161 lines
5.5 KiB
Python
161 lines
5.5 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 re
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import mitogen.core
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import mitogen.parent
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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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password_incorrect_msg = 'su password is incorrect'
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password_required_msg = 'su password is required'
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class PasswordError(mitogen.core.StreamError):
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pass
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class SetupBootstrapProtocol(mitogen.parent.BootstrapProtocol):
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password_sent = False
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def setup_patterns(self, conn):
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"""
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su options cause the regexes used to vary. This is a mess, requires
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reworking.
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"""
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incorrect_pattern = re.compile(
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mitogen.core.b('|').join(
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re.escape(s.encode('utf-8'))
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for s in conn.options.incorrect_prompts
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),
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re.I
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)
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prompt_pattern = re.compile(
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re.escape(
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conn.options.password_prompt.encode('utf-8')
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),
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re.I
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)
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self.PATTERNS = mitogen.parent.BootstrapProtocol.PATTERNS + [
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(incorrect_pattern, type(self)._on_password_incorrect),
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]
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self.PARTIAL_PATTERNS = mitogen.parent.BootstrapProtocol.PARTIAL_PATTERNS + [
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(prompt_pattern, type(self)._on_password_prompt),
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]
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def _on_password_prompt(self, line, match):
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LOG.debug('%r: (password prompt): %r',
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self.stream.name, line.decode('utf-8', 'replace'))
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if self.stream.conn.options.password is None:
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self.stream.conn._fail_connection(
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PasswordError(password_required_msg)
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)
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return
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if self.password_sent:
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self.stream.conn._fail_connection(
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PasswordError(password_incorrect_msg)
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)
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return
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self.stream.transmit_side.write(
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(self.stream.conn.options.password + '\n').encode('utf-8')
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)
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self.password_sent = True
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def _on_password_incorrect(self, line, match):
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self.stream.conn._fail_connection(
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PasswordError(password_incorrect_msg)
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)
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class Options(mitogen.parent.Options):
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username = u'root'
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password = None
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su_path = 'su'
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password_prompt = u'password:'
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incorrect_prompts = (
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u'su: sorry', # BSD
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u'su: authentication failure', # Linux
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u'su: incorrect password', # CentOS 6
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u'authentication is denied', # AIX
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)
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def __init__(self, username=None, password=None, su_path=None,
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password_prompt=None, incorrect_prompts=None, **kwargs):
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super(Options, self).__init__(**kwargs)
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if username is not None:
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self.username = mitogen.core.to_text(username)
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if password is not None:
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self.password = mitogen.core.to_text(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
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if incorrect_prompts is not None:
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self.incorrect_prompts = [
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mitogen.core.to_text(p)
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for p in incorrect_prompts
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]
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class Connection(mitogen.parent.Connection):
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options_class = Options
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stream_protocol_class = SetupBootstrapProtocol
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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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def _get_name(self):
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return u'su.' + self.options.username
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def stream_factory(self):
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stream = super(Connection, self).stream_factory()
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stream.protocol.setup_patterns(self)
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return stream
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def get_boot_command(self):
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argv = mitogen.parent.Argv(super(Connection, self).get_boot_command())
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return [self.options.su_path, self.options.username, '-c', str(argv)]
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