crypto_policies

This Ansible role manages system-wide crypto policies.

This concept is well adopted since Red Hat Enterprise Linux 8 and in Fedora.

Requirements

The system-wide crypto policies are implemented and tested on RHEL 8/CentOS 8
and Fedora.

Role Variables

By default, this role will just report system status as described in the
following section.

• crypto_policies_policy

Use this variable to specify the desired crypto policy on the target system,
which can be either the base policy or a base policy with subpolicies
as accepted by the update-crypto-policies tool. For example FUTURE or
DEFAULT:NO-SHA1:GOST. The specified base policy and subpolicies
must be available on the target system.

The default value is null meaning the configuration is not changed and
the role will just collect the facts below.

The list of available base policies on the target system can be found in the
crypto_policies_available_policies variable and the list of available
subpolicies can be found in the crypto_policies_available_subpolicies variable.

• crypto_policies_reload

By default (true), updating crypto policies forces reload of some of
the daemons affected by crypto policies in the system. Setting false
prevents this behavior and is helpful if the role is executed during system
enrollment or some other follow-up tasks is expected to do it later.

• crypto_policies_reboot_ok

Crypto policies can not know all the custom applications using crypto
libraries that are affected by change of crypto policies so it is recommended
to reboot after changing crypto policies to make sure all of the services
and applications will read the new configuration files. By default (false),
if reboot is required, this role will set crypto_policies_reboot_required
variable as described below and it is up to the user of the role to reboot
the system afterwards, for example after applying some other changes that might
need reboot. If there are no other tasks in the playbook that require reboot,
you can set this value to true and this role will handle the reboot for you,
when needed.

Variables Exported by the Role

• crypto_policies_active

This fact contains the currently active policy name in the format as accepted
by crypto_policies_policy variable above.

• crypto_policies_available_policies

This is a list of all base policies available on the target system.
Custom policy files can be installed by copying the .pol files into
/etc/crypto-policies/policies directory (not implemented in this role yet).

• crypto_policies_available_subpolicies

This is a list of all subpolicies available on the target system.
Custom subpolicies can be installed by copying the .pmod files into
/etc/crypto-policies/policies/modules directory (not implemented in this
role yet).

• crypto_policies_available_modules

Deprecated alias to crypto_policies_available_subpolicies.

• crypto_policies_reboot_required

Default false - if true, this means a reboot is needed to apply
the changes made by the role

Dependencies

None.

Example Playbook

The following playbook configures the system to the default crypto policy
level without SHA1. The update is done without reboot (which is recommended
to do by the user afterwards).

- hosts: all
  roles:
    role: redhat.rhel_system_roles.crypto_policies
    vars:
      crypto_policies_policy: "DEFAULT:NO-SHA1"
      crypto_policies_reload: false

License

MIT, see the file LICENSE for more information.

Author Information

Jakub Jelen, 2020