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840a32bc08
The main exec_command/put_file/fetch_file methods now _build_command and call _run to handle input from/output to the ssh process. The purpose is to bring connection handling together in one place so that the locking doesn't have to be split across functions. Note that this doesn't change the privilege escalation and connection IO code at all—just puts it all into one function. Most of the changes are just moving code from one place to another (e.g. from _connect to _build_command, from _exec_command and _communicate to _run), but there are some other notable changes: 1. We test for the existence of sshpass the first time we need to use password authentication, and remember the result. 2. We set _persistent in _build_command if we're using ControlPersist, for later use in close(). (The detection could be smarter.) 3. Some apparently inadvertent inconsistencies between put_file and fetch_file (e.g. argument quoting, sftp -b use) have been removed. Also reorders functions into a logical sequence, removes unused imports and functions, etc. Aside: the high-level EXEC/PUT/FETCH description should really be logged from ConnectionBase, while individual subclasses log transport-specific details.
539 lines
22 KiB
Python
539 lines
22 KiB
Python
# (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>
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#
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# This file is part of Ansible
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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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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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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 pwd
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import select
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import shlex
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import subprocess
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import time
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from ansible import constants as C
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from ansible.errors import AnsibleError, AnsibleConnectionFailure, AnsibleFileNotFound
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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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SSHPASS_AVAILABLE = None
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class Connection(ConnectionBase):
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''' ssh based connections '''
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transport = 'ssh'
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has_pipelining = True
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become_methods = frozenset(C.BECOME_METHODS).difference(['runas'])
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def __init__(self, *args, **kwargs):
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super(Connection, self).__init__(*args, **kwargs)
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self.host = self._play_context.remote_addr
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self.ssh_extra_args = ''
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self.ssh_args = ''
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def set_host_overrides(self, host):
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v = host.get_vars()
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if 'ansible_ssh_extra_args' in v:
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self.ssh_extra_args = v['ansible_ssh_extra_args']
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if 'ansible_ssh_args' in v:
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self.ssh_args = v['ansible_ssh_args']
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# The connection is created by running ssh/scp/sftp from the exec_command,
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# put_file, and fetch_file methods, so we don't need to do any connection
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# management here.
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def _connect(self):
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self._connected = True
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return self
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def close(self):
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# If we have a persistent ssh connection (ControlPersist), we can ask it
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# to stop listening. Otherwise, there's nothing to do here.
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# TODO: reenable once winrm issues are fixed
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# temporarily disabled as we are forced to currently close connections after every task because of winrm
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# if self._connected and self._persistent:
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# cmd = self._build_command('ssh', '-O', 'stop', self.host)
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# p = subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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# stdout, stderr = p.communicate()
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self._connected = False
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def _build_command(self, binary, *other_args):
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'''
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Takes a binary (ssh, scp, sftp) and optional extra arguments and returns
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a command line as an array that can be passed to subprocess.Popen after
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appending any extra commands to it.
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'''
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self._command = []
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## First, the command name.
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# If we want to use password authentication, we have to set up a pipe to
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# write the password to sshpass.
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if self._play_context.password:
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global SSHPASS_AVAILABLE
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# We test once if sshpass is available, and remember the result. It
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# would be nice to use distutils.spawn.find_executable for this, but
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# distutils isn't always available; shutils.which() is Python3-only.
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if SSHPASS_AVAILABLE is None:
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try:
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p = subprocess.Popen(["sshpass"], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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p.communicate()
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SSHPASS_AVAILABLE = True
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except OSError:
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SSHPASS_AVAILABLE = False
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if not SSHPASS_AVAILABLE:
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raise AnsibleError("to use the 'ssh' connection type with passwords, you must install the sshpass program")
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self.sshpass_pipe = os.pipe()
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self._command += ['sshpass', '-d{0}'.format(self.sshpass_pipe[0])]
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self._command += [binary]
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## Next, additional arguments based on the configuration.
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# sftp batch mode allows us to correctly catch failed transfers, but can
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# be disabled if the client side doesn't support the option. FIXME: is
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# this still a real concern?
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if binary == 'sftp' and C.DEFAULT_SFTP_BATCH_MODE:
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self._command += ['-b', '-']
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elif binary == 'ssh':
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self._command += ['-C']
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self._command += ['-vvv']
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# Next, we add ansible_ssh_args from the inventory if it's set, or
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# [ssh_connection]ssh_args from ansible.cfg, or the default Control*
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# settings.
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if self.ssh_args:
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args = self._split_args(self.ssh_args)
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self.add_args("inventory set ansible_ssh_args", args)
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elif C.ANSIBLE_SSH_ARGS:
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args = self._split_args(C.ANSIBLE_SSH_ARGS)
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self.add_args("ansible.cfg set ssh_args", args)
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else:
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args = (
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"-o", "ControlMaster=auto",
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"-o", "ControlPersist=60s"
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)
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self.add_args("default arguments", 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_ssh_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 and user != pwd.getpwuid(os.geteuid())[0]:
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self.add_args(
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"ANSIBLE_REMOTE_USER/remote_user/ansible_ssh_user/user/-u set",
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("-o", "User={0}".format(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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# If any extra SSH arguments are specified in the inventory for
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# this host, or specified as an override on the command line,
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# add them in.
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if self._play_context.ssh_extra_args:
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args = self._split_args(self._play_context.ssh_extra_args)
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self.add_args("command-line added --ssh-extra-args", args)
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elif self.ssh_extra_args:
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args = self._split_args(self.ssh_extra_args)
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self.add_args("inventory added ansible_ssh_extra_args", args)
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# If ssh_args or ssh_extra_args set ControlPersist but not a
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# ControlPath, add one ourselves.
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cp_in_use = False
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cp_path_set = False
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for arg in self._command:
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if "ControlPersist" in arg:
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cp_in_use = True
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if "ControlPath" in arg:
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cp_path_set = True
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if cp_in_use and not cp_path_set:
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self._cp_dir = unfrackpath('$HOME/.ansible/cp')
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args = ("-o", "ControlPath={0}".format(
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C.ANSIBLE_SSH_CONTROL_PATH % dict(directory=self._cp_dir))
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)
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self.add_args("found only ControlPersist; added ControlPath", args)
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# The directory must exist and be writable.
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makedirs_safe(self._cp_dir, 0o700)
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if not os.access(self._cp_dir, os.W_OK):
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raise AnsibleError("Cannot write to ControlPath %s" % self._cp_dir)
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# If the configuration dictates that we use a persistent connection,
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# then we remember that for later. (We could be more thorough about
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# detecting this, though.)
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if cp_in_use:
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self._persistent = True
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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 exec_command(self, *args, **kwargs):
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"""
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Wrapper around _exec_command to retry in the case of an ssh failure
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Will retry if:
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* an exception is caught
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* ssh returns 255
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Will not retry if
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* remaining_tries is <2
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* retries limit reached
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"""
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remaining_tries = int(C.ANSIBLE_SSH_RETRIES) + 1
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cmd_summary = "%s..." % args[0]
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for attempt in xrange(remaining_tries):
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try:
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return_tuple = self._exec_command(*args, **kwargs)
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# 0 = success
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# 1-254 = remote command return code
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# 255 = failure from the ssh command itself
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if return_tuple[0] != 255 or attempt == (remaining_tries - 1):
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break
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else:
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raise AnsibleConnectionFailure("Failed to connect to the host via ssh.")
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except (AnsibleConnectionFailure, Exception) as e:
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if attempt == remaining_tries - 1:
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raise e
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else:
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pause = 2 ** attempt - 1
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if pause > 30:
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pause = 30
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if isinstance(e, AnsibleConnectionFailure):
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msg = "ssh_retry: attempt: %d, ssh return code is 255. cmd (%s), pausing for %d seconds" % (attempt, cmd_summary, pause)
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else:
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msg = "ssh_retry: attempt: %d, caught exception(%s) from cmd (%s), pausing for %d seconds" % (attempt, e, cmd_summary, pause)
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self._display.vv(msg)
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time.sleep(pause)
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continue
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return return_tuple
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def _exec_command(self, cmd, tmp_path, in_data=None, sudoable=True):
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''' run a command on the remote host '''
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super(Connection, self).exec_command(cmd, tmp_path, in_data=in_data, sudoable=sudoable)
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self._display.vvv("ESTABLISH SSH CONNECTION FOR USER: {0}".format(self._play_context.remote_user), host=self._play_context.remote_addr)
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# we can only use tty when we are not pipelining the modules. piping
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# data into /usr/bin/python inside a tty automatically invokes the
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# python interactive-mode but the modules are not compatible with the
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# interactive-mode ("unexpected indent" mainly because of empty lines)
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if in_data:
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cmd = self._build_command('ssh', self.host, cmd)
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else:
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cmd = self._build_command('ssh', '-tt', self.host, cmd)
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(returncode, stdout, stderr) = self._run(cmd, in_data, sudoable=sudoable)
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return (returncode, '', stdout, stderr)
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def put_file(self, in_path, out_path):
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''' transfer a file from local to remote '''
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super(Connection, self).put_file(in_path, out_path)
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self._display.vvv("PUT {0} TO {1}".format(in_path, out_path), host=self.host)
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if not os.path.exists(in_path):
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raise AnsibleFileNotFound("file or module does not exist: {0}".format(in_path))
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# scp and sftp require square brackets for IPv6 addresses, but
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# accept them for hostnames and IPv4 addresses too.
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host = '[%s]' % self.host
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if C.DEFAULT_SCP_IF_SSH:
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cmd = self._build_command('scp', in_path, '{0}:{1}'.format(host, pipes.quote(out_path)))
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in_data = None
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else:
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cmd = self._build_command('sftp', host)
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in_data = "put {0} {1}\n".format(pipes.quote(in_path), pipes.quote(out_path))
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(returncode, stdout, stderr) = self._run(cmd, in_data)
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if returncode != 0:
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raise AnsibleError("failed to transfer file to {0}:\n{1}\n{2}".format(out_path, stdout, stderr))
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def fetch_file(self, in_path, out_path):
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''' fetch a file from remote to local '''
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super(Connection, self).fetch_file(in_path, out_path)
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self._display.vvv("FETCH {0} TO {1}".format(in_path, out_path), host=self.host)
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# scp and sftp require square brackets for IPv6 addresses, but
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# accept them for hostnames and IPv4 addresses too.
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host = '[%s]' % self.host
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if C.DEFAULT_SCP_IF_SSH:
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cmd = self._build_command('scp', '{0}:{1}'.format(host, pipes.quote(in_path)), out_path)
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in_data = None
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else:
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cmd = self._build_command('sftp', host)
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in_data = "get {0} {1}\n".format(pipes.quote(in_path), pipes.quote(out_path))
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(returncode, stdout, stderr) = self._run(cmd, in_data)
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if returncode != 0:
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raise AnsibleError("failed to transfer file from {0}:\n{1}\n{2}".format(in_path, stdout, stderr))
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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(pipes.quote, cmd[:-1]) + [cmd[-1]]
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self._display.vvv('SSH: EXEC {0}'.format(' '.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. If we are pipelining data, or can't create a pty,
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# we fall back to using plain old pipes.
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p = None
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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:
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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 to the
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# 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(self._play_context.password))
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os.close(self.sshpass_pipe[1])
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# This section is specific to ssh:
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#
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# If we have a privilege escalation prompt, we need to look for the
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# prompt and send the password (but we won't be prompted if sudo has
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# NOPASSWD configured), then detect successful escalation (or handle
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# errors and timeouts).
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no_prompt_out = ''
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no_prompt_err = ''
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if self._play_context.prompt:
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self._display.debug("Handling privilege escalation password prompt.")
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fcntl.fcntl(p.stdout, fcntl.F_SETFL, fcntl.fcntl(p.stdout, fcntl.F_GETFL) | os.O_NONBLOCK)
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fcntl.fcntl(p.stderr, fcntl.F_SETFL, fcntl.fcntl(p.stderr, fcntl.F_GETFL) | os.O_NONBLOCK)
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become_output = ''
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become_errput = ''
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passprompt = False
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while True:
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self._display.debug('Waiting for Privilege Escalation input')
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if self.check_become_success(become_output + become_errput):
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self._display.debug('Succeded!')
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break
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elif self.check_password_prompt(become_output) or self.check_password_prompt(become_errput):
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self._display.debug('Password prompt!')
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passprompt = True
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break
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self._display.debug('Read next chunks')
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rfd, wfd, efd = select.select([p.stdout, p.stderr], [], [p.stdout], self._play_context.timeout)
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if not rfd:
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# timeout. wrap up process communication
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stdout, stderr = p.communicate()
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raise AnsibleError('Connection error waiting for privilege escalation password prompt: %s' % become_output)
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elif p.stderr in rfd:
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chunk = p.stderr.read()
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become_errput += chunk
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self._display.debug('stderr chunk is: %s' % chunk)
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self.check_incorrect_password(become_errput)
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elif p.stdout in rfd:
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chunk = p.stdout.read()
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become_output += chunk
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self._display.debug('stdout chunk is: %s' % chunk)
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if not chunk:
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break
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#raise AnsibleError('Connection closed waiting for privilege escalation password prompt: %s ' % become_output)
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if passprompt:
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self._display.debug("Sending privilege escalation password.")
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stdin.write(self._play_context.become_pass + '\n')
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else:
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no_prompt_out = become_output
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no_prompt_err = become_errput
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# Now we're back to common handling for ssh/scp/sftp. If we have any
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# data to write into the connection, we do it now. (But we can't use
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# p.communicate because the ControlMaster may have stdout open too.)
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fcntl.fcntl(p.stdout, fcntl.F_SETFL, fcntl.fcntl(p.stdout, fcntl.F_GETFL) & ~os.O_NONBLOCK)
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fcntl.fcntl(p.stderr, fcntl.F_SETFL, fcntl.fcntl(p.stderr, fcntl.F_GETFL) & ~os.O_NONBLOCK)
|
|
|
|
if in_data:
|
|
try:
|
|
stdin.write(in_data)
|
|
stdin.close()
|
|
except:
|
|
raise AnsibleConnectionFailure('SSH Error: data could not be sent to the remote host. Make sure this host can be reached over ssh')
|
|
|
|
# Now we just loop reading stdout/stderr from the process until it
|
|
# terminates.
|
|
|
|
stdout = stderr = ''
|
|
rpipes = [p.stdout, p.stderr]
|
|
|
|
while True:
|
|
rfd, wfd, efd = select.select(rpipes, [], rpipes, 1)
|
|
|
|
# fail early if the become password is wrong
|
|
if self._play_context.become and sudoable:
|
|
if self._play_context.become_pass:
|
|
self.check_incorrect_password(stdout)
|
|
elif self.check_password_prompt(stdout):
|
|
raise AnsibleError('Missing %s password' % self._play_context.become_method)
|
|
|
|
if p.stderr in rfd:
|
|
dat = os.read(p.stderr.fileno(), 9000)
|
|
stderr += dat
|
|
if dat == '':
|
|
rpipes.remove(p.stderr)
|
|
elif p.stdout in rfd:
|
|
dat = os.read(p.stdout.fileno(), 9000)
|
|
stdout += dat
|
|
if dat == '':
|
|
rpipes.remove(p.stdout)
|
|
|
|
# only break out if no pipes are left to read or
|
|
# the pipes are completely read and
|
|
# the process is terminated
|
|
if (not rpipes or not rfd) and p.poll() is not None:
|
|
break
|
|
# No pipes are left to read but process is not yet terminated
|
|
# Only then it is safe to wait for the process to be finished
|
|
# NOTE: Actually p.poll() is always None here if rpipes is empty
|
|
elif not rpipes and p.poll() == None:
|
|
p.wait()
|
|
# The process is terminated. Since no pipes to read from are
|
|
# left, there is no need to call select() again.
|
|
break
|
|
|
|
# close stdin after process is terminated and stdout/stderr are read
|
|
# completely (see also issue #848)
|
|
stdin.close()
|
|
|
|
controlpersisterror = 'Bad configuration option: ControlPersist' in stderr or 'unknown configuration option: ControlPersist' in stderr
|
|
|
|
if C.HOST_KEY_CHECKING:
|
|
if cmd[0] == "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.')
|
|
|
|
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')
|
|
# FIXME: module name isn't in runner
|
|
#if p.returncode == 255 and (in_data or self.runner.module_name == 'raw'):
|
|
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, no_prompt_out+stdout, no_prompt_err+stderr)
|
|
|
|
# Utility functions
|
|
|
|
def _split_args(self, argstring):
|
|
"""
|
|
Takes a string like '-o Foo=1 -o Bar="foo bar"' and returns a
|
|
list ['-o', 'Foo=1', '-o', 'Bar=foo bar'] that can be added to
|
|
the argument list. The list will not contain any empty elements.
|
|
"""
|
|
return [x.strip() for x in shlex.split(argstring) if x.strip()]
|
|
|
|
def add_args(self, explanation, args):
|
|
"""
|
|
Adds the given args to self._command and displays a caller-supplied
|
|
explanation of why they were added.
|
|
"""
|
|
self._command += args
|
|
self._display.vvvvv('SSH: ' + explanation + ': (%s)' % ')('.join(args), host=self._play_context.remote_addr)
|