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openssh_keypair.py
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openssh_keypair.py
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#!/usr/bin/python
# -*- coding: utf-8 -*-
# Copyright (c) 2018, David Kainz <dkainz@mgit.at> <dave.jokain@gmx.at>
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later
from __future__ import absolute_import, division, print_function
__metaclass__ = type
DOCUMENTATION = '''
---
module: openssh_keypair
author: "David Kainz (@lolcube)"
short_description: Generate OpenSSH private and public keys
description:
- "This module allows one to (re)generate OpenSSH private and public keys. It uses
ssh-keygen to generate keys. One can generate V(rsa), V(dsa), V(rsa1), V(ed25519)
or V(ecdsa) private keys."
requirements:
- ssh-keygen (if O(backend=openssh))
- cryptography >= 2.6 (if O(backend=cryptography) and OpenSSH < 7.8 is installed)
- cryptography >= 3.0 (if O(backend=cryptography) and OpenSSH >= 7.8 is installed)
extends_documentation_fragment:
- ansible.builtin.files
- community.crypto.attributes
- community.crypto.attributes.files
attributes:
check_mode:
support: full
diff_mode:
support: full
safe_file_operations:
support: full
options:
state:
description:
- Whether the private and public keys should exist or not, taking action if the state is different from what is stated.
type: str
default: present
choices: [ present, absent ]
size:
description:
- "Specifies the number of bits in the private key to create. For RSA keys, the minimum size is 1024 bits and the default is 4096 bits.
Generally, 2048 bits is considered sufficient. DSA keys must be exactly 1024 bits as specified by FIPS 186-2.
For ECDSA keys, size determines the key length by selecting from one of three elliptic curve sizes: 256, 384 or 521 bits.
Attempting to use bit lengths other than these three values for ECDSA keys will cause this module to fail.
Ed25519 keys have a fixed length and the size will be ignored."
type: int
type:
description:
- "The algorithm used to generate the SSH private key. V(rsa1) is for protocol version 1.
V(rsa1) is deprecated and may not be supported by every version of ssh-keygen."
type: str
default: rsa
choices: ['rsa', 'dsa', 'rsa1', 'ecdsa', 'ed25519']
force:
description:
- Should the key be regenerated even if it already exists
type: bool
default: false
path:
description:
- Name of the files containing the public and private key. The file containing the public key will have the extension C(.pub).
type: path
required: true
comment:
description:
- Provides a new comment to the public key.
type: str
passphrase:
description:
- Passphrase used to decrypt an existing private key or encrypt a newly generated private key.
- Passphrases are not supported for O(type=rsa1).
- Can only be used when O(backend=cryptography), or when O(backend=auto) and a required C(cryptography) version is installed.
type: str
version_added: 1.7.0
private_key_format:
description:
- Used when O(backend=cryptography) to select a format for the private key at the provided O(path).
- When set to V(auto) this module will match the key format of the installed OpenSSH version.
- For OpenSSH < 7.8 private keys will be in PKCS1 format except ed25519 keys which will be in OpenSSH format.
- For OpenSSH >= 7.8 all private key types will be in the OpenSSH format.
- Using this option when O(regenerate=partial_idempotence) or O(regenerate=full_idempotence) will cause
a new keypair to be generated if the private key's format does not match the value of O(private_key_format).
This module will not however convert existing private keys between formats.
type: str
default: auto
choices:
- auto
- pkcs1
- pkcs8
- ssh
version_added: 1.7.0
backend:
description:
- Selects between the V(cryptography) library or the OpenSSH binary V(opensshbin).
- V(auto) will default to V(opensshbin) unless the OpenSSH binary is not installed or when using O(passphrase).
type: str
default: auto
choices:
- auto
- cryptography
- opensshbin
version_added: 1.7.0
regenerate:
description:
- Allows to configure in which situations the module is allowed to regenerate private keys.
The module will always generate a new key if the destination file does not exist.
- By default, the key will be regenerated when it does not match the module's options,
except when the key cannot be read or the passphrase does not match. Please note that
this B(changed) for Ansible 2.10. For Ansible 2.9, the behavior was as if V(full_idempotence)
is specified.
- If set to V(never), the module will fail if the key cannot be read or the passphrase
is not matching, and will never regenerate an existing key.
- If set to V(fail), the module will fail if the key does not correspond to the module's
options.
- If set to V(partial_idempotence), the key will be regenerated if it does not conform to
the module's options. The key is B(not) regenerated if it cannot be read (broken file),
the key is protected by an unknown passphrase, or when they key is not protected by a
passphrase, but a passphrase is specified.
- If set to V(full_idempotence), the key will be regenerated if it does not conform to the
module's options. This is also the case if the key cannot be read (broken file), the key
is protected by an unknown passphrase, or when they key is not protected by a passphrase,
but a passphrase is specified. Make sure you have a B(backup) when using this option!
- If set to V(always), the module will always regenerate the key. This is equivalent to
setting O(force) to V(true).
- Note that adjusting the comment and the permissions can be changed without regeneration.
Therefore, even for V(never), the task can result in changed.
type: str
choices:
- never
- fail
- partial_idempotence
- full_idempotence
- always
default: partial_idempotence
version_added: '1.0.0'
notes:
- In case the ssh key is broken or password protected, the module will fail.
Set the O(force) option to V(true) if you want to regenerate the keypair.
- In the case a custom O(mode), O(group), O(owner), or other file attribute is provided it will be applied to both key files.
'''
EXAMPLES = '''
- name: Generate an OpenSSH keypair with the default values (4096 bits, rsa)
community.crypto.openssh_keypair:
path: /tmp/id_ssh_rsa
- name: Generate an OpenSSH keypair with the default values (4096 bits, rsa) and encrypted private key
community.crypto.openssh_keypair:
path: /tmp/id_ssh_rsa
passphrase: super_secret_password
- name: Generate an OpenSSH rsa keypair with a different size (2048 bits)
community.crypto.openssh_keypair:
path: /tmp/id_ssh_rsa
size: 2048
- name: Force regenerate an OpenSSH keypair if it already exists
community.crypto.openssh_keypair:
path: /tmp/id_ssh_rsa
force: true
- name: Generate an OpenSSH keypair with a different algorithm (dsa)
community.crypto.openssh_keypair:
path: /tmp/id_ssh_dsa
type: dsa
'''
RETURN = '''
size:
description: Size (in bits) of the SSH private key.
returned: changed or success
type: int
sample: 4096
type:
description: Algorithm used to generate the SSH private key.
returned: changed or success
type: str
sample: rsa
filename:
description: Path to the generated SSH private key file.
returned: changed or success
type: str
sample: /tmp/id_ssh_rsa
fingerprint:
description: The fingerprint of the key.
returned: changed or success
type: str
sample: SHA256:r4YCZxihVjedH2OlfjVGI6Y5xAYtdCwk8VxKyzVyYfM
public_key:
description: The public key of the generated SSH private key.
returned: changed or success
type: str
sample: ssh-rsa AAAAB3Nza(...omitted...)veL4E3Xcw==
comment:
description: The comment of the generated key.
returned: changed or success
type: str
sample: test@comment
'''
from ansible.module_utils.basic import AnsibleModule
from ansible_collections.community.crypto.plugins.module_utils.openssh.backends.keypair_backend import (
select_backend
)
def main():
module = AnsibleModule(
argument_spec=dict(
state=dict(type='str', default='present', choices=['present', 'absent']),
size=dict(type='int'),
type=dict(type='str', default='rsa', choices=['rsa', 'dsa', 'rsa1', 'ecdsa', 'ed25519']),
force=dict(type='bool', default=False),
path=dict(type='path', required=True),
comment=dict(type='str'),
regenerate=dict(
type='str',
default='partial_idempotence',
choices=['never', 'fail', 'partial_idempotence', 'full_idempotence', 'always']
),
passphrase=dict(type='str', no_log=True),
private_key_format=dict(
type='str',
default='auto',
no_log=False,
choices=['auto', 'pkcs1', 'pkcs8', 'ssh']),
backend=dict(type='str', default='auto', choices=['auto', 'cryptography', 'opensshbin'])
),
supports_check_mode=True,
add_file_common_args=True,
)
keypair = select_backend(module, module.params['backend'])[1]
keypair.execute()
if __name__ == '__main__':
main()