community.crypto.openssl_dhparam – Generate OpenSSL Diffie-Hellman Parameters

Note

This plugin is part of the community.crypto collection (version 1.9.6).

You might already have this collection installed if you are using the ansible package. It is not included in ansible-core. To check whether it is installed, run ansible-galaxy collection list.

To install it, use: ansible-galaxy collection install community.crypto.

To use it in a playbook, specify: community.crypto.openssl_dhparam.

Synopsis
Requirements
Parameters
Notes
See Also
Examples
Return Values

Synopsis

This module allows one to (re)generate OpenSSL DH-params.
This module uses file common arguments to specify generated file permissions.
Please note that the module regenerates existing DH params if they do not match the module’s options. If you are concerned that this could overwrite your existing DH params, consider using the backup option.
The module can use the cryptography Python library, or the openssl executable. By default, it tries to detect which one is available. This can be overridden with the select_crypto_backend option.

Requirements

The below requirements are needed on the host that executes this module.

Either cryptography >= 2.0
Or OpenSSL binary openssl

Parameters

Parameter	Choices/Defaults	Comments
attributes string added in 2.3 of ansible.builtin		The attributes the resulting file or directory should have. To get supported flags look at the man page for chattr on the target system. This string should contain the attributes in the same order as the one displayed by lsattr. The `=` operator is assumed as default, otherwise `+` or `-` operators need to be included in the string. aliases: attr
backup boolean	Choices: no ← yes	Create a backup file including a timestamp so you can get the original DH params back if you overwrote them with new ones by accident.
force boolean	Choices: no ← yes	Should the parameters be regenerated even it it already exists.
group string		Name of the group that should own the file/directory, as would be fed to chown.
mode raw		The permissions the resulting file or directory should have. For those used to /usr/bin/chmod remember that modes are actually octal numbers. You must either add a leading zero so that Ansible's YAML parser knows it is an octal number (like `0644` or `01777`) or quote it (like `'644'` or `'1777'`) so Ansible receives a string and can do its own conversion from string into number. Giving Ansible a number without following one of these rules will end up with a decimal number which will have unexpected results. As of Ansible 1.8, the mode may be specified as a symbolic mode (for example, `u+rwx` or `u=rw,g=r,o=r`). If `mode` is not specified and the destination file does not exist, the default `umask` on the system will be used when setting the mode for the newly created file. If `mode` is not specified and the destination file does exist, the mode of the existing file will be used. Specifying `mode` is the best way to ensure files are created with the correct permissions. See CVE-2020-1736 for further details.
owner string		Name of the user that should own the file/directory, as would be fed to chown.
path path / required		Name of the file in which the generated parameters will be saved.
return_content boolean added in 1.0.0 of community.crypto	Choices: no ← yes	If set to `yes`, will return the (current or generated) DH params' content as dhparams.
select_crypto_backend string added in 1.0.0 of community.crypto	Choices: auto ← cryptography openssl	Determines which crypto backend to use. The default choice is `auto`, which tries to use `cryptography` if available, and falls back to `openssl`. If set to `openssl`, will try to use the OpenSSL `openssl` executable. If set to `cryptography`, will try to use the cryptography library.
selevel string		The level part of the SELinux file context. This is the MLS/MCS attribute, sometimes known as the `range`. When set to `_default`, it will use the `level` portion of the policy if available.
serole string		The role part of the SELinux file context. When set to `_default`, it will use the `role` portion of the policy if available.
setype string		The type part of the SELinux file context. When set to `_default`, it will use the `type` portion of the policy if available.
seuser string		The user part of the SELinux file context. By default it uses the `system` policy, where applicable. When set to `_default`, it will use the `user` portion of the policy if available.
size integer	Default: 4096	Size (in bits) of the generated DH-params.
state string	Choices: absent present ←	Whether the parameters should exist or not, taking action if the state is different from what is stated.
unsafe_writes boolean added in 2.2 of ansible.builtin	Choices: no ← yes	Influence when to use atomic operation to prevent data corruption or inconsistent reads from the target file. By default this module uses atomic operations to prevent data corruption or inconsistent reads from the target files, but sometimes systems are configured or just broken in ways that prevent this. One example is docker mounted files, which cannot be updated atomically from inside the container and can only be written in an unsafe manner. This option allows Ansible to fall back to unsafe methods of updating files when atomic operations fail (however, it doesn't force Ansible to perform unsafe writes). IMPORTANT! Unsafe writes are subject to race conditions and can lead to data corruption.

Notes

Note

Supports check_mode.

Examples

- name: Generate Diffie-Hellman parameters with the default size (4096 bits)
  community.crypto.openssl_dhparam:
    path: /etc/ssl/dhparams.pem

- name: Generate DH Parameters with a different size (2048 bits)
  community.crypto.openssl_dhparam:
    path: /etc/ssl/dhparams.pem
    size: 2048

- name: Force regenerate an DH parameters if they already exist
  community.crypto.openssl_dhparam:
    path: /etc/ssl/dhparams.pem
    force: yes

Return Values

Common return values are documented here, the following are the fields unique to this module:

Key	Returned	Description
backup_file string	changed and if backup is `yes`	Name of backup file created. Sample: /path/to/dhparams.pem.2019-03-09@11:22~
dhparams string added in 1.0.0 of community.crypto	if state is `present` and return_content is `yes`	The (current or generated) DH params' content.
filename string	changed or success	Path to the generated Diffie-Hellman parameters. Sample: /etc/ssl/dhparams.pem
size integer	changed or success	Size (in bits) of the Diffie-Hellman parameters. Sample: 4096

Authors

Thom Wiggers (@thomwiggers)

© 2012–2018 Michael DeHaan
© 2018–2021 Red Hat, Inc.
Licensed under the GNU General Public License version 3.
https://docs.ansible.com/ansible/latest/collections/community/crypto/openssl_dhparam_module.html