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594 lines
25 KiB
594 lines
25 KiB
# Copyright 2016 Pierre Chifflier <pollux@wzdftpd.net>
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#
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# SSH + lxc-attach connection module for Ansible 2.0
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#
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# Adapted from ansible/plugins/connection/ssh.py
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#
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# Ansible is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Ansible is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
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#
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import fcntl
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import os
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import pipes
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import pty
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import select
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import shlex
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import subprocess
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from ansible import constants as C
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from ansible.compat.six import text_type, binary_type
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from ansible.plugins.connection import ConnectionBase
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from ansible.utils.path import unfrackpath, makedirs_safe
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from ansible.module_utils._text import to_bytes, to_text
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try:
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from __main__ import display
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except ImportError:
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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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transport = 'lxc_ssh'
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has_pipelining = True
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def __init__(self, play_context, new_stdin, *args, **kwargs):
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#print args
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#print kwargs
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super(Connection, self).__init__(play_context, new_stdin, *args, **kwargs)
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self.host=self._play_context.remote_addr
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self.container_name = play_context.docker_extra_args # XXX
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def _connect(self):
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''' connect to the lxc; nothing to do here '''
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display.vvv('XXX connect')
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super(Connection, self)._connect()
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#self.container_name = self.ssh._play_context.remote_addr
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# self._play_context.ssh_extra_args = ""
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#self.container = None
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@staticmethod
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def _persistence_controls(command):
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'''
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Takes a command array and scans it for ControlPersist and ControlPath
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settings and returns two booleans indicating whether either was found.
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This could be smarter, e.g. returning false if ControlPersist is 'no',
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but for now we do it simple way.
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'''
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controlpersist = False
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controlpath = False
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for arg in command:
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if 'controlpersist' in arg.lower():
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controlpersist = True
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elif 'controlpath' in arg.lower():
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controlpath = True
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return controlpersist, controlpath
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@staticmethod
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def _split_args(argstring):
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"""
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Takes a string like '-o Foo=1 -o Bar="foo bar"' and returns a
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list ['-o', 'Foo=1', '-o', 'Bar=foo bar'] that can be added to
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the argument list. The list will not contain any empty elements.
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"""
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return [to_text(x.strip()) for x in shlex.split(to_bytes(argstring)) if x.strip()]
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def _add_args(self, explanation, args):
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"""
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Adds the given args to self._command and displays a caller-supplied
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explanation of why they were added.
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"""
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self._command += args
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display.vvvvv('SSH: ' + explanation + ': (%s)' % ')('.join(args), host=self._play_context.remote_addr)
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def _build_command(self, binary, *other_args):
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self._command = []
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self._command += [binary]
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self._command += ['-C']
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if self._play_context.verbosity > 3:
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self._command += ['-vvv']
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elif binary == 'ssh':
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# Older versions of ssh (e.g. in RHEL 6) don't accept sftp -q.
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self._command += ['-q']
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# Next, we add [ssh_connection]ssh_args from ansible.cfg.
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# if self._play_context.ssh_args:
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# args = self._split_args(self._play_context.ssh_args)
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# self._add_args("ansible.cfg set ssh_args", args)
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# Now we add various arguments controlled by configuration file settings
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# (e.g. host_key_checking) or inventory variables (ansible_ssh_port) or
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# a combination thereof.
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if not C.HOST_KEY_CHECKING:
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self._add_args(
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"ANSIBLE_HOST_KEY_CHECKING/host_key_checking disabled",
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("-o", "StrictHostKeyChecking=no")
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)
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if self._play_context.port is not None:
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self._add_args(
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"ANSIBLE_REMOTE_PORT/remote_port/ansible_port set",
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("-o", "Port={0}".format(self._play_context.port))
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)
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key = self._play_context.private_key_file
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if key:
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self._add_args(
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"ANSIBLE_PRIVATE_KEY_FILE/private_key_file/ansible_ssh_private_key_file set",
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("-o", "IdentityFile=\"{0}\"".format(os.path.expanduser(key)))
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)
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if not self._play_context.password:
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self._add_args(
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"ansible_password/ansible_ssh_pass not set", (
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"-o", "KbdInteractiveAuthentication=no",
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"-o", "PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey",
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"-o", "PasswordAuthentication=no"
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)
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)
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user = self._play_context.remote_user
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if user:
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self._add_args(
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"ANSIBLE_REMOTE_USER/remote_user/ansible_user/user/-u set",
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("-o", "User={0}".format(to_bytes(self._play_context.remote_user)))
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)
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self._add_args(
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"ANSIBLE_TIMEOUT/timeout set",
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("-o", "ConnectTimeout={0}".format(self._play_context.timeout))
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)
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# Check if ControlPersist is enabled and add a ControlPath if one hasn't
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# already been set.
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controlpersist, controlpath = self._persistence_controls(self._command)
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if controlpersist:
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self._persistent = True
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if not controlpath:
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cpdir = unfrackpath('$HOME/.ansible/cp')
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# The directory must exist and be writable.
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makedirs_safe(cpdir, 0o700)
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if not os.access(cpdir, os.W_OK):
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raise AnsibleError("Cannot write to ControlPath %s" % cpdir)
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args = ("-o", "ControlPath={0}".format(
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to_bytes(C.ANSIBLE_SSH_CONTROL_PATH % dict(directory=cpdir)))
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)
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self._add_args("found only ControlPersist; added ControlPath", args)
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## Finally, we add any caller-supplied extras.
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if other_args:
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self._command += other_args
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return self._command
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def _send_initial_data(self, fh, in_data):
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'''
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Writes initial data to the stdin filehandle of the subprocess and closes
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it. (The handle must be closed; otherwise, for example, "sftp -b -" will
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just hang forever waiting for more commands.)
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'''
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display.debug('Sending initial data')
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try:
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fh.write(in_data)
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fh.close()
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except (OSError, IOError):
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raise AnsibleConnectionFailure('SSH Error: data could not be sent to the remote host. Make sure this host can be reached over ssh')
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display.debug('Sent initial data (%d bytes)' % len(in_data))
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# Used by _run() to kill processes on failures
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@staticmethod
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def _terminate_process(p):
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""" Terminate a process, ignoring errors """
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try:
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p.terminate()
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except (OSError, IOError):
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pass
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# This is separate from _run() because we need to do the same thing for stdout
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# and stderr.
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def _examine_output(self, source, state, chunk, sudoable):
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'''
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Takes a string, extracts complete lines from it, tests to see if they
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are a prompt, error message, etc., and sets appropriate flags in self.
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Prompt and success lines are removed.
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Returns the processed (i.e. possibly-edited) output and the unprocessed
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remainder (to be processed with the next chunk) as strings.
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'''
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output = []
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for l in chunk.splitlines(True):
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suppress_output = False
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#display.debug("Examining line (source=%s, state=%s): '%s'" % (source, state, l.rstrip('\r\n')))
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if self._play_context.prompt and self.check_password_prompt(l):
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display.debug("become_prompt: (source=%s, state=%s): '%s'" % (source, state, l.rstrip('\r\n')))
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self._flags['become_prompt'] = True
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suppress_output = True
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elif self._play_context.success_key and self.check_become_success(l):
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display.debug("become_success: (source=%s, state=%s): '%s'" % (source, state, l.rstrip('\r\n')))
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self._flags['become_success'] = True
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suppress_output = True
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elif sudoable and self.check_incorrect_password(l):
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display.debug("become_error: (source=%s, state=%s): '%s'" % (source, state, l.rstrip('\r\n')))
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self._flags['become_error'] = True
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elif sudoable and self.check_missing_password(l):
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display.debug("become_nopasswd_error: (source=%s, state=%s): '%s'" % (source, state, l.rstrip('\r\n')))
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self._flags['become_nopasswd_error'] = True
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if not suppress_output:
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output.append(l)
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# The chunk we read was most likely a series of complete lines, but just
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# in case the last line was incomplete (and not a prompt, which we would
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# have removed from the output), we retain it to be processed with the
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# next chunk.
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remainder = ''
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if output and not output[-1].endswith('\n'):
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remainder = output[-1]
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output = output[:-1]
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return ''.join(output), remainder
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def _run(self, cmd, in_data, sudoable=True):
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'''
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Starts the command and communicates with it until it ends.
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'''
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display_cmd = map(to_text, map(pipes.quote, cmd))
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display.vvv(u'SSH: EXEC {0}'.format(u' '.join(display_cmd)), host=self.host)
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# Start the given command. If we don't need to pipeline data, we can try
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# to use a pseudo-tty (ssh will have been invoked with -tt). If we are
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# pipelining data, or can't create a pty, we fall back to using plain
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# old pipes.
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p = None
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if isinstance(cmd, (text_type, binary_type)):
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cmd = to_bytes(cmd)
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else:
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cmd = map(to_bytes, cmd)
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if not in_data:
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try:
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# Make sure stdin is a proper pty to avoid tcgetattr errors
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master, slave = pty.openpty()
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p = subprocess.Popen(cmd, stdin=slave, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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stdin = os.fdopen(master, 'w', 0)
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os.close(slave)
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except (OSError, IOError):
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p = None
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if not p:
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p = subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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stdin = p.stdin
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# If we are using SSH password authentication, write the password into
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# the pipe we opened in _build_command.
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if self._play_context.password:
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os.close(self.sshpass_pipe[0])
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os.write(self.sshpass_pipe[1], "{0}\n".format(to_bytes(self._play_context.password)))
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os.close(self.sshpass_pipe[1])
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## SSH state machine
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#
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# Now we read and accumulate output from the running process until it
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# exits. Depending on the circumstances, we may also need to write an
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# escalation password and/or pipelined input to the process.
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states = [
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'awaiting_prompt', 'awaiting_escalation', 'ready_to_send', 'awaiting_exit'
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]
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# Are we requesting privilege escalation? Right now, we may be invoked
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# to execute sftp/scp with sudoable=True, but we can request escalation
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# only when using ssh. Otherwise we can send initial data straightaway.
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state = states.index('ready_to_send')
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if b'ssh' in cmd:
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if self._play_context.prompt:
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# We're requesting escalation with a password, so we have to
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# wait for a password prompt.
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state = states.index('awaiting_prompt')
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display.debug('Initial state: %s: %s' % (states[state], self._play_context.prompt))
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elif self._play_context.become and self._play_context.success_key:
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# We're requesting escalation without a password, so we have to
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# detect success/failure before sending any initial data.
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state = states.index('awaiting_escalation')
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display.debug('Initial state: %s: %s' % (states[state], self._play_context.success_key))
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# We store accumulated stdout and stderr output from the process here,
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# but strip any privilege escalation prompt/confirmation lines first.
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# Output is accumulated into tmp_*, complete lines are extracted into
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# an array, then checked and removed or copied to stdout or stderr. We
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# set any flags based on examining the output in self._flags.
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stdout = stderr = ''
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tmp_stdout = tmp_stderr = ''
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self._flags = dict(
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become_prompt=False, become_success=False,
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become_error=False, become_nopasswd_error=False
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)
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# select timeout should be longer than the connect timeout, otherwise
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# they will race each other when we can't connect, and the connect
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# timeout usually fails
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timeout = 2 + self._play_context.timeout
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rpipes = [p.stdout, p.stderr]
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for fd in rpipes:
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fcntl.fcntl(fd, fcntl.F_SETFL, fcntl.fcntl(fd, fcntl.F_GETFL) | os.O_NONBLOCK)
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# If we can send initial data without waiting for anything, we do so
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# before we call select.
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if states[state] == 'ready_to_send' and in_data:
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self._send_initial_data(stdin, in_data)
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state += 1
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while True:
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rfd, wfd, efd = select.select(rpipes, [], [], timeout)
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# We pay attention to timeouts only while negotiating a prompt.
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if not rfd:
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if state <= states.index('awaiting_escalation'):
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# If the process has already exited, then it's not really a
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# timeout; we'll let the normal error handling deal with it.
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if p.poll() is not None:
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break
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self._terminate_process(p)
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raise AnsibleError('Timeout (%ds) waiting for privilege escalation prompt: %s' % (timeout, stdout))
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# Read whatever output is available on stdout and stderr, and stop
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# listening to the pipe if it's been closed.
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if p.stdout in rfd:
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chunk = p.stdout.read()
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if chunk == '':
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rpipes.remove(p.stdout)
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tmp_stdout += chunk
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display.debug("stdout chunk (state=%s):\n>>>%s<<<\n" % (state, chunk))
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if p.stderr in rfd:
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chunk = p.stderr.read()
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if chunk == '':
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rpipes.remove(p.stderr)
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tmp_stderr += chunk
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display.debug("stderr chunk (state=%s):\n>>>%s<<<\n" % (state, chunk))
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# We examine the output line-by-line until we have negotiated any
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# privilege escalation prompt and subsequent success/error message.
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# Afterwards, we can accumulate output without looking at it.
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if state < states.index('ready_to_send'):
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if tmp_stdout:
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output, unprocessed = self._examine_output('stdout', states[state], tmp_stdout, sudoable)
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stdout += output
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tmp_stdout = unprocessed
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if tmp_stderr:
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output, unprocessed = self._examine_output('stderr', states[state], tmp_stderr, sudoable)
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stderr += output
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tmp_stderr = unprocessed
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else:
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stdout += tmp_stdout
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stderr += tmp_stderr
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tmp_stdout = tmp_stderr = ''
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# If we see a privilege escalation prompt, we send the password.
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# (If we're expecting a prompt but the escalation succeeds, we
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# didn't need the password and can carry on regardless.)
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if states[state] == 'awaiting_prompt':
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if self._flags['become_prompt']:
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display.debug('Sending become_pass in response to prompt')
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stdin.write('{0}\n'.format(to_bytes(self._play_context.become_pass )))
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self._flags['become_prompt'] = False
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state += 1
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elif self._flags['become_success']:
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state += 1
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# We've requested escalation (with or without a password), now we
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# wait for an error message or a successful escalation.
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if states[state] == 'awaiting_escalation':
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if self._flags['become_success']:
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display.debug('Escalation succeeded')
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self._flags['become_success'] = False
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state += 1
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elif self._flags['become_error']:
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display.debug('Escalation failed')
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self._terminate_process(p)
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self._flags['become_error'] = False
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raise AnsibleError('Incorrect %s password' % self._play_context.become_method)
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elif self._flags['become_nopasswd_error']:
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display.debug('Escalation requires password')
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self._terminate_process(p)
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self._flags['become_nopasswd_error'] = False
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raise AnsibleError('Missing %s password' % self._play_context.become_method)
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elif self._flags['become_prompt']:
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# This shouldn't happen, because we should see the "Sorry,
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# try again" message first.
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display.debug('Escalation prompt repeated')
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self._terminate_process(p)
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self._flags['become_prompt'] = False
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raise AnsibleError('Incorrect %s password' % self._play_context.become_method)
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# Once we're sure that the privilege escalation prompt, if any, has
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# been dealt with, we can send any initial data and start waiting
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# for output.
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if states[state] == 'ready_to_send':
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if in_data:
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self._send_initial_data(stdin, in_data)
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state += 1
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# Now we're awaiting_exit: has the child process exited? If it has,
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# and we've read all available output from it, we're done.
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if p.poll() is not None:
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if not rpipes or not rfd:
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break
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# When ssh has ControlMaster (+ControlPath/Persist) enabled, the
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# first connection goes into the background and we never see EOF
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# on stderr. If we see EOF on stdout and the process has exited,
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# we're probably done. We call select again with a zero timeout,
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# just to make certain we don't miss anything that may have been
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# written to stderr between the time we called select() and when
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# we learned that the process had finished.
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if p.stdout not in rpipes:
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timeout = 0
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continue
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# If the process has not yet exited, but we've already read EOF from
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# its stdout and stderr (and thus removed both from rpipes), we can
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# just wait for it to exit.
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elif not rpipes:
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p.wait()
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break
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# Otherwise there may still be outstanding data to read.
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# close stdin after process is terminated and stdout/stderr are read
|
|
# completely (see also issue #848)
|
|
stdin.close()
|
|
|
|
if C.HOST_KEY_CHECKING:
|
|
if cmd[0] == b"sshpass" and p.returncode == 6:
|
|
raise AnsibleError('Using a SSH password instead of a key is not possible because Host Key checking is enabled and sshpass does not support this. Please add this host\'s fingerprint to your known_hosts file to manage this host.')
|
|
|
|
controlpersisterror = 'Bad configuration option: ControlPersist' in stderr or 'unknown configuration option: ControlPersist' in stderr
|
|
if p.returncode != 0 and controlpersisterror:
|
|
raise AnsibleError('using -c ssh on certain older ssh versions may not support ControlPersist, set ANSIBLE_SSH_ARGS="" (or ssh_args in [ssh_connection] section of the config file) before running again')
|
|
|
|
if p.returncode == 255 and in_data:
|
|
raise AnsibleConnectionFailure('SSH Error: data could not be sent to the remote host. Make sure this host can be reached over ssh')
|
|
|
|
return (p.returncode, stdout, stderr)
|
|
|
|
def _exec_command(self, cmd, in_data=None, sudoable=True):
|
|
''' run a command on the remote host '''
|
|
|
|
super(Connection, self).exec_command(cmd, in_data=in_data, sudoable=sudoable)
|
|
|
|
display.vvv(u"ESTABLISH SSH CONNECTION FOR USER: {0}".format(self._play_context.remote_user), host=self._play_context.remote_addr)
|
|
|
|
# we can only use tty when we are not pipelining the modules. piping
|
|
# data into /usr/bin/python inside a tty automatically invokes the
|
|
# python interactive-mode but the modules are not compatible with the
|
|
# interactive-mode ("unexpected indent" mainly because of empty lines)
|
|
|
|
if in_data:
|
|
cmd = self._build_command('ssh', self.host, cmd)
|
|
else:
|
|
cmd = self._build_command('ssh', '-tt', self.host, cmd)
|
|
|
|
(returncode, stdout, stderr) = self._run(cmd, in_data, sudoable=sudoable)
|
|
|
|
return (returncode, stdout, stderr)
|
|
|
|
|
|
|
|
def dir_print(self,obj):
|
|
for attr_name in dir(obj):
|
|
try:
|
|
attr_value = getattr(obj, attr_name)
|
|
print(attr_name, attr_value, callable(attr_value))
|
|
except:
|
|
pass
|
|
|
|
|
|
|
|
def exec_command(self, cmd, in_data=None, sudoable=False):
|
|
''' run a command on the chroot '''
|
|
display.vvv('XXX exec_command: %s' % cmd)
|
|
super(Connection, self).exec_command(cmd, in_data=in_data, sudoable=sudoable)
|
|
# print dir(self)
|
|
# print dir(self._play_context)
|
|
# print self._play_context._attributes
|
|
# self.dir_print(self._play_context)
|
|
# print dir(self._play_context._vars)
|
|
# print self._play_context._attributes['vars']
|
|
# vm = self._play_context.get_ds()
|
|
# print( vm )
|
|
# raise "blah"
|
|
h = self.container_name
|
|
lxc_cmd = 'lxc-attach --name %s -- /bin/sh -c %s' \
|
|
% (pipes.quote(h),
|
|
pipes.quote(cmd))
|
|
if in_data:
|
|
cmd = self._build_command('ssh', self.host, lxc_cmd)
|
|
else:
|
|
cmd = self._build_command('ssh', '-tt', self.host, lxc_cmd)
|
|
#self.ssh.exec_command(lxc_cmd,in_data,sudoable)
|
|
(returncode, stdout, stderr) = self._run(cmd, in_data, sudoable=sudoable)
|
|
return (returncode, stdout, stderr)
|
|
|
|
|
|
def put_file(self, in_path, out_path):
|
|
''' transfer a file from local to lxc '''
|
|
display.vvv('XXX put_file %s %s' % (in_path,out_path))
|
|
super(Connection, self).put_file(in_path, out_path)
|
|
if not os.path.exists(in_path):
|
|
raise errors.AnsibleFileNotFound("file or module does not exist: %s" % in_path)
|
|
|
|
with open(in_path,'r') as in_f:
|
|
in_data = in_f.read()
|
|
cmd = ('cat > %s; echo -n done' % pipes.quote(out_path))
|
|
h = self.container_name
|
|
lxc_cmd = 'lxc-attach --name %s -- /bin/sh -c %s' \
|
|
% (pipes.quote(h),
|
|
pipes.quote(cmd))
|
|
if in_data:
|
|
cmd = self._build_command('ssh', self.host, lxc_cmd)
|
|
else:
|
|
cmd = self._build_command('ssh', '-tt', self.host, lxc_cmd)
|
|
#self.ssh.exec_command(lxc_cmd,in_data,sudoable)
|
|
(returncode, stdout, stderr) = self._run(cmd, in_data, sudoable=False)
|
|
return (returncode, stdout, stderr)
|
|
|
|
def fetch_file(self, in_path, out_path):
|
|
''' fetch a file from lxc to local '''
|
|
display.vvv('XXX fetch_file %s %s' % (in_path,out_path))
|
|
super(Connection, self).fetch_file(in_path, out_path)
|
|
cmd = ('cat %s' % pipes.quote(in_path))
|
|
h = self.container_name
|
|
lxc_cmd = 'lxc-attach --name %s -- /bin/sh -c %s' \
|
|
% (pipes.quote(h),
|
|
pipes.quote(cmd))
|
|
in_data = None
|
|
if in_data:
|
|
cmd = self._build_command('ssh', self.host, lxc_cmd)
|
|
else:
|
|
cmd = self._build_command('ssh', '-tt', self.host, lxc_cmd)
|
|
(returncode, stdout, stderr) = self._run(cmd, in_data, sudoable=False)
|
|
if returncode != 0:
|
|
raise AnsibleError("failed to transfer file from {0}:\n{1}\n{2}".format(in_path, stdout, stderr))
|
|
with open(out_path,'w') as out_f:
|
|
out_f.write(stdout)
|
|
|
|
def close(self):
|
|
''' terminate the connection; nothing to do here '''
|
|
display.vvv('XXX close')
|
|
super(Connection, self).close()
|
|
#self.ssh.close()
|
|
self._connected = False
|