463 lines
20 KiB
Python
463 lines
20 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 os
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import re
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import subprocess
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import shlex
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import pipes
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import random
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import select
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import fcntl
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import hmac
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import pwd
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import gettext
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import pty
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from hashlib import sha1
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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.connections import ConnectionBase
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class Connection(ConnectionBase):
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''' ssh based connections '''
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def __init__(self, *args, **kwargs):
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# SSH connection specific init stuff
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self.HASHED_KEY_MAGIC = "|1|"
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self._has_pipelining = True
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# FIXME: move the lockfile locations to ActionBase?
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#fcntl.lockf(self.runner.process_lockfile, fcntl.LOCK_EX)
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#self.cp_dir = utils.prepare_writeable_dir('$HOME/.ansible/cp',mode=0700)
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self._cp_dir = '/tmp'
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#fcntl.lockf(self.runner.process_lockfile, fcntl.LOCK_UN)
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super(Connection, self).__init__(*args, **kwargs)
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@property
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def transport(self):
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''' used to identify this connection object from other classes '''
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return 'ssh'
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def _connect(self):
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''' connect to the remote host '''
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self._display.vvv("ESTABLISH SSH CONNECTION FOR USER: {0}".format(self._connection_info.remote_user), host=self._connection_info.remote_addr)
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if self._connected:
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return self
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self._common_args = []
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extra_args = C.ANSIBLE_SSH_ARGS
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if extra_args is not None:
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# make sure there is no empty string added as this can produce weird errors
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self._common_args += [x.strip() for x in shlex.split(extra_args) if x.strip()]
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else:
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self._common_args += (
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"-o", "ControlMaster=auto",
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"-o", "ControlPersist=60s",
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"-o", "ControlPath=\"{0}\"".format(C.ANSIBLE_SSH_CONTROL_PATH % dict(directory=self._cp_dir)),
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)
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cp_in_use = False
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cp_path_set = False
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for arg in self._common_args:
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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._common_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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if not C.HOST_KEY_CHECKING:
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self._common_args += ("-o", "StrictHostKeyChecking=no")
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if self._connection_info.port is not None:
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self._common_args += ("-o", "Port={0}".format(self._connection_info.port))
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# FIXME: need to get this from connection info
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#if self.private_key_file is not None:
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# self._common_args += ("-o", "IdentityFile=\"{0}\"".format(os.path.expanduser(self.private_key_file)))
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#elif self.runner.private_key_file is not None:
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# self._common_args += ("-o", "IdentityFile=\"{0}\"".format(os.path.expanduser(self.runner.private_key_file)))
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if self._connection_info.password:
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self._common_args += ("-o", "GSSAPIAuthentication=no",
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"-o", "PubkeyAuthentication=no")
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else:
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self._common_args += ("-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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if self._connection_info.remote_user is not None and self._connection_info.remote_user != pwd.getpwuid(os.geteuid())[0]:
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self._common_args += ("-o", "User={0}".format(self._connection_info.remote_user))
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# FIXME: figure out where this goes
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#self._common_args += ("-o", "ConnectTimeout={0}".format(self.runner.timeout))
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self._common_args += ("-o", "ConnectTimeout=15")
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self._connected = True
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return self
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def _run(self, cmd, indata):
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if indata:
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# do not use pseudo-pty
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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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else:
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# try to use upseudo-pty
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try:
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# Make sure stdin is a proper (pseudo) 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 = subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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stdin = p.stdin
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return (p, stdin)
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def _password_cmd(self):
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if self._connection_info.password:
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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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except OSError:
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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.rfd, self.wfd) = os.pipe()
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return ("sshpass", "-d{0}".format(self.rfd))
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return []
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def _send_password(self):
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if self._connection_info.password:
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os.close(self.rfd)
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os.write(self.wfd, "{0}\n".format(self._connection_info.password))
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os.close(self.wfd)
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def _communicate(self, p, stdin, indata, su=False, sudoable=False, prompt=None):
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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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# We can't use p.communicate here because the ControlMaster may have stdout open as well
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stdout = ''
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stderr = ''
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rpipes = [p.stdout, p.stderr]
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if indata:
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try:
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stdin.write(indata)
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stdin.close()
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except:
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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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# Read stdout/stderr from process
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while True:
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rfd, wfd, efd = select.select(rpipes, [], rpipes, 1)
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# FIXME: su/sudo stuff
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# fail early if the sudo/su password is wrong
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#if self.runner.sudo and sudoable:
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# if self.runner.sudo_pass:
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# incorrect_password = gettext.dgettext(
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# "sudo", "Sorry, try again.")
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# if stdout.endswith("%s\r\n%s" % (incorrect_password,
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# prompt)):
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# raise AnsibleError('Incorrect sudo password')
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#
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# if stdout.endswith(prompt):
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# raise AnsibleError('Missing sudo password')
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#
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#if self.runner.su and su and self.runner.su_pass:
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# incorrect_password = gettext.dgettext(
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# "su", "Sorry")
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# if stdout.endswith("%s\r\n%s" % (incorrect_password, prompt)):
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# raise AnsibleError('Incorrect su password')
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if p.stdout in rfd:
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dat = os.read(p.stdout.fileno(), 9000)
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stdout += dat
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if dat == '':
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rpipes.remove(p.stdout)
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if p.stderr in rfd:
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dat = os.read(p.stderr.fileno(), 9000)
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stderr += dat
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if dat == '':
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rpipes.remove(p.stderr)
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# only break out if no pipes are left to read or
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# the pipes are completely read and
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# the process is terminated
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if (not rpipes or not rfd) and p.poll() is not None:
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break
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# No pipes are left to read but process is not yet terminated
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# Only then it is safe to wait for the process to be finished
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# NOTE: Actually p.poll() is always None here if rpipes is empty
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elif not rpipes and p.poll() == None:
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p.wait()
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# The process is terminated. Since no pipes to read from are
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# left, there is no need to call select() again.
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break
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# close stdin after process is terminated and stdout/stderr are read
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# completely (see also issue #848)
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stdin.close()
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return (p.returncode, stdout, stderr)
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def not_in_host_file(self, host):
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if 'USER' in os.environ:
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user_host_file = os.path.expandvars("~${USER}/.ssh/known_hosts")
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else:
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user_host_file = "~/.ssh/known_hosts"
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user_host_file = os.path.expanduser(user_host_file)
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host_file_list = []
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host_file_list.append(user_host_file)
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host_file_list.append("/etc/ssh/ssh_known_hosts")
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host_file_list.append("/etc/ssh/ssh_known_hosts2")
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hfiles_not_found = 0
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for hf in host_file_list:
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if not os.path.exists(hf):
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hfiles_not_found += 1
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continue
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try:
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host_fh = open(hf)
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except IOError as e:
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hfiles_not_found += 1
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continue
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else:
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data = host_fh.read()
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host_fh.close()
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for line in data.split("\n"):
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if line is None or " " not in line:
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continue
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tokens = line.split()
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if not tokens:
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continue
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if tokens[0].find(self.HASHED_KEY_MAGIC) == 0:
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# this is a hashed known host entry
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try:
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(kn_salt,kn_host) = tokens[0][len(self.HASHED_KEY_MAGIC):].split("|",2)
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hash = hmac.new(kn_salt.decode('base64'), digestmod=sha1)
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hash.update(host)
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if hash.digest() == kn_host.decode('base64'):
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return False
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except:
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# invalid hashed host key, skip it
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continue
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else:
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# standard host file entry
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if host in tokens[0]:
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return False
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if (hfiles_not_found == len(host_file_list)):
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self._display.vvv("EXEC previous known host file not found for {0}".format(host))
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return True
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def exec_command(self, cmd, tmp_path, executable='/bin/sh', in_data=None):
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''' run a command on the remote host '''
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ssh_cmd = self._password_cmd()
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ssh_cmd += ("ssh", "-C")
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if not in_data:
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# we can only use tty when we are not pipelining the modules. piping data into /usr/bin/python
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# inside a tty automatically invokes the python interactive-mode but the modules are not
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# compatible with the interactive-mode ("unexpected indent" mainly because of empty lines)
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ssh_cmd.append("-tt")
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if self._connection_info.verbosity > 3:
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ssh_cmd.append("-vvv")
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else:
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ssh_cmd.append("-q")
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ssh_cmd += self._common_args
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# FIXME: ipv6 stuff needs to be figured out. It's in the connection info, however
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# not sure if it's all working yet so this remains commented out
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#if self._ipv6:
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# ssh_cmd += ['-6']
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ssh_cmd.append(self._connection_info.remote_addr)
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ssh_cmd.append(cmd)
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self._display.vvv("EXEC {0}".format(' '.join(ssh_cmd)), host=self._connection_info.remote_addr)
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not_in_host_file = self.not_in_host_file(self._connection_info.remote_addr)
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# FIXME: move the locations of these lock files, same as init above
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#if C.HOST_KEY_CHECKING and not_in_host_file:
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# # lock around the initial SSH connectivity so the user prompt about whether to add
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# # the host to known hosts is not intermingled with multiprocess output.
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# fcntl.lockf(self.runner.process_lockfile, fcntl.LOCK_EX)
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# fcntl.lockf(self.runner.output_lockfile, fcntl.LOCK_EX)
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# create process
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(p, stdin) = self._run(ssh_cmd, in_data)
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self._send_password()
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no_prompt_out = ''
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no_prompt_err = ''
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# FIXME: su/sudo stuff
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#if (self.runner.sudo and sudoable and self.runner.sudo_pass) or \
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# (self.runner.su and su and self.runner.su_pass):
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# # several cases are handled for sudo privileges with password
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# # * NOPASSWD (tty & no-tty): detect success_key on stdout
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# # * without NOPASSWD:
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# # * detect prompt on stdout (tty)
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# # * detect prompt on stderr (no-tty)
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# fcntl.fcntl(p.stdout, fcntl.F_SETFL,
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# fcntl.fcntl(p.stdout, fcntl.F_GETFL) | os.O_NONBLOCK)
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# fcntl.fcntl(p.stderr, fcntl.F_SETFL,
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# fcntl.fcntl(p.stderr, fcntl.F_GETFL) | os.O_NONBLOCK)
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# sudo_output = ''
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# sudo_errput = ''
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#
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# while True:
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# if success_key in sudo_output or \
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# (self.runner.sudo_pass and sudo_output.endswith(prompt)) or \
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# (self.runner.su_pass and utils.su_prompts.check_su_prompt(sudo_output)):
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# break
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#
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# rfd, wfd, efd = select.select([p.stdout, p.stderr], [],
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# [p.stdout], self.runner.timeout)
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# if p.stderr in rfd:
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# chunk = p.stderr.read()
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# if not chunk:
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# raise AnsibleError('ssh connection closed waiting for sudo or su password prompt')
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# sudo_errput += chunk
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# incorrect_password = gettext.dgettext(
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# "sudo", "Sorry, try again.")
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# if sudo_errput.strip().endswith("%s%s" % (prompt, incorrect_password)):
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# raise AnsibleError('Incorrect sudo password')
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# elif sudo_errput.endswith(prompt):
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# stdin.write(self.runner.sudo_pass + '\n')
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#
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# if p.stdout in rfd:
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# chunk = p.stdout.read()
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# if not chunk:
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# raise AnsibleError('ssh connection closed waiting for sudo or su password prompt')
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# sudo_output += chunk
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#
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# if not rfd:
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# # timeout. wrap up process communication
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# stdout = p.communicate()
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# raise AnsibleError('ssh connection error waiting for sudo or su password prompt')
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#
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# if success_key not in sudo_output:
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# if sudoable:
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# stdin.write(self.runner.sudo_pass + '\n')
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# elif su:
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# stdin.write(self.runner.su_pass + '\n')
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# else:
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# no_prompt_out += sudo_output
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# no_prompt_err += sudo_errput
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#(returncode, stdout, stderr) = self._communicate(p, stdin, in_data, su=su, sudoable=sudoable, prompt=prompt)
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# FIXME: the prompt won't be here anymore
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prompt=""
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(returncode, stdout, stderr) = self._communicate(p, stdin, in_data, prompt=prompt)
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#if C.HOST_KEY_CHECKING and not_in_host_file:
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# # lock around the initial SSH connectivity so the user prompt about whether to add
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# # the host to known hosts is not intermingled with multiprocess output.
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# fcntl.lockf(self.runner.output_lockfile, fcntl.LOCK_UN)
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# fcntl.lockf(self.runner.process_lockfile, fcntl.LOCK_UN)
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controlpersisterror = 'Bad configuration option: ControlPersist' in stderr or 'unknown configuration option: ControlPersist' in stderr
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if C.HOST_KEY_CHECKING:
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if ssh_cmd[0] == "sshpass" and p.returncode == 6:
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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.')
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if p.returncode != 0 and controlpersisterror:
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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')
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# FIXME: module name isn't in runner
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#if p.returncode == 255 and (in_data or self.runner.module_name == 'raw'):
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if p.returncode == 255 and in_data:
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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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return (p.returncode, '', no_prompt_out + stdout, no_prompt_err + 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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self._display.vvv("PUT {0} TO {1}".format(in_path, out_path), host=self._connection_info.remote_addr)
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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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cmd = self._password_cmd()
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# FIXME: make a function, used in all 3 methods EXEC/PUT/FETCH
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host = self._connection_info.remote_addr
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# FIXME: ipv6 stuff needs to be figured out. It's in the connection info, however
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# not sure if it's all working yet so this remains commented out
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#if self._ipv6:
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# host = '[%s]' % host
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if C.DEFAULT_SCP_IF_SSH:
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cmd.append('scp')
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cmd += self._common_args
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cmd.append(in_path,host + ":" + pipes.quote(out_path))
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indata = None
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else:
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cmd.append('sftp')
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cmd += self._common_args
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cmd.append(host)
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indata = "put {0} {1}\n".format(pipes.quote(in_path), pipes.quote(out_path))
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(p, stdin) = self._run(cmd, indata)
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self._send_password()
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(returncode, stdout, stderr) = self._communicate(p, stdin, indata)
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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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self._display.vvv("FETCH {0} TO {1}".format(in_path, out_path), host=self._connection_info.remote_addr)
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cmd = self._password_cmd()
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# FIXME: make a function, used in all 3 methods EXEC/PUT/FETCH
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host = self._connection_info.remote_addr
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# FIXME: ipv6 stuff needs to be figured out. It's in the connection info, however
|
|
# not sure if it's all working yet so this remains commented out
|
|
#if self._ipv6:
|
|
# host = '[%s]' % self._connection_info.remote_addr
|
|
|
|
if C.DEFAULT_SCP_IF_SSH:
|
|
cmd.append('scp')
|
|
cmd += self._common_args
|
|
cmd += ('{0}:{1}'.format(host, in_path), out_path)
|
|
indata = None
|
|
else:
|
|
cmd.append('sftp')
|
|
cmd += self._common_args
|
|
cmd.append(host)
|
|
indata = "get {0} {1}\n".format(in_path, out_path)
|
|
|
|
p = subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
|
|
self._send_password()
|
|
stdout, stderr = p.communicate(indata)
|
|
|
|
if p.returncode != 0:
|
|
raise AnsibleError("failed to transfer file from {0}:\n{1}\n{2}".format(in_path, stdout, stderr))
|
|
|
|
def close(self):
|
|
''' not applicable since we're executing openssh binaries '''
|
|
self._connected = False
|
|
|