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mitogen/ansible_mitogen/transport_config.py

789 lines
26 KiB
Python

# Copyright 2019, David Wilson
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# 3. Neither the name of the copyright holder nor the names of its contributors
# may be used to endorse or promote products derived from this software without
# specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
from __future__ import absolute_import
from __future__ import unicode_literals
"""
Mitogen extends Ansible's target configuration mechanism in several ways that
require some care:
* Per-task configurables in Ansible like ansible_python_interpreter are
connection-layer configurables in Mitogen. They must be extracted during each
task execution to form the complete connection-layer configuration.
* Mitogen has extra configurables not supported by Ansible at all, such as
mitogen_ssh_debug_level. These are extracted the same way as
ansible_python_interpreter.
* Mitogen allows connections to be delegated to other machines. Ansible has no
internal framework for this, and so Mitogen must figure out a delegated
connection configuration all on its own. It cannot reuse much of the Ansible
machinery for building a connection configuration, as that machinery is
deeply spread out and hard-wired to expect Ansible's usual mode of operation.
For normal and delegate_to connections, Ansible's PlayContext is reused where
possible to maximize compatibility, but for proxy hops, configurations are
built up using the HostVars magic class to call VariableManager.get_vars()
behind the scenes on our behalf. Where Ansible has multiple sources of a
configuration item, for example, ansible_ssh_extra_args, Mitogen must (ideally
perfectly) reproduce how Ansible arrives at its value, without using mechanisms
that are hard-wired or change across Ansible versions.
That is what this file is for. It exports two spec classes, one that takes all
information from PlayContext, and another that takes (almost) all information
from HostVars.
"""
import abc
import os
import ansible.utils.shlex
import ansible.constants as C
from ansible.module_utils.six import with_metaclass
# this was added in Ansible >= 2.8.0; fallback to the default interpreter if necessary
try:
from ansible.executor.interpreter_discovery import discover_interpreter
except ImportError:
discover_interpreter = lambda action,interpreter_name,discovery_mode,task_vars: '/usr/bin/python'
try:
from ansible.utils.unsafe_proxy import AnsibleUnsafeText
except ImportError:
from ansible.vars.unsafe_proxy import AnsibleUnsafeText
import mitogen.core
def run_interpreter_discovery_if_necessary(s, task_vars, action, rediscover_python):
"""
Triggers ansible python interpreter discovery if requested.
Caches this value the same way Ansible does it.
For connections like `docker`, we want to rediscover the python interpreter because
it could be different than what's ran on the host
"""
# keep trying different interpreters until we don't error
if action._finding_python_interpreter:
return action._possible_python_interpreter
if s in ['auto', 'auto_legacy', 'auto_silent', 'auto_legacy_silent']:
# python is the only supported interpreter_name as of Ansible 2.8.8
interpreter_name = 'python'
discovered_interpreter_config = u'discovered_interpreter_%s' % interpreter_name
if task_vars.get('ansible_facts') is None:
task_vars['ansible_facts'] = {}
if rediscover_python and task_vars.get('ansible_facts', {}).get(discovered_interpreter_config):
# if we're rediscovering python then chances are we're running something like a docker connection
# this will handle scenarios like running a playbook that does stuff + then dynamically creates a docker container,
# then runs the rest of the playbook inside that container, and then rerunning the playbook again
action._rediscovered_python = True
# blow away the discovered_interpreter_config cache and rediscover
del task_vars['ansible_facts'][discovered_interpreter_config]
if discovered_interpreter_config not in task_vars['ansible_facts']:
action._finding_python_interpreter = True
# fake pipelining so discover_interpreter can be happy
action._connection.has_pipelining = True
s = AnsibleUnsafeText(discover_interpreter(
action=action,
interpreter_name=interpreter_name,
discovery_mode=s,
task_vars=task_vars))
# cache discovered interpreter
task_vars['ansible_facts'][discovered_interpreter_config] = s
action._connection.has_pipelining = False
else:
s = task_vars['ansible_facts'][discovered_interpreter_config]
# propagate discovered interpreter as fact
action._discovered_interpreter_key = discovered_interpreter_config
action._discovered_interpreter = s
action._finding_python_interpreter = False
return s
def parse_python_path(s, task_vars, action, rediscover_python):
"""
Given the string set for ansible_python_interpeter, parse it using shell
syntax and return an appropriate argument vector. If the value detected is
one of interpreter discovery then run that first. Caches python interpreter
discovery value in `facts_from_task_vars` like how Ansible handles this.
"""
if not s:
# if python_path doesn't exist, default to `auto` and attempt to discover it
s = 'auto'
s = run_interpreter_discovery_if_necessary(s, task_vars, action, rediscover_python)
# if unable to determine python_path, fallback to '/usr/bin/python'
if not s:
s = '/usr/bin/python'
return ansible.utils.shlex.shlex_split(s)
def optional_secret(value):
"""
Wrap `value` in :class:`mitogen.core.Secret` if it is not :data:`None`,
otherwise return :data:`None`.
"""
if value is not None:
return mitogen.core.Secret(value)
def first_true(it, default=None):
"""
Return the first truthy element from `it`.
"""
for elem in it:
if elem:
return elem
return default
class Spec(with_metaclass(abc.ABCMeta, object)):
"""
A source for variables that comprise a connection configuration.
"""
@abc.abstractmethod
def transport(self):
"""
The name of the Ansible plug-in implementing the connection.
"""
@abc.abstractmethod
def inventory_name(self):
"""
The name of the target being connected to as it appears in Ansible's
inventory.
"""
@abc.abstractmethod
def remote_addr(self):
"""
The network address of the target, or for container and other special
targets, some other unique identifier.
"""
@abc.abstractmethod
def remote_user(self):
"""
The username of the login account on the target.
"""
@abc.abstractmethod
def password(self):
"""
The password of the login account on the target.
"""
@abc.abstractmethod
def become(self):
"""
:data:`True` if privilege escalation should be active.
"""
@abc.abstractmethod
def become_method(self):
"""
The name of the Ansible become method to use.
"""
@abc.abstractmethod
def become_user(self):
"""
The username of the target account for become.
"""
@abc.abstractmethod
def become_pass(self):
"""
The password of the target account for become.
"""
@abc.abstractmethod
def port(self):
"""
The port of the login service on the target machine.
"""
@abc.abstractmethod
def python_path(self):
"""
Path to the Python interpreter on the target machine.
"""
@abc.abstractmethod
def private_key_file(self):
"""
Path to the SSH private key file to use to login.
"""
@abc.abstractmethod
def ssh_executable(self):
"""
Path to the SSH executable.
"""
@abc.abstractmethod
def timeout(self):
"""
The generic timeout for all connections.
"""
@abc.abstractmethod
def ansible_ssh_timeout(self):
"""
The SSH-specific timeout for a connection.
"""
@abc.abstractmethod
def ssh_args(self):
"""
The list of additional arguments that should be included in an SSH
invocation.
"""
@abc.abstractmethod
def become_exe(self):
"""
The path to the executable implementing the become method on the remote
machine.
"""
@abc.abstractmethod
def sudo_args(self):
"""
The list of additional arguments that should be included in a become
invocation.
"""
# TODO: split out into sudo_args/become_args.
@abc.abstractmethod
def mitogen_via(self):
"""
The value of the mitogen_via= variable for this connection. Indicates
the connection should be established via an intermediary.
"""
@abc.abstractmethod
def mitogen_kind(self):
"""
The type of container to use with the "setns" transport.
"""
@abc.abstractmethod
def mitogen_mask_remote_name(self):
"""
Specifies whether to set a fixed "remote_name" field. The remote_name
is the suffix of `argv[0]` for remote interpreters. By default it
includes identifying information from the local process, which may be
undesirable in some circumstances.
"""
@abc.abstractmethod
def mitogen_buildah_path(self):
"""
The path to the "buildah" program for the 'buildah' transport.
"""
@abc.abstractmethod
def mitogen_docker_path(self):
"""
The path to the "docker" program for the 'docker' transport.
"""
@abc.abstractmethod
def mitogen_kubectl_path(self):
"""
The path to the "kubectl" program for the 'docker' transport.
"""
@abc.abstractmethod
def mitogen_lxc_path(self):
"""
The path to the "lxc" program for the 'lxd' transport.
"""
@abc.abstractmethod
def mitogen_lxc_attach_path(self):
"""
The path to the "lxc-attach" program for the 'lxc' transport.
"""
@abc.abstractmethod
def mitogen_lxc_info_path(self):
"""
The path to the "lxc-info" program for the 'lxc' transport.
"""
@abc.abstractmethod
def mitogen_machinectl_path(self):
"""
The path to the "machinectl" program for the 'setns' transport.
"""
@abc.abstractmethod
def mitogen_ssh_keepalive_interval(self):
"""
The SSH ServerAliveInterval.
"""
@abc.abstractmethod
def mitogen_ssh_keepalive_count(self):
"""
The SSH ServerAliveCount.
"""
@abc.abstractmethod
def mitogen_ssh_debug_level(self):
"""
The SSH debug level.
"""
@abc.abstractmethod
def mitogen_ssh_compression(self):
"""
Whether SSH compression is enabled.
"""
@abc.abstractmethod
def extra_args(self):
"""
Connection-specific arguments.
"""
@abc.abstractmethod
def ansible_doas_exe(self):
"""
Value of "ansible_doas_exe" variable.
"""
class PlayContextSpec(Spec):
"""
PlayContextSpec takes almost all its information as-is from Ansible's
PlayContext. It is used for normal connections and delegate_to connections,
and should always be accurate.
"""
def __init__(self, connection, play_context, transport, inventory_name):
self._connection = connection
self._play_context = play_context
self._transport = transport
self._inventory_name = inventory_name
self._task_vars = self._connection._get_task_vars()
# used to run interpreter discovery
self._action = connection._action
def transport(self):
return self._transport
def inventory_name(self):
return self._inventory_name
def remote_addr(self):
return self._play_context.remote_addr
def remote_user(self):
return self._play_context.remote_user
def become(self):
return self._play_context.become
def become_method(self):
return self._play_context.become_method
def become_user(self):
return self._play_context.become_user
def become_pass(self):
return optional_secret(self._play_context.become_pass)
def password(self):
return optional_secret(self._play_context.password)
def port(self):
return self._play_context.port
def python_path(self, rediscover_python=False):
s = self._connection.get_task_var('ansible_python_interpreter')
# #511, #536: executor/module_common.py::_get_shebang() hard-wires
# "/usr/bin/python" as the default interpreter path if no other
# interpreter is specified.
return parse_python_path(
s,
task_vars=self._task_vars,
action=self._action,
rediscover_python=rediscover_python)
def private_key_file(self):
return self._play_context.private_key_file
def ssh_executable(self):
return self._play_context.ssh_executable
def timeout(self):
return self._play_context.timeout
def ansible_ssh_timeout(self):
return (
self._connection.get_task_var('ansible_timeout') or
self._connection.get_task_var('ansible_ssh_timeout') or
self.timeout()
)
def ssh_args(self):
return [
mitogen.core.to_text(term)
for s in (
getattr(self._play_context, 'ssh_args', ''),
getattr(self._play_context, 'ssh_common_args', ''),
getattr(self._play_context, 'ssh_extra_args', '')
)
for term in ansible.utils.shlex.shlex_split(s or '')
]
def become_exe(self):
# In Ansible 2.8, PlayContext.become_exe always has a default value due
# to the new options mechanism. Previously it was only set if a value
# ("somewhere") had been specified for the task.
# For consistency in the tests, here we make older Ansibles behave like
# newer Ansibles.
exe = self._play_context.become_exe
if exe is None and self._play_context.become_method == 'sudo':
exe = 'sudo'
return exe
def sudo_args(self):
return [
mitogen.core.to_text(term)
for term in ansible.utils.shlex.shlex_split(
first_true((
self._play_context.become_flags,
# Ansible <=2.7.
getattr(self._play_context, 'sudo_flags', ''),
# Ansible <=2.3.
getattr(C, 'DEFAULT_BECOME_FLAGS', ''),
getattr(C, 'DEFAULT_SUDO_FLAGS', '')
), default='')
)
]
def mitogen_via(self):
return self._connection.get_task_var('mitogen_via')
def mitogen_kind(self):
return self._connection.get_task_var('mitogen_kind')
def mitogen_mask_remote_name(self):
return self._connection.get_task_var('mitogen_mask_remote_name')
def mitogen_buildah_path(self):
return self._connection.get_task_var('mitogen_buildah_path')
def mitogen_docker_path(self):
return self._connection.get_task_var('mitogen_docker_path')
def mitogen_kubectl_path(self):
return self._connection.get_task_var('mitogen_kubectl_path')
def mitogen_lxc_path(self):
return self._connection.get_task_var('mitogen_lxc_path')
def mitogen_lxc_attach_path(self):
return self._connection.get_task_var('mitogen_lxc_attach_path')
def mitogen_lxc_info_path(self):
return self._connection.get_task_var('mitogen_lxc_info_path')
def mitogen_ssh_keepalive_interval(self):
return self._connection.get_task_var('mitogen_ssh_keepalive_interval')
def mitogen_ssh_keepalive_count(self):
return self._connection.get_task_var('mitogen_ssh_keepalive_count')
def mitogen_machinectl_path(self):
return self._connection.get_task_var('mitogen_machinectl_path')
def mitogen_ssh_debug_level(self):
return self._connection.get_task_var('mitogen_ssh_debug_level')
def mitogen_ssh_compression(self):
return self._connection.get_task_var('mitogen_ssh_compression')
def extra_args(self):
return self._connection.get_extra_args()
def ansible_doas_exe(self):
return (
self._connection.get_task_var('ansible_doas_exe') or
os.environ.get('ANSIBLE_DOAS_EXE')
)
class MitogenViaSpec(Spec):
"""
MitogenViaSpec takes most of its information from the HostVars of the
running task. HostVars is a lightweight wrapper around VariableManager, so
it is better to say that VariableManager.get_vars() is the ultimate source
of MitogenViaSpec's information.
Due to this, mitogen_via= hosts must have all their configuration
information represented as host and group variables. We cannot use any
per-task configuration, as all that data belongs to the real target host.
Ansible uses all kinds of strange historical logic for calculating
variables, including making their precedence configurable. MitogenViaSpec
must ultimately reimplement all of that logic. It is likely that if you are
having a configruation problem with connection delegation, the answer to
your problem lies in the method implementations below!
"""
def __init__(self, inventory_name, host_vars, task_vars, become_method, become_user,
play_context, action):
"""
:param str inventory_name:
The inventory name of the intermediary machine, i.e. not the target
machine.
:param dict host_vars:
The HostVars magic dictionary provided by Ansible in task_vars.
:param dict task_vars:
Task vars provided by Ansible.
:param str become_method:
If the mitogen_via= spec included a become method, the method it
specifies.
:param str become_user:
If the mitogen_via= spec included a become user, the user it
specifies.
:param PlayContext play_context:
For some global values **only**, the PlayContext used to describe
the real target machine. Values from this object are **strictly
restricted** to values that are Ansible-global, e.g. the passwords
specified interactively.
:param ActionModuleMixin action:
Backref to the ActionModuleMixin required for ansible interpreter discovery
"""
self._inventory_name = inventory_name
self._host_vars = host_vars
self._task_vars = task_vars
self._become_method = become_method
self._become_user = become_user
# Dangerous! You may find a variable you want in this object, but it's
# almost certainly for the wrong machine!
self._dangerous_play_context = play_context
self._action = action
def transport(self):
return (
self._host_vars.get('ansible_connection') or
C.DEFAULT_TRANSPORT
)
def inventory_name(self):
return self._inventory_name
def remote_addr(self):
# play_context.py::MAGIC_VARIABLE_MAPPING
return (
self._host_vars.get('ansible_ssh_host') or
self._host_vars.get('ansible_host') or
self._inventory_name
)
def remote_user(self):
return (
self._host_vars.get('ansible_ssh_user') or
self._host_vars.get('ansible_user') or
C.DEFAULT_REMOTE_USER
)
def become(self):
return bool(self._become_user)
def become_method(self):
return (
self._become_method or
self._host_vars.get('ansible_become_method') or
C.DEFAULT_BECOME_METHOD
)
def become_user(self):
return self._become_user
def become_pass(self):
return optional_secret(
self._host_vars.get('ansible_become_password') or
self._host_vars.get('ansible_become_pass')
)
def password(self):
return optional_secret(
self._host_vars.get('ansible_ssh_pass') or
self._host_vars.get('ansible_password')
)
def port(self):
return (
self._host_vars.get('ansible_ssh_port') or
self._host_vars.get('ansible_port') or
C.DEFAULT_REMOTE_PORT
)
def python_path(self, rediscover_python=False):
s = self._host_vars.get('ansible_python_interpreter')
# #511, #536: executor/module_common.py::_get_shebang() hard-wires
# "/usr/bin/python" as the default interpreter path if no other
# interpreter is specified.
return parse_python_path(
s,
task_vars=self._task_vars,
action=self._action,
rediscover_python=rediscover_python)
def private_key_file(self):
# TODO: must come from PlayContext too.
return (
self._host_vars.get('ansible_ssh_private_key_file') or
self._host_vars.get('ansible_private_key_file') or
C.DEFAULT_PRIVATE_KEY_FILE
)
def ssh_executable(self):
return (
self._host_vars.get('ansible_ssh_executable') or
C.ANSIBLE_SSH_EXECUTABLE
)
def timeout(self):
# TODO: must come from PlayContext too.
return C.DEFAULT_TIMEOUT
def ansible_ssh_timeout(self):
return (
self._host_vars.get('ansible_timeout') or
self._host_vars.get('ansible_ssh_timeout') or
self.timeout()
)
def ssh_args(self):
return [
mitogen.core.to_text(term)
for s in (
(
self._host_vars.get('ansible_ssh_args') or
getattr(C, 'ANSIBLE_SSH_ARGS', None) or
os.environ.get('ANSIBLE_SSH_ARGS')
# TODO: ini entry. older versions.
),
(
self._host_vars.get('ansible_ssh_common_args') or
os.environ.get('ANSIBLE_SSH_COMMON_ARGS')
# TODO: ini entry.
),
(
self._host_vars.get('ansible_ssh_extra_args') or
os.environ.get('ANSIBLE_SSH_EXTRA_ARGS')
# TODO: ini entry.
),
)
for term in ansible.utils.shlex.shlex_split(s)
if s
]
def become_exe(self):
return (
self._host_vars.get('ansible_become_exe') or
C.DEFAULT_BECOME_EXE
)
def sudo_args(self):
return [
mitogen.core.to_text(term)
for s in (
self._host_vars.get('ansible_sudo_flags') or '',
self._host_vars.get('ansible_become_flags') or '',
)
for term in ansible.utils.shlex.shlex_split(s)
]
def mitogen_via(self):
return self._host_vars.get('mitogen_via')
def mitogen_kind(self):
return self._host_vars.get('mitogen_kind')
def mitogen_mask_remote_name(self):
return self._host_vars.get('mitogen_mask_remote_name')
def mitogen_buildah_path(self):
return self._host_vars.get('mitogen_buildah_path')
def mitogen_docker_path(self):
return self._host_vars.get('mitogen_docker_path')
def mitogen_kubectl_path(self):
return self._host_vars.get('mitogen_kubectl_path')
def mitogen_lxc_path(self):
return self.host_vars.get('mitogen_lxc_path')
def mitogen_lxc_attach_path(self):
return self._host_vars.get('mitogen_lxc_attach_path')
def mitogen_lxc_info_path(self):
return self._host_vars.get('mitogen_lxc_info_path')
def mitogen_ssh_keepalive_interval(self):
return self._host_vars.get('mitogen_ssh_keepalive_interval')
def mitogen_ssh_keepalive_count(self):
return self._host_vars.get('mitogen_ssh_keepalive_count')
def mitogen_machinectl_path(self):
return self._host_vars.get('mitogen_machinectl_path')
def mitogen_ssh_debug_level(self):
return self._host_vars.get('mitogen_ssh_debug_level')
def mitogen_ssh_compression(self):
return self._host_vars.get('mitogen_ssh_compression')
def extra_args(self):
return [] # TODO
def ansible_doas_exe(self):
return (
self._host_vars.get('ansible_doas_exe') or
os.environ.get('ANSIBLE_DOAS_EXE')
)