202 lines
7.9 KiB
Python
202 lines
7.9 KiB
Python
# -*- coding: utf-8 -*-
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# Based on local.py by Michael DeHaan <michael.dehaan@gmail.com>
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# and chroot.py by Maykel Moya <mmoya@speedyrails.com>
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# Copyright (c) 2013, Michael Scherer <misc@zarb.org>
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# Copyright (c) 2015, Toshio Kuratomi <tkuratomi@ansible.com>
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# Copyright (c) 2017 Ansible Project
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# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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DOCUMENTATION = '''
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author: Ansible Core Team
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name: jail
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short_description: Run tasks in jails
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description:
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- Run commands or put/fetch files to an existing jail
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options:
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remote_addr:
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description:
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- Path to the jail
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default: inventory_hostname
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vars:
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- name: ansible_host
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- name: ansible_jail_host
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remote_user:
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description:
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- User to execute as inside the jail
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vars:
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- name: ansible_user
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- name: ansible_jail_user
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'''
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import os
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import os.path
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import subprocess
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import traceback
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from ansible.errors import AnsibleError
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from ansible.module_utils.six.moves import shlex_quote
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from ansible.module_utils.common.process import get_bin_path
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from ansible.module_utils.common.text.converters import to_bytes, to_native, to_text
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from ansible.plugins.connection import ConnectionBase, BUFSIZE
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from ansible.utils.display import Display
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display = Display()
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class Connection(ConnectionBase):
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""" Local BSD Jail based connections """
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modified_jailname_key = 'conn_jail_name'
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transport = 'community.general.jail'
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# Pipelining may work. Someone needs to test by setting this to True and
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# having pipelining=True in their ansible.cfg
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has_pipelining = True
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has_tty = False
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def __init__(self, play_context, new_stdin, *args, **kwargs):
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super(Connection, self).__init__(play_context, new_stdin, *args, **kwargs)
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self.jail = self._play_context.remote_addr
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if self.modified_jailname_key in kwargs:
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self.jail = kwargs[self.modified_jailname_key]
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if os.geteuid() != 0:
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raise AnsibleError("jail connection requires running as root")
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self.jls_cmd = self._search_executable('jls')
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self.jexec_cmd = self._search_executable('jexec')
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if self.jail not in self.list_jails():
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raise AnsibleError("incorrect jail name %s" % self.jail)
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@staticmethod
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def _search_executable(executable):
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try:
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return get_bin_path(executable)
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except ValueError:
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raise AnsibleError("%s command not found in PATH" % executable)
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def list_jails(self):
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p = subprocess.Popen([self.jls_cmd, '-q', 'name'],
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stdin=subprocess.PIPE,
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stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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stdout, stderr = p.communicate()
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return to_text(stdout, errors='surrogate_or_strict').split()
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def _connect(self):
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""" connect to the jail; nothing to do here """
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super(Connection, self)._connect()
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if not self._connected:
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display.vvv(u"ESTABLISH JAIL CONNECTION FOR USER: {0}".format(self._play_context.remote_user), host=self.jail)
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self._connected = True
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def _buffered_exec_command(self, cmd, stdin=subprocess.PIPE):
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""" run a command on the jail. This is only needed for implementing
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put_file() get_file() so that we don't have to read the whole file
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into memory.
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compared to exec_command() it looses some niceties like being able to
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return the process's exit code immediately.
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"""
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local_cmd = [self.jexec_cmd]
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set_env = ''
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if self._play_context.remote_user is not None:
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local_cmd += ['-U', self._play_context.remote_user]
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# update HOME since -U does not update the jail environment
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set_env = 'HOME=~' + self._play_context.remote_user + ' '
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local_cmd += [self.jail, self._play_context.executable, '-c', set_env + cmd]
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display.vvv("EXEC %s" % (local_cmd,), host=self.jail)
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local_cmd = [to_bytes(i, errors='surrogate_or_strict') for i in local_cmd]
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p = subprocess.Popen(local_cmd, shell=False, stdin=stdin,
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stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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return p
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def exec_command(self, cmd, in_data=None, sudoable=False):
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""" run a command on the jail """
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super(Connection, self).exec_command(cmd, in_data=in_data, sudoable=sudoable)
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p = self._buffered_exec_command(cmd)
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stdout, stderr = p.communicate(in_data)
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return p.returncode, stdout, stderr
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@staticmethod
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def _prefix_login_path(remote_path):
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""" Make sure that we put files into a standard path
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If a path is relative, then we need to choose where to put it.
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ssh chooses $HOME but we aren't guaranteed that a home dir will
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exist in any given chroot. So for now we're choosing "/" instead.
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This also happens to be the former default.
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Can revisit using $HOME instead if it's a problem
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"""
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if not remote_path.startswith(os.path.sep):
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remote_path = os.path.join(os.path.sep, remote_path)
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return os.path.normpath(remote_path)
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def put_file(self, in_path, out_path):
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""" transfer a file from local to jail """
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super(Connection, self).put_file(in_path, out_path)
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display.vvv("PUT %s TO %s" % (in_path, out_path), host=self.jail)
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out_path = shlex_quote(self._prefix_login_path(out_path))
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try:
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with open(to_bytes(in_path, errors='surrogate_or_strict'), 'rb') as in_file:
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if not os.fstat(in_file.fileno()).st_size:
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count = ' count=0'
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else:
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count = ''
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try:
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p = self._buffered_exec_command('dd of=%s bs=%s%s' % (out_path, BUFSIZE, count), stdin=in_file)
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except OSError:
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raise AnsibleError("jail connection requires dd command in the jail")
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try:
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stdout, stderr = p.communicate()
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except Exception:
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traceback.print_exc()
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raise AnsibleError("failed to transfer file %s to %s" % (in_path, out_path))
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if p.returncode != 0:
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raise AnsibleError("failed to transfer file %s to %s:\n%s\n%s" % (in_path, out_path, to_native(stdout), to_native(stderr)))
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except IOError:
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raise AnsibleError("file or module does not exist at: %s" % in_path)
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def fetch_file(self, in_path, out_path):
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""" fetch a file from jail to local """
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super(Connection, self).fetch_file(in_path, out_path)
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display.vvv("FETCH %s TO %s" % (in_path, out_path), host=self.jail)
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in_path = shlex_quote(self._prefix_login_path(in_path))
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try:
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p = self._buffered_exec_command('dd if=%s bs=%s' % (in_path, BUFSIZE))
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except OSError:
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raise AnsibleError("jail connection requires dd command in the jail")
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with open(to_bytes(out_path, errors='surrogate_or_strict'), 'wb+') as out_file:
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try:
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chunk = p.stdout.read(BUFSIZE)
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while chunk:
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out_file.write(chunk)
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chunk = p.stdout.read(BUFSIZE)
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except Exception:
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traceback.print_exc()
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raise AnsibleError("failed to transfer file %s to %s" % (in_path, out_path))
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stdout, stderr = p.communicate()
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if p.returncode != 0:
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raise AnsibleError("failed to transfer file %s to %s:\n%s\n%s" % (in_path, out_path, to_native(stdout), to_native(stderr)))
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def close(self):
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""" terminate the connection; nothing to do here """
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super(Connection, self).close()
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self._connected = False
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