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ansible/lib/ansible/plugins/connection/paramiko_ssh.py

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# (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>
# (c) 2017 Ansible Project
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
DOCUMENTATION = """
author: Ansible Core Team
connection: paramiko
short_description: Run tasks via python ssh (paramiko)
description:
- Use the python ssh implementation (Paramiko) to connect to targets
- The paramiko transport is provided because many distributions, in particular EL6 and before do not support ControlPersist
in their SSH implementations.
- This is needed on the Ansible control machine to be reasonably efficient with connections.
Thus paramiko is faster for most users on these platforms.
Users with ControlPersist capability can consider using -c ssh or configuring the transport in the configuration file.
- This plugin also borrows a lot of settings from the ssh plugin as they both cover the same protocol.
version_added: "0.1"
options:
remote_addr:
description:
- Address of the remote target
default: inventory_hostname
vars:
- name: ansible_host
- name: ansible_ssh_host
- name: ansible_paramiko_host
remote_user:
description:
- User to login/authenticate as
- Can be set from the CLI via the C(--user) or C(-u) options.
vars:
- name: ansible_user
- name: ansible_ssh_user
- name: ansible_paramiko_user
env:
- name: ANSIBLE_REMOTE_USER
- name: ANSIBLE_PARAMIKO_REMOTE_USER
version_added: '2.5'
ini:
- section: defaults
key: remote_user
- section: paramiko_connection
key: remote_user
version_added: '2.5'
password:
description:
- Secret used to either login the ssh server or as a passphrase for ssh keys that require it
- Can be set from the CLI via the C(--ask-pass) option.
vars:
- name: ansible_password
- name: ansible_ssh_pass
- name: ansible_ssh_password
- name: ansible_paramiko_pass
- name: ansible_paramiko_password
version_added: '2.5'
host_key_auto_add:
description: 'TODO: write it'
env: [{name: ANSIBLE_PARAMIKO_HOST_KEY_AUTO_ADD}]
ini:
- {key: host_key_auto_add, section: paramiko_connection}
type: boolean
look_for_keys:
default: True
description: 'TODO: write it'
env: [{name: ANSIBLE_PARAMIKO_LOOK_FOR_KEYS}]
ini:
- {key: look_for_keys, section: paramiko_connection}
type: boolean
proxy_command:
default: ''
description:
- Proxy information for running the connection via a jumphost
- Also this plugin will scan 'ssh_args', 'ssh_extra_args' and 'ssh_common_args' from the 'ssh' plugin settings for proxy information if set.
env: [{name: ANSIBLE_PARAMIKO_PROXY_COMMAND}]
ini:
- {key: proxy_command, section: paramiko_connection}
pty:
default: True
description: 'TODO: write it'
env:
- name: ANSIBLE_PARAMIKO_PTY
ini:
- section: paramiko_connection
key: pty
type: boolean
record_host_keys:
default: True
description: 'TODO: write it'
env: [{name: ANSIBLE_PARAMIKO_RECORD_HOST_KEYS}]
ini:
- section: paramiko_connection
key: record_host_keys
type: boolean
host_key_checking:
description: 'Set this to "False" if you want to avoid host key checking by the underlying tools Ansible uses to connect to the host'
type: boolean
default: True
env:
- name: ANSIBLE_HOST_KEY_CHECKING
- name: ANSIBLE_SSH_HOST_KEY_CHECKING
version_added: '2.5'
- name: ANSIBLE_PARAMIKO_HOST_KEY_CHECKING
version_added: '2.5'
ini:
- section: defaults
key: host_key_checking
- section: paramiko_connection
key: host_key_checking
version_added: '2.5'
vars:
- name: ansible_host_key_checking
version_added: '2.5'
- name: ansible_ssh_host_key_checking
version_added: '2.5'
- name: ansible_paramiko_host_key_checking
version_added: '2.5'
use_persistent_connections:
description: 'Toggles the use of persistence for connections'
type: boolean
default: False
env:
- name: ANSIBLE_USE_PERSISTENT_CONNECTIONS
ini:
- section: defaults
key: use_persistent_connections
# TODO:
#timeout=self._play_context.timeout,
"""
import warnings
import os
import socket
import tempfile
import traceback
import fcntl
import sys
import re
from termios import tcflush, TCIFLUSH
from distutils.version import LooseVersion
from binascii import hexlify
from ansible import constants as C
from ansible.errors import (
AnsibleAuthenticationFailure,
AnsibleConnectionFailure,
AnsibleError,
AnsibleFileNotFound,
)
from ansible.module_utils.compat.paramiko import PARAMIKO_IMPORT_ERR, paramiko
from ansible.module_utils.six import iteritems
from ansible.module_utils.six.moves import input
from ansible.plugins.connection import ConnectionBase
from ansible.utils.display import Display
from ansible.utils.path import makedirs_safe
from ansible.module_utils._text import to_bytes, to_native, to_text
display = Display()
AUTHENTICITY_MSG = """
paramiko: The authenticity of host '%s' can't be established.
The %s key fingerprint is %s.
Are you sure you want to continue connecting (yes/no)?
"""
# SSH Options Regex
SETTINGS_REGEX = re.compile(r'(\w+)(?:\s*=\s*|\s+)(.+)')
class MyAddPolicy(object):
"""
Based on AutoAddPolicy in paramiko so we can determine when keys are added
and also prompt for input.
Policy for automatically adding the hostname and new host key to the
local L{HostKeys} object, and saving it. This is used by L{SSHClient}.
"""
def __init__(self, new_stdin, connection):
self._new_stdin = new_stdin
self.connection = connection
self._options = connection._options
def missing_host_key(self, client, hostname, key):
if all((self._options['host_key_checking'], not self._options['host_key_auto_add'])):
fingerprint = hexlify(key.get_fingerprint())
ktype = key.get_name()
if self.connection.get_option('use_persistent_connections') or self.connection.force_persistence:
# don't print the prompt string since the user cannot respond
# to the question anyway
raise AnsibleError(AUTHENTICITY_MSG[1:92] % (hostname, ktype, fingerprint))
self.connection.connection_lock()
old_stdin = sys.stdin
sys.stdin = self._new_stdin
# clear out any premature input on sys.stdin
tcflush(sys.stdin, TCIFLUSH)
inp = input(AUTHENTICITY_MSG % (hostname, ktype, fingerprint))
sys.stdin = old_stdin
self.connection.connection_unlock()
if inp not in ['yes', 'y', '']:
raise AnsibleError("host connection rejected by user")
key._added_by_ansible_this_time = True
# existing implementation below:
client._host_keys.add(hostname, key.get_name(), key)
# host keys are actually saved in close() function below
# in order to control ordering.
# keep connection objects on a per host basis to avoid repeated attempts to reconnect
SSH_CONNECTION_CACHE = {}
SFTP_CONNECTION_CACHE = {}
class Connection(ConnectionBase):
''' SSH based connections with Paramiko '''
transport = 'paramiko'
_log_channel = None
def _cache_key(self):
return "%s__%s__" % (self._play_context.remote_addr, self._play_context.remote_user)
def _connect(self):
cache_key = self._cache_key()
if cache_key in SSH_CONNECTION_CACHE:
self.ssh = SSH_CONNECTION_CACHE[cache_key]
else:
self.ssh = SSH_CONNECTION_CACHE[cache_key] = self._connect_uncached()
return self
def _set_log_channel(self, name):
'''Mimic paramiko.SSHClient.set_log_channel'''
self._log_channel = name
def _parse_proxy_command(self, port=22):
proxy_command = None
# Parse ansible_ssh_common_args, specifically looking for ProxyCommand
ssh_args = [
getattr(self._play_context, 'ssh_extra_args', '') or '',
getattr(self._play_context, 'ssh_common_args', '') or '',
getattr(self._play_context, 'ssh_args', '') or '',
]
if ssh_args is not None:
args = self._split_ssh_args(' '.join(ssh_args))
for i, arg in enumerate(args):
if arg.lower() == 'proxycommand':
# _split_ssh_args split ProxyCommand from the command itself
proxy_command = args[i + 1]
else:
# ProxyCommand and the command itself are a single string
match = SETTINGS_REGEX.match(arg)
if match:
if match.group(1).lower() == 'proxycommand':
proxy_command = match.group(2)
if proxy_command:
break
proxy_command = proxy_command or self.get_option('proxy_command')
sock_kwarg = {}
if proxy_command:
replacers = {
'%h': self._play_context.remote_addr,
'%p': port,
'%r': self._play_context.remote_user
}
for find, replace in replacers.items():
proxy_command = proxy_command.replace(find, str(replace))
try:
sock_kwarg = {'sock': paramiko.ProxyCommand(proxy_command)}
display.vvv("CONFIGURE PROXY COMMAND FOR CONNECTION: %s" % proxy_command, host=self._play_context.remote_addr)
except AttributeError:
display.warning('Paramiko ProxyCommand support unavailable. '
'Please upgrade to Paramiko 1.9.0 or newer. '
'Not using configured ProxyCommand')
return sock_kwarg
def _connect_uncached(self):
''' activates the connection object '''
if paramiko is None:
raise AnsibleError("paramiko is not installed: %s" % to_native(PARAMIKO_IMPORT_ERR))
port = self._play_context.port or 22
display.vvv("ESTABLISH PARAMIKO SSH CONNECTION FOR USER: %s on PORT %s TO %s" % (self._play_context.remote_user, port, self._play_context.remote_addr),
host=self._play_context.remote_addr)
ssh = paramiko.SSHClient()
# override paramiko's default logger name
if self._log_channel is not None:
ssh.set_log_channel(self._log_channel)
self.keyfile = os.path.expanduser("~/.ssh/known_hosts")
if self.get_option('host_key_checking'):
for ssh_known_hosts in ("/etc/ssh/ssh_known_hosts", "/etc/openssh/ssh_known_hosts"):
try:
# TODO: check if we need to look at several possible locations, possible for loop
ssh.load_system_host_keys(ssh_known_hosts)
break
except IOError:
pass # file was not found, but not required to function
ssh.load_system_host_keys()
ssh_connect_kwargs = self._parse_proxy_command(port)
ssh.set_missing_host_key_policy(MyAddPolicy(self._new_stdin, self))
allow_agent = True
if self._play_context.password is not None:
allow_agent = False
try:
key_filename = None
if self._play_context.private_key_file:
key_filename = os.path.expanduser(self._play_context.private_key_file)
# paramiko 2.2 introduced auth_timeout parameter
if LooseVersion(paramiko.__version__) >= LooseVersion('2.2.0'):
ssh_connect_kwargs['auth_timeout'] = self._play_context.timeout
ssh.connect(
self._play_context.remote_addr.lower(),
username=self._play_context.remote_user,
allow_agent=allow_agent,
look_for_keys=self.get_option('look_for_keys'),
key_filename=key_filename,
password=self._play_context.password,
timeout=self._play_context.timeout,
port=port,
**ssh_connect_kwargs
)
except paramiko.ssh_exception.BadHostKeyException as e:
raise AnsibleConnectionFailure('host key mismatch for %s' % e.hostname)
except paramiko.ssh_exception.AuthenticationException as e:
msg = 'Invalid/incorrect username/password. {0}'.format(to_text(e))
raise AnsibleAuthenticationFailure(msg)
except Exception as e:
msg = to_text(e)
if u"PID check failed" in msg:
raise AnsibleError("paramiko version issue, please upgrade paramiko on the machine running ansible")
elif u"Private key file is encrypted" in msg:
msg = 'ssh %s@%s:%s : %s\nTo connect as a different user, use -u <username>.' % (
self._play_context.remote_user, self._play_context.remote_addr, port, msg)
raise AnsibleConnectionFailure(msg)
else:
raise AnsibleConnectionFailure(msg)
return ssh
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)
if in_data:
raise AnsibleError("Internal Error: this module does not support optimized module pipelining")
bufsize = 4096
try:
self.ssh.get_transport().set_keepalive(5)
chan = self.ssh.get_transport().open_session()
except Exception as e:
text_e = to_text(e)
msg = u"Failed to open session"
if text_e:
msg += u": %s" % text_e
raise AnsibleConnectionFailure(to_native(msg))
# sudo usually requires a PTY (cf. requiretty option), therefore
# we give it one by default (pty=True in ansible.cfg), and we try
# to initialise from the calling environment when sudoable is enabled
if self.get_option('pty') and sudoable:
chan.get_pty(term=os.getenv('TERM', 'vt100'), width=int(os.getenv('COLUMNS', 0)), height=int(os.getenv('LINES', 0)))
display.vvv("EXEC %s" % cmd, host=self._play_context.remote_addr)
cmd = to_bytes(cmd, errors='surrogate_or_strict')
no_prompt_out = b''
no_prompt_err = b''
become_output = b''
try:
chan.exec_command(cmd)
if self.become and self.become.expect_prompt():
passprompt = False
become_sucess = False
while not (become_sucess or passprompt):
display.debug('Waiting for Privilege Escalation input')
chunk = chan.recv(bufsize)
display.debug("chunk is: %s" % chunk)
if not chunk:
if b'unknown user' in become_output:
raise AnsibleError('user %s does not exist' % self._play_context.become_user)
else:
break
# raise AnsibleError('ssh connection closed waiting for password prompt')
become_output += chunk
# need to check every line because we might get lectured
# and we might get the middle of a line in a chunk
for l in become_output.splitlines(True):
if self.become.check_success(l):
become_sucess = True
break
elif self.become.check_password_prompt(l):
passprompt = True
break
if passprompt:
if self._play_context.become and self._play_context.become_pass:
chan.sendall(to_bytes(self._play_context.become_pass) + b'\n')
else:
raise AnsibleError("A password is required but none was supplied")
else:
no_prompt_out += become_output
no_prompt_err += become_output
except socket.timeout:
raise AnsibleError('ssh timed out waiting for privilege escalation.\n' + become_output)
stdout = b''.join(chan.makefile('rb', bufsize))
stderr = b''.join(chan.makefile_stderr('rb', bufsize))
return (chan.recv_exit_status(), no_prompt_out + stdout, no_prompt_out + stderr)
def put_file(self, in_path, out_path):
''' transfer a file from local to remote '''
super(Connection, self).put_file(in_path, out_path)
display.vvv("PUT %s TO %s" % (in_path, out_path), host=self._play_context.remote_addr)
if not os.path.exists(to_bytes(in_path, errors='surrogate_or_strict')):
raise AnsibleFileNotFound("file or module does not exist: %s" % in_path)
try:
self.sftp = self.ssh.open_sftp()
except Exception as e:
raise AnsibleError("failed to open a SFTP connection (%s)" % e)
try:
self.sftp.put(to_bytes(in_path, errors='surrogate_or_strict'), to_bytes(out_path, errors='surrogate_or_strict'))
except IOError:
raise AnsibleError("failed to transfer file to %s" % out_path)
def _connect_sftp(self):
cache_key = "%s__%s__" % (self._play_context.remote_addr, self._play_context.remote_user)
if cache_key in SFTP_CONNECTION_CACHE:
return SFTP_CONNECTION_CACHE[cache_key]
else:
result = SFTP_CONNECTION_CACHE[cache_key] = self._connect().ssh.open_sftp()
return result
def fetch_file(self, in_path, out_path):
''' save a remote file to the specified path '''
super(Connection, self).fetch_file(in_path, out_path)
display.vvv("FETCH %s TO %s" % (in_path, out_path), host=self._play_context.remote_addr)
try:
self.sftp = self._connect_sftp()
except Exception as e:
raise AnsibleError("failed to open a SFTP connection (%s)" % to_native(e))
try:
self.sftp.get(to_bytes(in_path, errors='surrogate_or_strict'), to_bytes(out_path, errors='surrogate_or_strict'))
except IOError:
raise AnsibleError("failed to transfer file from %s" % in_path)
def _any_keys_added(self):
for hostname, keys in iteritems(self.ssh._host_keys):
for keytype, key in iteritems(keys):
added_this_time = getattr(key, '_added_by_ansible_this_time', False)
if added_this_time:
return True
return False
def _save_ssh_host_keys(self, filename):
'''
not using the paramiko save_ssh_host_keys function as we want to add new SSH keys at the bottom so folks
don't complain about it :)
'''
if not self._any_keys_added():
return False
path = os.path.expanduser("~/.ssh")
makedirs_safe(path)
f = open(filename, 'w')
for hostname, keys in iteritems(self.ssh._host_keys):
for keytype, key in iteritems(keys):
# was f.write
added_this_time = getattr(key, '_added_by_ansible_this_time', False)
if not added_this_time:
f.write("%s %s %s\n" % (hostname, keytype, key.get_base64()))
for hostname, keys in iteritems(self.ssh._host_keys):
for keytype, key in iteritems(keys):
added_this_time = getattr(key, '_added_by_ansible_this_time', False)
if added_this_time:
f.write("%s %s %s\n" % (hostname, keytype, key.get_base64()))
f.close()
def reset(self):
self.close()
self._connect()
def close(self):
''' terminate the connection '''
cache_key = self._cache_key()
SSH_CONNECTION_CACHE.pop(cache_key, None)
SFTP_CONNECTION_CACHE.pop(cache_key, None)
if hasattr(self, 'sftp'):
if self.sftp is not None:
self.sftp.close()
if self.get_option('host_key_checking') and self.get_option('record_host_keys') and self._any_keys_added():
# add any new SSH host keys -- warning -- this could be slow
# (This doesn't acquire the connection lock because it needs
# to exclude only other known_hosts writers, not connections
# that are starting up.)
lockfile = self.keyfile.replace("known_hosts", ".known_hosts.lock")
dirname = os.path.dirname(self.keyfile)
makedirs_safe(dirname)
KEY_LOCK = open(lockfile, 'w')
fcntl.lockf(KEY_LOCK, fcntl.LOCK_EX)
try:
# just in case any were added recently
self.ssh.load_system_host_keys()
self.ssh._host_keys.update(self.ssh._system_host_keys)
# gather information about the current key file, so
# we can ensure the new file has the correct mode/owner
key_dir = os.path.dirname(self.keyfile)
if os.path.exists(self.keyfile):
key_stat = os.stat(self.keyfile)
mode = key_stat.st_mode
uid = key_stat.st_uid
gid = key_stat.st_gid
else:
mode = 33188
uid = os.getuid()
gid = os.getgid()
# Save the new keys to a temporary file and move it into place
# rather than rewriting the file. We set delete=False because
# the file will be moved into place rather than cleaned up.
tmp_keyfile = tempfile.NamedTemporaryFile(dir=key_dir, delete=False)
os.chmod(tmp_keyfile.name, mode & 0o7777)
os.chown(tmp_keyfile.name, uid, gid)
self._save_ssh_host_keys(tmp_keyfile.name)
tmp_keyfile.close()
os.rename(tmp_keyfile.name, self.keyfile)
except Exception:
# unable to save keys, including scenario when key was invalid
# and caught earlier
traceback.print_exc()
fcntl.lockf(KEY_LOCK, fcntl.LOCK_UN)
self.ssh.close()
self._connected = False
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