128 lines
4.8 KiB
Python
128 lines
4.8 KiB
Python
# Copyright 2019, David Wilson
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# 1. Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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#
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# 3. Neither the name of the copyright holder nor the names of its contributors
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# may be used to endorse or promote products derived from this software without
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# specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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# !mitogen: minify_safe
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import logging
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import mitogen.core
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import mitogen.parent
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from mitogen.core import b
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try:
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any
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except NameError:
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from mitogen.core import any
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LOG = logging.getLogger(__name__)
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class PasswordError(mitogen.core.StreamError):
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pass
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class Stream(mitogen.parent.Stream):
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# TODO: BSD su cannot handle stdin being a socketpair, but it does let the
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# child inherit fds from the parent. So we can still pass a socketpair in
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# for hybrid_tty_create_child(), there just needs to be either a shell
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# snippet or bootstrap support for fixing things up afterwards.
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create_child = staticmethod(mitogen.parent.tty_create_child)
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child_is_immediate_subprocess = False
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#: Once connected, points to the corresponding DiagLogStream, allowing it to
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#: be disconnected at the same time this stream is being torn down.
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username = 'root'
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password = None
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su_path = 'su'
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password_prompt = b('password:')
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incorrect_prompts = (
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b('su: sorry'), # BSD
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b('su: authentication failure'), # Linux
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b('su: incorrect password'), # CentOS 6
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b('authentication is denied'), # AIX
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)
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def construct(self, username=None, password=None, su_path=None,
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password_prompt=None, incorrect_prompts=None, **kwargs):
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super(Stream, self).construct(**kwargs)
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if username is not None:
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self.username = username
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if password is not None:
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self.password = password
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if su_path is not None:
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self.su_path = su_path
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if password_prompt is not None:
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self.password_prompt = password_prompt.lower()
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if incorrect_prompts is not None:
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self.incorrect_prompts = map(str.lower, incorrect_prompts)
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def _get_name(self):
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return u'su.' + mitogen.core.to_text(self.username)
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def get_boot_command(self):
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argv = mitogen.parent.Argv(super(Stream, self).get_boot_command())
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return [self.su_path, self.username, '-c', str(argv)]
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password_incorrect_msg = 'su password is incorrect'
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password_required_msg = 'su password is required'
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def _connect_input_loop(self, it):
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password_sent = False
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for buf in it:
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LOG.debug('%r: received %r', self, buf)
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if buf.endswith(self.EC0_MARKER):
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self._ec0_received()
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return
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if any(s in buf.lower() for s in self.incorrect_prompts):
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if password_sent:
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raise PasswordError(self.password_incorrect_msg)
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elif self.password_prompt in buf.lower():
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if self.password is None:
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raise PasswordError(self.password_required_msg)
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if password_sent:
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raise PasswordError(self.password_incorrect_msg)
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LOG.debug('sending password')
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self.transmit_side.write(
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mitogen.core.to_text(self.password + '\n').encode('utf-8')
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)
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password_sent = True
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raise mitogen.core.StreamError('bootstrap failed')
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def _connect_bootstrap(self):
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it = mitogen.parent.iter_read(
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fds=[self.receive_side.fd],
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deadline=self.connect_deadline,
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)
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try:
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self._connect_input_loop(it)
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finally:
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it.close()
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