Puppet OS hardening

Description

This Puppet module provides secure configuration of your base OS with hardening.

Requirements

• Puppet

Parameters

• system_environment = default define the context in which the system runs. Some options don't work for docker/lxc
• desktop_enabled = false true if this is a desktop system, ie Xorg, KDE/GNOME/Unity/etc
• enable_ipv4_forwarding = false true if this system requires packet forwarding in IPv4 (eg Router), false otherwise
• enable_ipv6_forwarding = false true if this system requires packet forwarding in IPv6 (eg Router), false otherwise
• enable_ipv6 = false false to disable ipv6 on this system, true to enable
• manage_ipv6 = true true to harden ipv6 setup, false to ignore ipv6 completely
• enable_log_martians = true true to enable logging on suspicious / unroutable network packets, false otherwise WARNING - this might generate huge log files!
• arp_restricted = true true if you want the behavior of announcing and replying to ARP to be restricted, false otherwise
• enable_rpfilter = true true to enable reverse path filtering (discard bogus packets), false otherwise
• extra_user_paths = [] add additional paths to the user's PATH variable (default is empty).
• umask = "027" umask used for the creation of new home directories by useradd / newusers
• password_max_age = 60 maximum password age
• password_min_age = 7 minimum password age (before allowing any other password change)
• auth_retries = 5 the maximum number of authentication attempts, before the account is locked for some time
• auth_lockout_time = 600 time in seconds that needs to pass, if the account was locked due to too many failed authentication attempts
• login_retries = 5 the maximum number of login retries if password is bad (normally overridden by PAM / auth_retries)
• login_timeout = 60 authentication timeout in seconds, so login will exit if this time passes
• allow_login_without_home = false true if to allow users without home to login
• passwdqc_enabled = true true if you want to use strong password checking in PAM using passwdqc
• passwdqc_options = "min=disabled,disabled,16,12,8" set to any option line (as a string) that you want to pass to passwdqc
• manage_pam_unix = false true if you want pam_unix managed by this module
• enable_pw_history = true true if you want pam_unix to remember password history to prevent reuse of passwords (requires manage_pam_unix = true)
• pw_remember_last = 5 the number of last passwords (e.g. 5 will prevent user to reuse any of her last 5 passwords)
• allow_change_user = false if a user may use su to change his login
• ignore_users = [] array of system user accounts that should not be hardened (password disabled and shell set to /usr/sbin/nologin)
• chfn_restrict = "" which fields may be changed by regular users using chfn
• enable_module_loading = true true if you want to allowed to change kernel modules once the system is running (eg modprobe, rmmod)
• load_modules = [] load this modules via initramfs if enable_module_loading is false
• enable_sysrq = false true to enable the magic sysrq key, false otherwise
• enable_core_dump = false false to prevent the creation of core dumps, true otherwise
• enable_stack_protection = true for Address Space Layout Randomization. ASLR can help defeat certain types of buffer overflow attacks. ASLR can locate the base, libraries, heap, and stack at random positions in a process's address space, which makes it difficult for an attacking program to predict the memory address of the next instruction.
• cpu_vendor = 'intel' only required if enable_module_loading = false: set the CPU vendor for modules to load
• root_ttys = ["console","tty1","tty2","tty3","tty4","tty5","tty6"] registered TTYs for root
• whitelist = [] all files which should keep their SUID/SGID bits if set (will be combined with pre-defined whiteliste of files)
• blacklist = [] all files which should have their SUID/SGID bits removed if set (will be combined with pre-defined blacklist of files)
• remove_from_unknown = false true if you want to remove SUID/SGID bits from any file, that is not explicitly configured in a blacklist. This will make every Chef run search through the mounted filesystems looking for SUID/SGID bits that are not configured in the default and user blacklist. If it finds an SUID/SGID bit, it will be removed, unless this file is in your whitelist.
• dry_run_on_unknown = false like remove_from_unknown above, only that SUID/SGID bits aren't removed. It will still search the filesystems to look for SUID/SGID bits but it will only print them in your log. This option is only ever recommended, when you first configure remove_from_unknown for SUID/SGID bits, so that you can see the files that are being changed and make adjustments to your whitelist and blacklist.

Usage

After adding this module, you can use the class:

class { 'os_hardening': }

Local Testing

For local testing you can use vagrant and Virtualbox of VMWare to run tests locally. You will have to install Virtualbox and Vagrant on your system. See Vagrant Downloads for a vagrant package suitable for your system. For all our tests we use test-kitchen. If you are not familiar with test-kitchen please have a look at their guide.

Next install test-kitchen:

# Install dependencies
gem install bundler
bundle install

# Fetch tests
bundle exec thor kitchen:fetch-remote-tests

# Do lint checks
bundle exec rake lint

# Do spec checks
bundle exec rake spec

# fast test on one machine
bundle exec kitchen test default-ubuntu-1204

# test on Debian-based machines
bundle exec kitchen test

# for development
bundle exec kitchen create default-ubuntu-1204
bundle exec kitchen converge default-ubuntu-1204

For more information see test-kitchen

Contributors + Kudos

• Dominik Richter arlimus
• Edmund Haselwanter ehaselwanter
• Christoph Hartmann chris-rock
• Thomas Dütsch a-tom
• Patrick Meier atomic111
• Artem Sidorenko artem-sidorenko
• Kurt Huwig kurthuwig
• Matthew Haughton 3flex
• Reik Keutterling spielkind
• Daniel Dreier danieldreier
• Timo Goebel timogoebel
• Tristan Helmich fadenb

For the original port of chef-os-hardening to puppet:

• Artem Sidorenko artem-sidorenko
• Frank Kloeker eumel8

Thank you all!!

License and Author

• Author:: Dominik Richter dominik.richter@gmail.com
• Author:: Deutsche Telekom AG

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.