# Copyright 2017, 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 import logging import os import shlex import stat import time import jinja2.runtime import ansible.constants as C import ansible.errors import ansible.plugins.connection import ansible.utils.shlex import mitogen.unix import mitogen.utils import ansible_mitogen.target import ansible_mitogen.process import ansible_mitogen.services LOG = logging.getLogger(__name__) def _connect_local(spec): return { 'method': 'local', 'kwargs': { 'python_path': spec['python_path'], } } def wrap_or_none(klass, value): if value is not None: return klass(value) def _connect_ssh(spec): if C.HOST_KEY_CHECKING: check_host_keys = 'enforce' else: check_host_keys = 'ignore' return { 'method': 'ssh', 'kwargs': { 'check_host_keys': check_host_keys, 'hostname': spec['remote_addr'], 'username': spec['remote_user'], 'password': wrap_or_none(mitogen.core.Secret, spec['password']), 'port': spec['port'], 'python_path': spec['python_path'], 'identity_file': spec['private_key_file'], 'ssh_path': spec['ssh_executable'], 'connect_timeout': spec['ansible_ssh_timeout'], 'ssh_args': spec['ssh_args'], 'ssh_debug_level': spec['mitogen_ssh_debug_level'], } } def _connect_docker(spec): return { 'method': 'docker', 'kwargs': { 'username': spec['remote_user'], 'container': spec['remote_addr'], 'python_path': spec['python_path'], 'connect_timeout': spec['ansible_ssh_timeout'] or spec['timeout'], } } def _connect_jail(spec): return { 'method': 'jail', 'kwargs': { 'username': spec['remote_user'], 'container': spec['remote_addr'], 'python_path': spec['python_path'], 'connect_timeout': spec['ansible_ssh_timeout'] or spec['timeout'], } } def _connect_lxc(spec): return { 'method': 'lxc', 'kwargs': { 'container': spec['remote_addr'], 'python_path': spec['python_path'], 'connect_timeout': spec['ansible_ssh_timeout'] or spec['timeout'], } } def _connect_machinectl(spec): return _connect_setns(dict(spec, mitogen_kind='machinectl')) def _connect_setns(spec): return { 'method': 'setns', 'kwargs': { 'container': spec['remote_addr'], 'username': spec['remote_user'], 'python_path': spec['python_path'], 'kind': spec['mitogen_kind'], 'docker_path': spec['mitogen_docker_path'], 'lxc_info_path': spec['mitogen_lxc_info_path'], 'machinectl_path': spec['mitogen_machinectl_path'], } } def _connect_su(spec): return { 'method': 'su', 'enable_lru': True, 'kwargs': { 'username': spec['become_user'], 'password': wrap_or_none(mitogen.core.Secret, spec['become_pass']), 'python_path': spec['python_path'], 'su_path': spec['become_exe'], 'connect_timeout': spec['timeout'], } } def _connect_sudo(spec): return { 'method': 'sudo', 'enable_lru': True, 'kwargs': { 'username': spec['become_user'], 'password': wrap_or_none(mitogen.core.Secret, spec['become_pass']), 'python_path': spec['python_path'], 'sudo_path': spec['become_exe'], 'connect_timeout': spec['timeout'], 'sudo_args': spec['sudo_args'], } } def _connect_mitogen_su(spec): # su as a first-class proxied connection, not a become method. return { 'method': 'su', 'kwargs': { 'username': spec['remote_user'], 'password': wrap_or_none(mitogen.core.Secret, spec['password']), 'python_path': spec['python_path'], 'su_path': spec['become_exe'], 'connect_timeout': spec['timeout'], } } def _connect_mitogen_sudo(spec): # sudo as a first-class proxied connection, not a become method. return { 'method': 'sudo', 'kwargs': { 'username': spec['remote_user'], 'password': wrap_or_none(mitogen.core.Secret, spec['password']), 'python_path': spec['python_path'], 'sudo_path': spec['become_exe'], 'connect_timeout': spec['timeout'], 'sudo_args': spec['sudo_args'], } } CONNECTION_METHOD = { 'docker': _connect_docker, 'jail': _connect_jail, 'local': _connect_local, 'lxc': _connect_lxc, 'lxd': _connect_lxc, 'machinectl': _connect_machinectl, 'setns': _connect_setns, 'ssh': _connect_ssh, 'su': _connect_su, 'sudo': _connect_sudo, 'mitogen_su': _connect_mitogen_su, 'mitogen_sudo': _connect_mitogen_sudo, } def config_from_play_context(transport, inventory_name, connection): """ Return a dict representing all important connection configuration, allowing the same functions to work regardless of whether configuration came from play_context (direct connection) or host vars (mitogen_via=). """ return { 'transport': transport, 'inventory_name': inventory_name, 'remote_addr': connection._play_context.remote_addr, 'remote_user': connection._play_context.remote_user, 'become': connection._play_context.become, 'become_method': connection._play_context.become_method, 'become_user': connection._play_context.become_user, 'become_pass': connection._play_context.become_pass, 'password': connection._play_context.password, 'port': connection._play_context.port, 'python_path': connection.python_path, 'private_key_file': connection._play_context.private_key_file, 'ssh_executable': connection._play_context.ssh_executable, 'timeout': connection._play_context.timeout, 'ansible_ssh_timeout': connection.ansible_ssh_timeout, 'ssh_args': [ term for s in ( getattr(connection._play_context, 'ssh_args', ''), getattr(connection._play_context, 'ssh_common_args', ''), getattr(connection._play_context, 'ssh_extra_args', '') ) for term in ansible.utils.shlex.shlex_split(s or '') ], 'become_exe': connection._play_context.become_exe, 'sudo_args': [ term for s in ( connection._play_context.sudo_flags, connection._play_context.become_flags ) for term in ansible.utils.shlex.shlex_split(s or '') ], 'mitogen_via': connection.mitogen_via, 'mitogen_kind': connection.mitogen_kind, 'mitogen_docker_path': connection.mitogen_docker_path, 'mitogen_lxc_info_path': connection.mitogen_lxc_info_path, 'mitogen_machinectl_path': connection.mitogen_machinectl_path, 'mitogen_ssh_debug_level': connection.mitogen_ssh_debug_level, } def config_from_hostvars(transport, inventory_name, connection, hostvars, become_user): """ Override config_from_play_context() to take equivalent information from host vars. """ config = config_from_play_context(transport, inventory_name, connection) hostvars = dict(hostvars) return dict(config, **{ 'remote_addr': hostvars.get('ansible_hostname', inventory_name), 'become': bool(become_user), 'become_user': become_user, 'become_pass': None, 'remote_user': hostvars.get('ansible_user'), # TODO 'password': (hostvars.get('ansible_ssh_pass') or hostvars.get('ansible_password')), 'port': hostvars.get('ansible_port'), 'python_path': hostvars.get('ansible_python_interpreter'), 'private_key_file': (hostvars.get('ansible_ssh_private_key_file') or hostvars.get('ansible_private_key_file')), 'mitogen_via': hostvars.get('mitogen_via'), 'mitogen_kind': hostvars.get('mitogen_kind'), 'mitogen_docker_path': hostvars.get('mitogen_docker_path'), 'mitogen_lxc_info_path': hostvars.get('mitogen_lxc_info_path'), 'mitogen_machinectl_path': hostvars.get('mitogen_machinctl_path'), }) class Connection(ansible.plugins.connection.ConnectionBase): #: mitogen.master.Broker for this worker. broker = None #: mitogen.master.Router for this worker. router = None #: mitogen.master.Context representing the parent Context, which is #: presently always the connection multiplexer process. parent = None #: mitogen.master.Context connected to the target user account on the #: target machine (i.e. via sudo). context = None #: mitogen.master.Context connected to the fork parent process in the #: target user account. fork_context = None #: Only sudo and su are supported for now. become_methods = ['sudo', 'su'] #: Set to 'ansible_python_interpreter' by on_action_run(). python_path = None #: Set to 'ansible_ssh_timeout' by on_action_run(). ansible_ssh_timeout = None #: Set to 'mitogen_via' by on_action_run(). mitogen_via = None #: Set to 'mitogen_kind' by on_action_run(). mitogen_kind = None #: Set to 'mitogen_docker_path' by on_action_run(). mitogen_docker_path = None #: Set to 'mitogen_lxc_info_path' by on_action_run(). mitogen_lxc_info_path = None #: Set to 'mitogen_lxc_info_path' by on_action_run(). mitogen_machinectl_path = None #: Set to 'mitogen_ssh_debug_level' by on_action_run(). mitogen_ssh_debug_level = None #: Set to 'inventory_hostname' by on_action_run(). inventory_hostname = None #: Set to 'hostvars' by on_action_run() host_vars = None #: Set after connection to the target context's home directory. home_dir = None def __init__(self, play_context, new_stdin, **kwargs): assert ansible_mitogen.process.MuxProcess.unix_listener_path, ( 'Mitogen connection types may only be instantiated ' 'while the "mitogen" strategy is active.' ) super(Connection, self).__init__(play_context, new_stdin) def __del__(self): """ Ansible cannot be trusted to always call close() e.g. the synchronize action constructs a local connection like this. So provide a destructor in the hopes of catching these cases. """ # https://github.com/dw/mitogen/issues/140 self.close() def on_action_run(self, task_vars): """ Invoked by ActionModuleMixin to indicate a new task is about to start executing. We use the opportunity to grab relevant bits from the task-specific data. """ self.ansible_ssh_timeout = task_vars.get('ansible_ssh_timeout', C.DEFAULT_TIMEOUT) self.python_path = task_vars.get('ansible_python_interpreter', '/usr/bin/python') self.mitogen_via = task_vars.get('mitogen_via') self.mitogen_kind = task_vars.get('mitogen_kind') self.mitogen_docker_path = task_vars.get('mitogen_docker_path') self.mitogen_lxc_info_path = task_vars.get('mitogen_lxc_info_path') self.mitogen_machinectl_path = task_vars.get('mitogen_machinectl_path') self.mitogen_ssh_debug_level = task_vars.get('mitogen_ssh_debug_level') self.inventory_hostname = task_vars['inventory_hostname'] self.host_vars = task_vars['hostvars'] self.close(new_task=True) @property def homedir(self): self._connect() return self.home_dir @property def connected(self): return self.context is not None def _config_from_via(self, via_spec): become_user, _, inventory_name = via_spec.rpartition('@') via_vars = self.host_vars[inventory_name] if isinstance(via_vars, jinja2.runtime.Undefined): raise ansible.errors.AnsibleConnectionFailure( self.unknown_via_msg % ( self.mitogen_via, inventory_name, ) ) return config_from_hostvars( transport=via_vars.get('ansible_connection', 'ssh'), inventory_name=inventory_name, connection=self, hostvars=via_vars, become_user=become_user or None, ) unknown_via_msg = 'mitogen_via=%s of %s specifies an unknown hostname' via_cycle_msg = 'mitogen_via=%s of %s creates a cycle (%s)' def _stack_from_config(self, config, stack=(), seen_names=()): if config['inventory_name'] in seen_names: raise ansible.errors.AnsibleConnectionFailure( self.via_cycle_msg % ( config['mitogen_via'], config['inventory_name'], ' -> '.join(reversed( seen_names + (config['inventory_name'],) )), ) ) if config['mitogen_via']: stack, seen_names = self._stack_from_config( self._config_from_via(config['mitogen_via']), stack=stack, seen_names=seen_names + (config['inventory_name'],) ) stack += (CONNECTION_METHOD[config['transport']](config),) if config['become']: stack += (CONNECTION_METHOD[config['become_method']](config),) return stack, seen_names def _connect(self): """ Establish a connection to the master process's UNIX listener socket, constructing a mitogen.master.Router to communicate with the master, and a mitogen.master.Context to represent it. Depending on the original transport we should emulate, trigger one of the _connect_*() service calls defined above to cause the master process to establish the real connection on our behalf, or return a reference to the existing one. """ if self.connected: return if not self.broker: self.broker = mitogen.master.Broker() self.router, self.parent = mitogen.unix.connect( path=ansible_mitogen.process.MuxProcess.unix_listener_path, broker=self.broker, ) stack, _ = self._stack_from_config( config_from_play_context( transport=self.transport, inventory_name=self.inventory_hostname, connection=self ) ) dct = self.parent.call_service( service_name='ansible_mitogen.services.ContextService', method_name='get', stack=mitogen.utils.cast(list(stack)), ) if dct['msg']: if dct['method_name'] in self.become_methods: raise ansible.errors.AnsibleModuleError(dct['msg']) raise ansible.errors.AnsibleConnectionFailure(dct['msg']) self.context = dct['context'] self.fork_context = dct['init_child_result']['fork_context'] self.home_dir = dct['init_child_result']['home_dir'] def close(self, new_task=False): """ Arrange for the mitogen.master.Router running in the worker to gracefully shut down, and wait for shutdown to complete. Safe to call multiple times. """ if self.context: self.parent.call_service( service_name='ansible_mitogen.services.ContextService', method_name='put', context=self.context ) self.context = None if self.broker and not new_task: self.broker.shutdown() self.broker.join() self.broker = None self.router = None def call_async(self, func, *args, **kwargs): """ Start a function call to the target. :returns: mitogen.core.Receiver that receives the function call result. """ self._connect() return self.context.call_async(func, *args, **kwargs) def call(self, func, *args, **kwargs): """ Start and wait for completion of a function call in the target. :raises mitogen.core.CallError: The function call failed. :returns: Function return value. """ t0 = time.time() try: return self.call_async(func, *args, **kwargs).get().unpickle() finally: LOG.debug('Call took %d ms: %s%r', 1000 * (time.time() - t0), func.func_name, args) def create_fork_child(self): """ Fork a new child off the target context. The actual fork occurs from the 'virginal fork parent', which does not any Ansible modules prior to fork, to avoid conflicts resulting from custom module_utils paths. :returns: mitogen.core.Context of the new child. """ return self.call(ansible_mitogen.target.create_fork_child) def exec_command(self, cmd, in_data='', sudoable=True, mitogen_chdir=None): """ Implement exec_command() by calling the corresponding ansible_mitogen.target function in the target. :param str cmd: Shell command to execute. :param bytes in_data: Data to supply on ``stdin`` of the process. :returns: (return code, stdout bytes, stderr bytes) """ emulate_tty = (not in_data and sudoable) rc, stdout, stderr = self.call( ansible_mitogen.target.exec_command, cmd=mitogen.utils.cast(cmd), in_data=mitogen.utils.cast(in_data), chdir=mitogen_chdir, emulate_tty=emulate_tty, ) stderr += 'Shared connection to %s closed.%s' % ( self._play_context.remote_addr, ('\r\n' if emulate_tty else '\n'), ) return rc, stdout, stderr def fetch_file(self, in_path, out_path): """ Implement fetch_file() by calling the corresponding ansible_mitogen.target function in the target. :param str in_path: Remote filesystem path to read. :param str out_path: Local filesystem path to write. """ output = self.call(ansible_mitogen.target.read_path, mitogen.utils.cast(in_path)) ansible_mitogen.target.write_path(out_path, output) def put_data(self, out_path, data, mode=None, utimes=None): """ Implement put_file() by caling the corresponding ansible_mitogen.target function in the target. :param str out_path: Remote filesystem path to write. :param byte data: File contents to put. """ self.call(ansible_mitogen.target.write_path, mitogen.utils.cast(out_path), mitogen.core.Blob(data), mode=mode, utimes=utimes) def put_file(self, in_path, out_path): """ Implement put_file() by streamily transferring the file via FileService. :param str in_path: Local filesystem path to read. :param str out_path: Remote filesystem path to write. """ st = os.stat(in_path) if not stat.S_ISREG(st.st_mode): raise IOError('%r is not a regular file.' % (in_path,)) # If the file is sufficiently small, just ship it in the argument list # rather than introducing an extra RTT for the child to request it from # FileService. if st.st_size <= 32768: fp = open(in_path, 'rb') try: s = fp.read(32769) finally: fp.close() # Ensure file was not growing during call. if len(s) == st.st_size: return self.put_data(out_path, s, mode=st.st_mode, utimes=(st.st_atime, st.st_mtime)) self.parent.call_service( service_name='mitogen.service.FileService', method_name='register', path=mitogen.utils.cast(in_path) ) self.call( ansible_mitogen.target.transfer_file, context=self.parent, in_path=in_path, out_path=out_path )