# -*- coding: utf-8 -*-
# Based on local.py by Michael DeHaan <michael.dehaan@gmail.com>
# and chroot.py by Maykel Moya <mmoya@speedyrails.com>
# Copyright (c) 2013, Michael Scherer <misc@zarb.org>
# Copyright (c) 2015, Toshio Kuratomi <tkuratomi@ansible.com>
# Copyright (c) 2017 Ansible Project
# 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 = '''
author: Ansible Core Team
name: jail
short_description: Run tasks in jails
description:
- Run commands or put/fetch files to an existing jail
options:
remote_addr:
description:
- Path to the jail
default: inventory_hostname
vars:
- name: inventory_hostname
- name: ansible_host
- name: ansible_jail_host
remote_user:
description:
- User to execute as inside the jail
vars:
- name: ansible_user
- name: ansible_jail_user
'''
import os
import os.path
import subprocess
import traceback
from ansible.errors import AnsibleError
from ansible.module_utils.six.moves import shlex_quote
from ansible.module_utils.common.process import get_bin_path
from ansible.module_utils.common.text.converters import to_bytes, to_native, to_text
from ansible.plugins.connection import ConnectionBase, BUFSIZE
from ansible.utils.display import Display
display = Display()
class Connection(ConnectionBase):
""" Local BSD Jail based connections """
modified_jailname_key = 'conn_jail_name'
transport = 'community.general.jail'
# Pipelining may work. Someone needs to test by setting this to True and
# having pipelining=True in their ansible.cfg
has_pipelining = True
has_tty = False
def __init__(self, play_context, new_stdin, *args, **kwargs):
super(Connection, self).__init__(play_context, new_stdin, *args, **kwargs)
self.jail = self._play_context.remote_addr
if self.modified_jailname_key in kwargs:
self.jail = kwargs[self.modified_jailname_key]
if os.geteuid() != 0:
raise AnsibleError("jail connection requires running as root")
self.jls_cmd = self._search_executable('jls')
self.jexec_cmd = self._search_executable('jexec')
if self.jail not in self.list_jails():
raise AnsibleError("incorrect jail name %s" % self.jail)
@staticmethod
def _search_executable(executable):
try:
return get_bin_path(executable)
except ValueError:
raise AnsibleError("%s command not found in PATH" % executable)
def list_jails(self):
p = subprocess.Popen([self.jls_cmd, '-q', 'name'],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
stdout, stderr = p.communicate()
return to_text(stdout, errors='surrogate_or_strict').split()
def _connect(self):
""" connect to the jail; nothing to do here """
super(Connection, self)._connect()
if not self._connected:
display.vvv(u"ESTABLISH JAIL CONNECTION FOR USER: {0}".format(self._play_context.remote_user), host=self.jail)
self._connected = True
def _buffered_exec_command(self, cmd, stdin=subprocess.PIPE):
""" run a command on the jail. This is only needed for implementing
put_file() get_file() so that we don't have to read the whole file
into memory.
compared to exec_command() it looses some niceties like being able to
return the process's exit code immediately.
"""
local_cmd = [self.jexec_cmd]
set_env = ''
if self._play_context.remote_user is not None:
local_cmd += ['-U', self._play_context.remote_user]
# update HOME since -U does not update the jail environment
set_env = 'HOME=~' + self._play_context.remote_user + ' '
local_cmd += [self.jail, self._play_context.executable, '-c', set_env + cmd]
display.vvv("EXEC %s" % (local_cmd,), host=self.jail)
local_cmd = [to_bytes(i, errors='surrogate_or_strict') for i in local_cmd]
p = subprocess.Popen(local_cmd, shell=False, stdin=stdin,
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
return p
def exec_command(self, cmd, in_data=None, sudoable=False):
""" run a command on the jail """
super(Connection, self).exec_command(cmd, in_data=in_data, sudoable=sudoable)
p = self._buffered_exec_command(cmd)
stdout, stderr = p.communicate(in_data)
return p.returncode, stdout, stderr
@staticmethod
def _prefix_login_path(remote_path):
""" Make sure that we put files into a standard path
If a path is relative, then we need to choose where to put it.
ssh chooses $HOME but we aren't guaranteed that a home dir will
exist in any given chroot. So for now we're choosing "/" instead.
This also happens to be the former default.
Can revisit using $HOME instead if it's a problem
"""
if not remote_path.startswith(os.path.sep):
remote_path = os.path.join(os.path.sep, remote_path)
return os.path.normpath(remote_path)
def put_file(self, in_path, out_path):
""" transfer a file from local to jail """
super(Connection, self).put_file(in_path, out_path)
display.vvv("PUT %s TO %s" % (in_path, out_path), host=self.jail)
out_path = shlex_quote(self._prefix_login_path(out_path))
try:
with open(to_bytes(in_path, errors='surrogate_or_strict'), 'rb') as in_file:
if not os.fstat(in_file.fileno()).st_size:
count = ' count=0'
else:
count = ''
try:
p = self._buffered_exec_command('dd of=%s bs=%s%s' % (out_path, BUFSIZE, count), stdin=in_file)
except OSError:
raise AnsibleError("jail connection requires dd command in the jail")
try:
stdout, stderr = p.communicate()
except Exception:
traceback.print_exc()
raise AnsibleError("failed to transfer file %s to %s" % (in_path, out_path))
if p.returncode != 0:
raise AnsibleError("failed to transfer file %s to %s:\n%s\n%s" % (in_path, out_path, to_native(stdout), to_native(stderr)))
except IOError:
raise AnsibleError("file or module does not exist at: %s" % in_path)
def fetch_file(self, in_path, out_path):
""" fetch a file from jail to local """
super(Connection, self).fetch_file(in_path, out_path)
display.vvv("FETCH %s TO %s" % (in_path, out_path), host=self.jail)
in_path = shlex_quote(self._prefix_login_path(in_path))
try:
p = self._buffered_exec_command('dd if=%s bs=%s' % (in_path, BUFSIZE))
except OSError:
raise AnsibleError("jail connection requires dd command in the jail")
with open(to_bytes(out_path, errors='surrogate_or_strict'), 'wb+') as out_file:
try:
chunk = p.stdout.read(BUFSIZE)
while chunk:
out_file.write(chunk)
chunk = p.stdout.read(BUFSIZE)
except Exception:
traceback.print_exc()
raise AnsibleError("failed to transfer file %s to %s" % (in_path, out_path))
stdout, stderr = p.communicate()
if p.returncode != 0:
raise AnsibleError("failed to transfer file %s to %s:\n%s\n%s" % (in_path, out_path, to_native(stdout), to_native(stderr)))
def close(self):
""" terminate the connection; nothing to do here """
super(Connection, self).close()
self._connected = False