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# Copyright 2019, 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.
# !mitogen: minify_safe
import logging
import re
import mitogen.core
import mitogen.parent
LOG = logging.getLogger(__name__)
password_incorrect_msg = 'su password is incorrect'
password_required_msg = 'su password is required'
class PasswordError(mitogen.core.StreamError):
pass
class SetupBootstrapProtocol(mitogen.parent.BootstrapProtocol):
password_sent = False
def setup_patterns(self, conn):
"""
su options cause the regexes used to vary. This is a mess, requires
reworking.
"""
incorrect_pattern = re.compile(
mitogen.core.b('|').join(
re.escape(s.encode('utf-8'))
for s in conn.options.incorrect_prompts
),
re.I
)
prompt_pattern = re.compile(
re.escape(
conn.options.password_prompt.encode('utf-8')
),
re.I
)
self.PATTERNS = mitogen.parent.BootstrapProtocol.PATTERNS + [
(incorrect_pattern, type(self)._on_password_incorrect),
]
self.PARTIAL_PATTERNS = mitogen.parent.BootstrapProtocol.PARTIAL_PATTERNS + [
(prompt_pattern, type(self)._on_password_prompt),
]
def _on_password_prompt(self, line, match):
LOG.debug('%r: (password prompt): %r',
self.stream.name, line.decode('utf-8', 'replace'))
if self.stream.conn.options.password is None:
self.stream.conn._fail_connection(
PasswordError(password_required_msg)
)
return
if self.password_sent:
self.stream.conn._fail_connection(
PasswordError(password_incorrect_msg)
)
return
self.stream.transmit_side.write(
(self.stream.conn.options.password + '\n').encode('utf-8')
)
self.password_sent = True
def _on_password_incorrect(self, line, match):
self.stream.conn._fail_connection(
PasswordError(password_incorrect_msg)
)
class Options(mitogen.parent.Options):
username = u'root'
password = None
su_path = 'su'
password_prompt = u'password:'
incorrect_prompts = (
u'su: sorry', # BSD
u'su: authentication failure', # Linux
u'su: incorrect password', # CentOS 6
u'authentication is denied', # AIX
)
def __init__(self, username=None, password=None, su_path=None,
password_prompt=None, incorrect_prompts=None, **kwargs):
super(Options, self).__init__(**kwargs)
if username is not None:
self.username = mitogen.core.to_text(username)
if password is not None:
self.password = mitogen.core.to_text(password)
if su_path is not None:
self.su_path = su_path
if password_prompt is not None:
self.password_prompt = password_prompt
if incorrect_prompts is not None:
self.incorrect_prompts = [
mitogen.core.to_text(p)
for p in incorrect_prompts
]
class Connection(mitogen.parent.Connection):
options_class = Options
stream_protocol_class = SetupBootstrapProtocol
# 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
def _get_name(self):
return u'su.' + self.options.username
def stream_factory(self):
stream = super(Connection, self).stream_factory()
stream.protocol.setup_patterns(self)
return stream
def get_boot_command(self):
argv = mitogen.parent.Argv(super(Connection, self).get_boot_command())
return [self.options.su_path, self.options.username, '-c', str(argv)]
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