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3aac187387
Due to various inconsistencies of ssh and sftp regarding ipv6 and ipv4 handling, some special arguments must be passed, and the ipv6 must be passed in a specific format.
287 lines
11 KiB
Python
287 lines
11 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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import os
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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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from hashlib import sha1
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import ansible.constants as C
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from ansible.callbacks import vvv
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from ansible import errors
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from ansible import utils
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class Connection(object):
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''' ssh based connections '''
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def __init__(self, runner, host, port, user, password, private_key_file, *args, **kwargs):
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self.runner = runner
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self.host = host
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self.ipv6 = ':' in self.host
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self.port = port
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self.user = user
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self.password = password
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self.private_key_file = private_key_file
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self.HASHED_KEY_MAGIC = "|1|"
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def connect(self):
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''' connect to the remote host '''
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vvv("ESTABLISH CONNECTION FOR USER: %s" % self.user, host=self.host)
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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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self.common_args += shlex.split(extra_args)
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else:
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self.common_args += ["-o", "ControlMaster=auto",
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"-o", "ControlPersist=60s",
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"-o", "ControlPath=/tmp/ansible-ssh-%h-%p-%r"]
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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.port is not None:
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self.common_args += ["-o", "Port=%d" % (self.port)]
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if self.private_key_file is not None:
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self.common_args += ["-o", "IdentityFile="+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="+os.path.expanduser(self.runner.private_key_file)]
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if self.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", "PasswordAuthentication=no"]
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if self.user != pwd.getpwuid(os.geteuid())[0]:
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self.common_args += ["-o", "User="+self.user]
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self.common_args += ["-o", "ConnectTimeout=%d" % self.runner.timeout]
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return self
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def _password_cmd(self):
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if self.password:
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try:
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p = subprocess.Popen(["sshpass"], stdin=subprocess.PIPE,
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stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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p.communicate()
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except OSError:
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raise errors.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%d" % self.rfd]
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return []
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def _send_password(self):
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if self.password:
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os.close(self.rfd)
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os.write(self.wfd, "%s\n" % self.password)
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os.close(self.wfd)
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def not_in_host_file(self, host):
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host_file = os.path.expanduser("~/.ssh/known_hosts")
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if not os.path.exists(host_file):
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print "previous known host file not found"
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return True
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host_fh = open(host_file)
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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 line.find(" ") == -1:
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continue
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tokens = line.split()
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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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return True
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def exec_command(self, cmd, tmp_path, sudo_user,sudoable=False, executable='/bin/sh'):
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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", "-tt", "-q"] + self.common_args
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if self.ipv6:
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ssh_cmd += ['-6']
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ssh_cmd += [self.host]
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if not self.runner.sudo or not sudoable:
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if executable:
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ssh_cmd.append(executable + ' -c ' + pipes.quote(cmd))
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else:
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ssh_cmd.append(cmd)
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else:
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sudocmd, prompt = utils.make_sudo_cmd(sudo_user, executable, cmd)
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ssh_cmd.append(sudocmd)
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vvv("EXEC %s" % ssh_cmd, host=self.host)
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not_in_host_file = self.not_in_host_file(self.host)
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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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try:
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# Make sure stdin is a proper (pseudo) pty to avoid: tcgetattr errors
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import pty
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master, slave = pty.openpty()
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p = subprocess.Popen(ssh_cmd, stdin=slave,
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stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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stdin = os.fdopen(master, 'w', 0)
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except:
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p = subprocess.Popen(ssh_cmd, stdin=subprocess.PIPE,
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stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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stdin = p.stdin
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self._send_password()
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if self.runner.sudo and sudoable and self.runner.sudo_pass:
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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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sudo_output = ''
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while not sudo_output.endswith(prompt):
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rfd, wfd, efd = select.select([p.stdout], [],
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[p.stdout], self.runner.timeout)
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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 errors.AnsibleError('ssh connection closed waiting for sudo password prompt')
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sudo_output += chunk
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else:
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stdout = p.communicate()
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raise errors.AnsibleError('ssh connection error waiting for sudo password prompt')
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stdin.write(self.runner.sudo_pass + '\n')
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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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# 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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while True:
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rfd, wfd, efd = select.select([p.stdout, p.stderr], [], [p.stdout, p.stderr], 1)
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# fail early if the sudo password is wrong
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if self.runner.sudo and sudoable and 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, prompt)):
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raise errors.AnsibleError('Incorrect sudo 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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p.wait()
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break
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elif 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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p.wait()
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break
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elif p.poll() is not None:
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break
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stdin.close() # close stdin after we read from stdout (see also issue #848)
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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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if p.returncode != 0 and stderr.find('Bad configuration option: ControlPersist') != -1:
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raise errors.AnsibleError('using -c ssh on certain older ssh versions may not support ControlPersist, set ANSIBLE_SSH_ARGS="" (or ansible_ssh_args in the config file) before running again')
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return (p.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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vvv("PUT %s TO %s" % (in_path, out_path), host=self.host)
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if not os.path.exists(in_path):
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raise errors.AnsibleFileNotFound("file or module does not exist: %s" % in_path)
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cmd = self._password_cmd()
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host = self.host
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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 += ["scp"] + self.common_args
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cmd += [in_path,host + ":" + pipes.quote(out_path)]
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indata = None
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else:
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cmd += ["sftp"] + self.common_args + [host]
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indata = "put %s %s\n" % (pipes.quote(in_path), pipes.quote(out_path))
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p = subprocess.Popen(cmd, stdin=subprocess.PIPE,
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stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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self._send_password()
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stdout, stderr = p.communicate(indata)
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if p.returncode != 0:
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raise errors.AnsibleError("failed to transfer file to %s:\n%s\n%s" % (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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vvv("FETCH %s TO %s" % (in_path, out_path), host=self.host)
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cmd = self._password_cmd()
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host = self.host
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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 += ["scp"] + self.common_args
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cmd += [host + ":" + in_path, out_path]
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indata = None
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else:
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cmd += ["sftp"] + self.common_args + [host]
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indata = "get %s %s\n" % (in_path, out_path)
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p = subprocess.Popen(cmd, stdin=subprocess.PIPE,
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stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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self._send_password()
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stdout, stderr = p.communicate(indata)
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if p.returncode != 0:
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raise errors.AnsibleError("failed to transfer file from %s:\n%s\n%s" % (in_path, stdout, stderr))
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def close(self):
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''' not applicable since we're executing openssh binaries '''
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pass
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