <admin-user> -p <admin-pwd> \
                       -g <google-group> -a <system-admin-group>

    Note: Use the -h option to discover all options.

  4. Create a /etc/pam_google.conf configuration file:

    [googlepam]
    domain=<domain>
    admin-username=<admin-user>
    admin-password=<admin-pwd>
    group=<google-group>
    excludes = root [<user> ...]
    prompt = Google Password:
    cache = file|memcache
    
    [file-cache]
    file = /var/lib/pam_google/user-cache
    lifespan = 1800
    
    [memcache-cache]
    key-prefix = googlepam.
    host = 127.0.0.1
    port = 11211
    debug = false
    lifespan = 1800
    
    [loggers]
    keys = root, pam
    
    [logger_root]
    handlers = file
    level = INFO
    
    [logger_pam]
    qualname = cipher.googlepam.PAM
    handlers = file
    propagate = 0
    level = INFO
    
    [handlers]
    keys = file
    
    [handler_file]
    class = logging.handlers.RotatingFileHandler
    args = ('/var/log/pam-google.log', 'a', 10*1024*1024, 5)
    formatter = simple
    
    [formatters]
    keys = simple
    
    [formatter_simple]
    format = %(asctime)s %(levelname)s - %(message)s
    datefmt = %Y-%m-%dT%H:%M:%S
  5. Hide contents of the config file from the curious users:

    # chmod 600 /etc/pam_google.conf
  6. Put the Google PAM module in a sensible location:

    # ln -s /usr/local/lib/python2.7/dist-packages/cipher.googlepam-<version>-py2.7.egg/cipher/googlepam/pam_google.py /lib/security/pam_google.py
  7. Enable pam_google for all authentication. Add the following rule as the first rule in file /etc/pam.d/common-auth:

    auth    sufficient   pam_python.so /lib/security/pam_google.py -c /etc/pam_google.conf

Building a Debian package

  1. Install a few required packages:

    # apt-get install build-essential debhelper devscripts fakeroot quilt
  2. Download the latest cipher.googlepam tarball from PyPI (or build one with python setup.py sdist)

  3. Rename the tarball cipher.googlepam_VERSION.orig.tar.gz (note: underscore instead of the hyphen!), put it in the parent directory of the source tree (if you don’t have a source tree, just untar the tarball).

  4. Go to the source tree, run dch -i, make sure the version number in the changelog matches the package version, make sure your name and email are correct, write a changelog entry itself (e.g. something like ‘New upstream release’.)

  5. Run debuild. If everything’s fine, you should get a deb file in the parent directory.

Install the deb with sudo dpkg -i cipher.googlepam...deb; sudo apt-get -f install. Then edit /etc/cipher-googlepam/pam_google.conf and run add-google-users. You don’t need to manually edit PAM configuration if you use the .deb package.

CHANGES

1.5.1 (2012-10-11)

  • MemCache reliability fixes:

    • SECURITY FIX: do not use the same cache key for all users.

      Previously when one user logged in successfully, others could not log in using their own passwords – but the first user could now use her password to log in as anyone else.

    • Do not store custom classes in memcached so we don’t get unpickling errors caused by the special execution environment set up by pam_python.so. Previously the cached value was a subclass of tuple, now it’s a plain tuple, so old caches will continue to work with the new code.

  • FileCache reliability fixes:

    • Avoid incorrect cache lookups (or invalidations) when a username is a proper prefix of some other username.

    • Avoid cache poisoning if usernames contain embedded ‘::’ separators or newlines.

    • Avoid exceptions on a race condition if the cache file disappears after we check for its existence but before we open it for reading.

  • Add missing test file for multi-group support. It was accidentally left out of the last release causing a test failure.

  • Make add-google-users skip users that already exist without printing scary error messages that make it seem the script aborted early.

1.5.0 (2012-10-09)

  • Support multiple Google groups. The authenticating user has to be a member of any one of them for access to be allowed.

  • Added add-google-users new option –exclude to skip adding some users (e.g. the ‘admin’ user might clash with an existing ‘admin’ group, causing the script to fail).

  • Added add-google-users option –add-to-group as a more meaningful alias for the old –admin-group option.

  • Added add-google-users option –add-to-group-command for completeness.

1.4.0 (2012-10-08)

  • Set umask to avoid world-readable log and cache files.

  • Add a space after the PAM prompt.

  • The add-google-users script now reads the pam_google config file to get the domain, username, password and group. You can also use -C/–config-file to specify a different config file.

  • add-google-users does not break if you don’t specify –admin-group.

  • Added Debian packaging.

1.3.0 (2012-04-24)

  • Added ability to cache authentication result, since some uses, such as Apache authentication can cause a lot of requests. File- and memcached-based caches have been implemented and are available/configurable in the configuration file.

  • Fully stubbed out the Google API for faster and simpler testing.

  • Removed all traces of Cipher’s specific account details.

  • Changed all headers to ZPL.

  • The package is ready for public release.

1.2.0 (2012-04-17)

  • Do not fail if the username already exists.

1.1.0 (2012-04-17)

  • Make the admin group configurable.

1.0.0 (2012-04-17)

  • PAM module authenticating against users in a group of a particular Google domain.

  • Script to add all users of a group within a Google domain as system users.

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