community.general/plugins/become/machinectl.py

# -*- coding: utf-8 -*-
# Copyright: (c) 2018, Ansible Project
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type

DOCUMENTATION = '''
    name: machinectl
    short_description: Systemd's machinectl privilege escalation
    description:
        - This become plugins allows your remote/login user to execute commands as another user via the machinectl utility.
    author: Ansible Core Team
    options:
        become_user:
            description: User you 'become' to execute the task
            default: ''
            ini:
              - section: privilege_escalation
                key: become_user
              - section: machinectl_become_plugin
                key: user
            vars:
              - name: ansible_become_user
              - name: ansible_machinectl_user
            env:
              - name: ANSIBLE_BECOME_USER
              - name: ANSIBLE_MACHINECTL_USER
        become_exe:
            description: Machinectl executable
            default: machinectl
            ini:
              - section: privilege_escalation
                key: become_exe
              - section: machinectl_become_plugin
                key: executable
            vars:
              - name: ansible_become_exe
              - name: ansible_machinectl_exe
            env:
              - name: ANSIBLE_BECOME_EXE
              - name: ANSIBLE_MACHINECTL_EXE
        become_flags:
            description: Options to pass to machinectl
            default: ''
            ini:
              - section: privilege_escalation
                key: become_flags
              - section: machinectl_become_plugin
                key: flags
            vars:
              - name: ansible_become_flags
              - name: ansible_machinectl_flags
            env:
              - name: ANSIBLE_BECOME_FLAGS
              - name: ANSIBLE_MACHINECTL_FLAGS
        become_pass:
            description: Password for machinectl
            required: False
            vars:
              - name: ansible_become_password
              - name: ansible_become_pass
              - name: ansible_machinectl_pass
            env:
              - name: ANSIBLE_BECOME_PASS
              - name: ANSIBLE_MACHINECTL_PASS
            ini:
              - section: machinectl_become_plugin
                key: password
    notes:
      - When not using this plugin with user C(root), it only works correctly with a polkit rule which will alter
        the behaviour of machinectl. This rule must alter the prompt behaviour to ask directly for the user credentials,
        if the user is allowed to perform the action (take a look at the examples section).
        If such a rule is not present the plugin only work if it is used in context with the root user,
        because then no further prompt will be shown by machinectl.
'''

EXAMPLES = r'''
# A polkit rule needed to use the module with a non-root user.
# See the Notes section for details.
60-machinectl-fast-user-auth.rules: |
    polkit.addRule(function(action, subject) {
        if(action.id == "org.freedesktop.machine1.host-shell" && subject.isInGroup("wheel")) {
            return polkit.Result.AUTH_SELF_KEEP;
        }
    });
'''

from re import compile as re_compile

from ansible.plugins.become import BecomeBase
from ansible.module_utils._text import to_bytes


ansi_color_codes = re_compile(to_bytes(r'\x1B\[[0-9;]+m'))


class BecomeModule(BecomeBase):

    name = 'community.general.machinectl'

    prompt = 'Password: '
    fail = ('==== AUTHENTICATION FAILED ====',)
    success = ('==== AUTHENTICATION COMPLETE ====',)

    @staticmethod
    def remove_ansi_codes(line):
        return ansi_color_codes.sub(b"", line)

    def build_become_command(self, cmd, shell):
        super(BecomeModule, self).build_become_command(cmd, shell)

        if not cmd:
            return cmd

        become = self.get_option('become_exe')

        flags = self.get_option('become_flags')
        user = self.get_option('become_user')
        return '%s -q shell %s %s@ %s' % (become, flags, user, cmd)

    def check_success(self, b_output):
        b_output = self.remove_ansi_codes(b_output)
        return super().check_success(b_output)

    def check_incorrect_password(self, b_output):
        b_output = self.remove_ansi_codes(b_output)
        return super().check_incorrect_password(b_output)

    def check_missing_password(self, b_output):
        b_output = self.remove_ansi_codes(b_output)
        return super().check_missing_password(b_output)