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mitogen/mitogen/su.py

123 lines
4.7 KiB
Python

# Copyright 2017, David Wilson
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# 3. Neither the name of the copyright holder nor the names of its contributors
# may be used to endorse or promote products derived from this software without
# specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
import logging
import os
import mitogen.core
import mitogen.parent
from mitogen.core import b
LOG = logging.getLogger(__name__)
class PasswordError(mitogen.core.StreamError):
pass
class Stream(mitogen.parent.Stream):
# TODO: BSD su cannot handle stdin being a socketpair, but it does let the
# child inherit fds from the parent. So we can still pass a socketpair in
# for hybrid_tty_create_child(), there just needs to be either a shell
# snippet or bootstrap support for fixing things up afterwards.
create_child = staticmethod(mitogen.parent.tty_create_child)
child_is_immediate_subprocess = False
#: Once connected, points to the corresponding DiagLogStream, allowing it to
#: be disconnected at the same time this stream is being torn down.
username = 'root'
password = None
su_path = 'su'
password_prompt = b('password:')
incorrect_prompts = (
b('su: sorry'), # BSD
b('su: authentication failure'), # Linux
b('su: incorrect password'), # CentOS 6
)
def construct(self, username=None, password=None, su_path=None,
password_prompt=None, incorrect_prompts=None, **kwargs):
super(Stream, self).construct(**kwargs)
if username is not None:
self.username = username
if password is not None:
self.password = password
if su_path is not None:
self.su_path = su_path
if password_prompt is not None:
self.password_prompt = password_prompt.lower()
if incorrect_prompts is not None:
self.incorrect_prompts = map(str.lower, incorrect_prompts)
def connect(self):
super(Stream, self).connect()
self.name = u'su.' + mitogen.core.to_text(self.username)
def get_boot_command(self):
argv = mitogen.parent.Argv(super(Stream, self).get_boot_command())
return [self.su_path, self.username, '-c', str(argv)]
password_incorrect_msg = 'su password is incorrect'
password_required_msg = 'su password is required'
def _connect_input_loop(self, it):
password_sent = False
for buf in it:
LOG.debug('%r: received %r', self, buf)
if buf.endswith(self.EC0_MARKER):
self._ec0_received()
return
if any(s in buf.lower() for s in self.incorrect_prompts):
if password_sent:
raise PasswordError(self.password_incorrect_msg)
elif self.password_prompt in buf.lower():
if self.password is None:
raise PasswordError(self.password_required_msg)
if password_sent:
raise PasswordError(self.password_incorrect_msg)
LOG.debug('sending password')
self.transmit_side.write(
mitogen.core.to_text(self.password + '\n').encode('utf-8')
)
password_sent = True
raise mitogen.core.StreamError('bootstrap failed')
def _connect_bootstrap(self):
it = mitogen.parent.iter_read(
fds=[self.receive_side.fd],
deadline=self.connect_deadline,
)
try:
self._connect_input_loop(it)
finally:
it.close()