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mitogen/mitogen/sudo.py

295 lines
12 KiB
Python

# 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 base64
import logging
import optparse
import re
import mitogen.core
import mitogen.parent
LOG = logging.getLogger(__name__)
password_incorrect_msg = 'sudo password is incorrect'
password_required_msg = 'sudo password is required'
# These are base64-encoded UTF-8 as our existing minifier/module server
# struggles with Unicode Python source in some (forgotten) circumstances.
PASSWORD_PROMPTS = [
'cGFzc3dvcmQ=', # english
'bG96aW5rYQ==', # sr@latin.po
'44OR44K544Ov44O844OJ', # ja.po
'4Kaq4Ka+4Ka44KaT4Kef4Ka+4Kaw4KeN4Kah', # bn.po
'2YPZhNmF2Kkg2KfZhNiz2LE=', # ar.po
'cGFzYWhpdHph', # eu.po
'0L/QsNGA0L7Qu9GM', # uk.po
'cGFyb29s', # et.po
'c2FsYXNhbmE=', # fi.po
'4Kiq4Ki+4Ki44Ki14Kiw4Kih', # pa.po
'Y29udHJhc2lnbm8=', # ia.po
'Zm9jYWwgZmFpcmU=', # ga.po
'16HXodee15Q=', # he.po
'4Kqq4Kq+4Kq44Kq14Kqw4KuN4Kqh', # gu.po
'0L/QsNGA0L7Qu9Cw', # bg.po
'4Kyq4K2N4Kyw4Kys4K2H4Ky2IOCsuOCsmeCtjeCsleCth+CspA==', # or.po
'4K6V4K6f4K614K+B4K6a4K+N4K6a4K+K4K6y4K+N', # ta.po
'cGFzc3dvcnQ=', # de.po
'7JWU7Zi4', # ko.po
'0LvQvtC30LjQvdC60LA=', # sr.po
'beG6rXQga2jhuql1', # vi.po
'c2VuaGE=', # pt_BR.po
'cGFzc3dvcmQ=', # it.po
'aGVzbG8=', # cs.po
'5a+G56K877ya', # zh_TW.po
'aGVzbG8=', # sk.po
'4LC44LCC4LCV4LGH4LCk4LCq4LCm4LCu4LGB', # te.po
'0L/QsNGA0L7Qu9GM', # kk.po
'aGFzxYJv', # pl.po
'Y29udHJhc2VueWE=', # ca.po
'Y29udHJhc2XDsWE=', # es.po
'4LSF4LSf4LSv4LS+4LSz4LS14LS+4LSV4LWN4LSV4LWN', # ml.po
'c2VuaGE=', # pt.po
'5a+G56CB77ya', # zh_CN.po
'4KSX4KWB4KSq4KWN4KSk4KS24KSs4KWN4KSm', # mr.po
'bMO2c2Vub3Jk', # sv.po
'4YOe4YOQ4YOg4YOd4YOa4YOY', # ka.po
'4KS24KSs4KWN4KSm4KSV4KWC4KSf', # hi.po
'YWRnYW5nc2tvZGU=', # da.po
'4La74LeE4LeD4LeK4La04Lav4La6', # si.po
'cGFzc29yZA==', # nb.po
'd2FjaHR3b29yZA==', # nl.po
'4Kaq4Ka+4Ka44KaT4Kef4Ka+4Kaw4KeN4Kah', # bn_IN.po
'cGFyb2xh', # tr.po
'4LKX4LOB4LKq4LON4LKk4LKq4LKm', # kn.po
'c2FuZGk=', # id.po
'0L/QsNGA0L7Qu9GM', # ru.po
'amVsc3rDsw==', # hu.po
'bW90IGRlIHBhc3Nl', # fr.po
'aXBoYXNpd2VkaQ==', # zu.po
'4Z6W4Z624Z6A4Z+S4Z6Z4Z6f4Z6Y4Z+S4Z6E4Z624Z6P4Z+LwqDhn5Y=', # km.po
'4KaX4KeB4Kaq4KeN4Kak4Ka24Kas4KeN4Kam', # as.po
]
PASSWORD_PROMPT_RE = re.compile(
mitogen.core.b('|').join(
base64.b64decode(s)
for s in PASSWORD_PROMPTS
),
re.I
)
SUDO_OPTIONS = [
#(False, 'bool', '--askpass', '-A')
#(False, 'str', '--auth-type', '-a')
#(False, 'bool', '--background', '-b')
#(False, 'str', '--close-from', '-C')
#(False, 'str', '--login-class', 'c')
(True, 'bool', '--preserve-env', '-E'),
#(False, 'bool', '--edit', '-e')
#(False, 'str', '--group', '-g')
(True, 'bool', '--set-home', '-H'),
#(False, 'str', '--host', '-h')
(False, 'bool', '--login', '-i'),
#(False, 'bool', '--remove-timestamp', '-K')
#(False, 'bool', '--reset-timestamp', '-k')
#(False, 'bool', '--list', '-l')
#(False, 'bool', '--preserve-groups', '-P')
#(False, 'str', '--prompt', '-p')
# SELinux options. Passed through as-is.
(False, 'str', '--role', '-r'),
(False, 'str', '--type', '-t'),
# These options are supplied by default by Ansible, but are ignored, as
# sudo always runs under a TTY with Mitogen.
(True, 'bool', '--stdin', '-S'),
(True, 'bool', '--non-interactive', '-n'),
#(False, 'str', '--shell', '-s')
#(False, 'str', '--other-user', '-U')
(False, 'str', '--user', '-u'),
#(False, 'bool', '--version', '-V')
#(False, 'bool', '--validate', '-v')
]
class OptionParser(optparse.OptionParser):
def help(self):
self.exit()
def error(self, msg):
self.exit(msg=msg)
def exit(self, status=0, msg=None):
msg = 'sudo: ' + (msg or 'unsupported option')
raise mitogen.core.StreamError(msg)
def make_sudo_parser():
parser = OptionParser()
for supported, kind, longopt, shortopt in SUDO_OPTIONS:
if kind == 'bool':
parser.add_option(longopt, shortopt, action='store_true')
else:
parser.add_option(longopt, shortopt)
return parser
def parse_sudo_flags(args):
parser = make_sudo_parser()
opts, args = parser.parse_args(args)
if len(args):
raise mitogen.core.StreamError('unsupported sudo arguments:'+str(args))
return opts
class PasswordError(mitogen.core.StreamError):
pass
def option(default, *args):
for arg in args:
if arg is not None:
return arg
return default
class Options(mitogen.parent.Options):
sudo_path = 'sudo'
username = 'root'
password = None
preserve_env = False
set_home = False
login = False
selinux_role = None
selinux_type = None
def __init__(self, username=None, sudo_path=None, password=None,
preserve_env=None, set_home=None, sudo_args=None,
login=None, selinux_role=None, selinux_type=None, **kwargs):
super(Options, self).__init__(**kwargs)
opts = parse_sudo_flags(sudo_args or [])
self.username = option(self.username, username, opts.user)
self.sudo_path = option(self.sudo_path, sudo_path)
if password:
self.password = mitogen.core.to_text(password)
self.preserve_env = option(self.preserve_env,
preserve_env, opts.preserve_env)
self.set_home = option(self.set_home, set_home, opts.set_home)
self.login = option(self.login, login, opts.login)
self.selinux_role = option(self.selinux_role, selinux_role, opts.role)
self.selinux_type = option(self.selinux_type, selinux_type, opts.type)
class SetupProtocol(mitogen.parent.RegexProtocol):
password_sent = False
def _on_password_prompt(self, line, match):
LOG.debug('%s: (password prompt): %s',
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
PARTIAL_PATTERNS = [
(PASSWORD_PROMPT_RE, _on_password_prompt),
]
class Connection(mitogen.parent.Connection):
diag_protocol_class = SetupProtocol
options_class = Options
create_child = staticmethod(mitogen.parent.hybrid_tty_create_child)
create_child_args = {
'escalates_privilege': True,
}
child_is_immediate_subprocess = False
def _get_name(self):
return u'sudo.' + mitogen.core.to_text(self.options.username)
def get_boot_command(self):
# Note: sudo did not introduce long-format option processing until July
# 2013, so even though we parse long-format options, supply short-form
# to the sudo command.
boot_cmd = super(Connection, self).get_boot_command()
bits = [self.options.sudo_path, '-u', self.options.username]
if self.options.preserve_env:
bits += ['-E']
if self.options.set_home:
bits += ['-H']
if self.options.login:
bits += ['-i']
if self.options.selinux_role:
bits += ['-r', self.options.selinux_role]
if self.options.selinux_type:
bits += ['-t', self.options.selinux_type]
# special handling for bash builtins
# TODO: more efficient way of doing this, at least
# it's only 1 iteration of boot_cmd to go through
source_found = False
for cmd in boot_cmd[:]:
# rip `source` from boot_cmd if it exists; sudo.py can't run this
# even with -i or -s options
# since we've already got our ssh command working we shouldn't
# need to source anymore
# couldn't figure out how to get this to work using sudo flags
if 'source' == cmd:
boot_cmd.remove(cmd)
source_found = True
continue
if source_found:
# remove words until we hit the python interpreter call
if not cmd.endswith('python'):
boot_cmd.remove(cmd)
else:
break
return bits + ['--'] + boot_cmd