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community.general/plugins/modules/sudoers.py
adaniaud 49bd9cbd3c
Add noexec support to sudoers (#7983)
* Add noexec support to sudoers

* Add changelog fragment #7983

* Fix yml formatting in fragment 7983

* Apply suggestions from code review

Co-authored-by: Felix Fontein <felix@fontein.de>

---------

Co-authored-by: Felix Fontein <felix@fontein.de>
2024-02-23 06:36:45 +01:00

331 lines
8.8 KiB
Python

#!/usr/bin/python
# -*- coding: utf-8 -*-
# Copyright (c) 2019, Jon Ellis (@JonEllis) <ellis.jp@gmail.com>
# 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: sudoers
short_description: Manage sudoers files
version_added: "4.3.0"
description:
- This module allows for the manipulation of sudoers files.
author:
- "Jon Ellis (@JonEllis) <ellis.jp@gmail.com>"
extends_documentation_fragment:
- community.general.attributes
attributes:
check_mode:
support: full
diff_mode:
support: none
options:
commands:
description:
- The commands allowed by the sudoers rule.
- Multiple can be added by passing a list of commands.
- Use V(ALL) for all commands.
type: list
elements: str
group:
description:
- The name of the group for the sudoers rule.
- This option cannot be used in conjunction with O(user).
type: str
name:
required: true
description:
- The name of the sudoers rule.
- This will be used for the filename for the sudoers file managed by this rule.
type: str
noexec:
description:
- Whether a command is prevented to run further commands itself.
default: false
type: bool
version_added: 8.4.0
nopassword:
description:
- Whether a password will be required to run the sudo'd command.
default: true
type: bool
setenv:
description:
- Whether to allow keeping the environment when command is run with sudo.
default: false
type: bool
version_added: 6.3.0
host:
description:
- Specify the host the rule is for.
default: ALL
type: str
version_added: 6.2.0
runas:
description:
- Specify the target user the command(s) will run as.
type: str
version_added: 4.7.0
sudoers_path:
description:
- The path which sudoers config files will be managed in.
default: /etc/sudoers.d
type: str
state:
default: "present"
choices:
- present
- absent
description:
- Whether the rule should exist or not.
type: str
user:
description:
- The name of the user for the sudoers rule.
- This option cannot be used in conjunction with O(group).
type: str
validation:
description:
- If V(absent), the sudoers rule will be added without validation.
- If V(detect) and visudo is available, then the sudoers rule will be validated by visudo.
- If V(required), visudo must be available to validate the sudoers rule.
type: str
default: detect
choices: [ absent, detect, required ]
version_added: 5.2.0
'''
EXAMPLES = '''
- name: Allow the backup user to sudo /usr/local/bin/backup
community.general.sudoers:
name: allow-backup
state: present
user: backup
commands: /usr/local/bin/backup
- name: Allow the bob user to run any commands as alice with sudo -u alice
community.general.sudoers:
name: bob-do-as-alice
state: present
user: bob
runas: alice
commands: ALL
- name: >-
Allow the monitoring group to run sudo /usr/local/bin/gather-app-metrics
without requiring a password on the host called webserver
community.general.sudoers:
name: monitor-app
group: monitoring
host: webserver
commands: /usr/local/bin/gather-app-metrics
- name: >-
Allow the alice user to run sudo /bin/systemctl restart my-service or
sudo /bin/systemctl reload my-service, but a password is required
community.general.sudoers:
name: alice-service
user: alice
commands:
- /bin/systemctl restart my-service
- /bin/systemctl reload my-service
nopassword: false
- name: Revoke the previous sudo grants given to the alice user
community.general.sudoers:
name: alice-service
state: absent
- name: Allow alice to sudo /usr/local/bin/upload and keep env variables
community.general.sudoers:
name: allow-alice-upload
user: alice
commands: /usr/local/bin/upload
setenv: true
- name: >-
Allow alice to sudo /usr/bin/less but prevent less from
running further commands itself
community.general.sudoers:
name: allow-alice-restricted-less
user: alice
commands: /usr/bin/less
noexec: true
'''
import os
from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.common.text.converters import to_native
class Sudoers(object):
FILE_MODE = 0o440
def __init__(self, module):
self.module = module
self.check_mode = module.check_mode
self.name = module.params['name']
self.user = module.params['user']
self.group = module.params['group']
self.state = module.params['state']
self.noexec = module.params['noexec']
self.nopassword = module.params['nopassword']
self.setenv = module.params['setenv']
self.host = module.params['host']
self.runas = module.params['runas']
self.sudoers_path = module.params['sudoers_path']
self.file = os.path.join(self.sudoers_path, self.name)
self.commands = module.params['commands']
self.validation = module.params['validation']
def write(self):
if self.check_mode:
return
with open(self.file, 'w') as f:
f.write(self.content())
os.chmod(self.file, self.FILE_MODE)
def delete(self):
if self.check_mode:
return
os.remove(self.file)
def exists(self):
return os.path.exists(self.file)
def matches(self):
with open(self.file, 'r') as f:
content_matches = f.read() == self.content()
current_mode = os.stat(self.file).st_mode & 0o777
mode_matches = current_mode == self.FILE_MODE
return content_matches and mode_matches
def content(self):
if self.user:
owner = self.user
elif self.group:
owner = '%{group}'.format(group=self.group)
commands_str = ', '.join(self.commands)
noexec_str = 'NOEXEC:' if self.noexec else ''
nopasswd_str = 'NOPASSWD:' if self.nopassword else ''
setenv_str = 'SETENV:' if self.setenv else ''
runas_str = '({runas})'.format(runas=self.runas) if self.runas is not None else ''
return "{owner} {host}={runas}{noexec}{nopasswd}{setenv} {commands}\n".format(
owner=owner,
host=self.host,
runas=runas_str,
noexec=noexec_str,
nopasswd=nopasswd_str,
setenv=setenv_str,
commands=commands_str
)
def validate(self):
if self.validation == 'absent':
return
visudo_path = self.module.get_bin_path('visudo', required=self.validation == 'required')
if visudo_path is None:
return
check_command = [visudo_path, '-c', '-f', '-']
rc, stdout, stderr = self.module.run_command(check_command, data=self.content())
if rc != 0:
raise Exception('Failed to validate sudoers rule:\n{stdout}'.format(stdout=stdout))
def run(self):
if self.state == 'absent':
if self.exists():
self.delete()
return True
else:
return False
self.validate()
if self.exists() and self.matches():
return False
self.write()
return True
def main():
argument_spec = {
'commands': {
'type': 'list',
'elements': 'str',
},
'group': {},
'name': {
'required': True,
},
'noexec': {
'type': 'bool',
'default': False,
},
'nopassword': {
'type': 'bool',
'default': True,
},
'setenv': {
'type': 'bool',
'default': False,
},
'host': {
'type': 'str',
'default': 'ALL',
},
'runas': {
'type': 'str',
'default': None,
},
'sudoers_path': {
'type': 'str',
'default': '/etc/sudoers.d',
},
'state': {
'default': 'present',
'choices': ['present', 'absent'],
},
'user': {},
'validation': {
'default': 'detect',
'choices': ['absent', 'detect', 'required']
},
}
module = AnsibleModule(
argument_spec=argument_spec,
mutually_exclusive=[['user', 'group']],
supports_check_mode=True,
required_if=[('state', 'present', ['commands'])],
)
sudoers = Sudoers(module)
try:
changed = sudoers.run()
module.exit_json(changed=changed)
except Exception as e:
module.fail_json(msg=to_native(e))
if __name__ == '__main__':
main()