/mandos/trunk

#!/usr/bin/python

# -*- mode: python; coding: utf-8 -*-

# 

# Mandos Monitor - Control and monitor the Mandos server

# 

# Copyright © 2008-2012 Teddy Hogeborn

# Copyright © 2008-2012 Björn Påhlsson

# 

# This program is free software: you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

#

#     This program is distributed in the hope that it will be useful,

#     but WITHOUT ANY WARRANTY; without even the implied warranty of

#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

#     GNU General Public License for more details.

# 

# You should have received a copy of the GNU General Public License

# along with this program.  If not, see

# <http://www.gnu.org/licenses/>.

# 

# Contact the authors at <mandos@recompile.se>.

# 

from __future__ import (division, absolute_import, print_function,

                        unicode_literals)

from future_builtins import *

import sys

import argparse

import locale

import datetime

import re

import os

import collections

import doctest

import dbus

locale.setlocale(locale.LC_ALL, "")

tablewords = {

    "Name": "Name",

    "Enabled": "Enabled",

    "Timeout": "Timeout",

    "LastCheckedOK": "Last Successful Check",

    "LastApprovalRequest": "Last Approval Request",

    "Created": "Created",

    "Interval": "Interval",

    "Host": "Host",

    "Fingerprint": "Fingerprint",

    "CheckerRunning": "Check Is Running",

    "LastEnabled": "Last Enabled",

    "ApprovalPending": "Approval Is Pending",

    "ApprovedByDefault": "Approved By Default",

    "ApprovalDelay": "Approval Delay",

    "ApprovalDuration": "Approval Duration",

    "Checker": "Checker",

    "ExtendedTimeout" : "Extended Timeout"

    }

defaultkeywords = ("Name", "Enabled", "Timeout", "LastCheckedOK")

domain = "se.recompile"

busname = domain + ".Mandos"

server_path = "/"

server_interface = domain + ".Mandos"

client_interface = domain + ".Mandos.Client"

version = "1.6.1"

def timedelta_to_milliseconds(td):

    """Convert a datetime.timedelta object to milliseconds"""

    return ((td.days * 24 * 60 * 60 * 1000)

            + (td.seconds * 1000)

            + (td.microseconds // 1000))

def milliseconds_to_string(ms):

    td = datetime.timedelta(0, 0, 0, ms)

    return ("{days}{hours:02}:{minutes:02}:{seconds:02}"

            .format(days = "{0}T".format(td.days) if td.days else "",

                    hours = td.seconds // 3600,

                    minutes = (td.seconds % 3600) // 60,

                    seconds = td.seconds % 60,

                    ))

def rfc3339_duration_to_delta(duration):

    """Parse an RFC 3339 "duration" and return a datetime.timedelta

    >>> rfc3339_duration_to_delta("P7D")

    datetime.timedelta(7)

    >>> rfc3339_duration_to_delta("PT60S")

    datetime.timedelta(0, 60)

    >>> rfc3339_duration_to_delta("PT60M")

    datetime.timedelta(0, 3600)

    >>> rfc3339_duration_to_delta("PT24H")

    datetime.timedelta(1)

    >>> rfc3339_duration_to_delta("P1W")

    datetime.timedelta(7)

    >>> rfc3339_duration_to_delta("PT5M30S")

    datetime.timedelta(0, 330)

    >>> rfc3339_duration_to_delta("P1DT3M20S")

    datetime.timedelta(1, 200)

    """

    # Parsing an RFC 3339 duration with regular expressions is not

    # possible - there would have to be multiple places for the same

    # values, like seconds.  The current code, while more esoteric, is

    # cleaner without depending on a parsing library.  If Python had a

    # built-in library for parsing we would use it, but we'd like to

    # avoid excessive use of external libraries.

    # New type for defining tokens, syntax, and semantics all-in-one

    Token = collections.namedtuple("Token",

                                   ("regexp", # To match token; if

                                              # "value" is not None,

                                              # must have a "group"

                                              # containing digits

                                    "value",  # datetime.timedelta or

                                              # None

                                    "followers")) # Tokens valid after

                                                  # this token

    # RFC 3339 "duration" tokens, syntax, and semantics; taken from

    # the "duration" ABNF definition in RFC 3339, Appendix A.

    token_end = Token(re.compile(r"$"), None, frozenset())

    token_second = Token(re.compile(r"(\d+)S"),

                         datetime.timedelta(seconds=1),

                         frozenset((token_end,)))

    token_minute = Token(re.compile(r"(\d+)M"),

                         datetime.timedelta(minutes=1),

                         frozenset((token_second, token_end)))

    token_hour = Token(re.compile(r"(\d+)H"),

                       datetime.timedelta(hours=1),

                       frozenset((token_minute, token_end)))

    token_time = Token(re.compile(r"T"),

                       None,

                       frozenset((token_hour, token_minute,

                                  token_second)))

    token_day = Token(re.compile(r"(\d+)D"),

                      datetime.timedelta(days=1),

                      frozenset((token_time, token_end)))

    token_month = Token(re.compile(r"(\d+)M"),

                        datetime.timedelta(weeks=4),

                        frozenset((token_day, token_end)))

    token_year = Token(re.compile(r"(\d+)Y"),

                       datetime.timedelta(weeks=52),

                       frozenset((token_month, token_end)))

    token_week = Token(re.compile(r"(\d+)W"),

                       datetime.timedelta(weeks=1),

                       frozenset((token_end,)))

    token_duration = Token(re.compile(r"P"), None,

                           frozenset((token_year, token_month,

                                      token_day, token_time,

                                      token_week))),

    # Define starting values

    value = datetime.timedelta() # Value so far

    found_token = None

    followers = frozenset(token_duration,) # Following valid tokens

    s = duration                # String left to parse

    # Loop until end token is found

    while found_token is not token_end:

        # Search for any currently valid tokens

        for token in followers:

            match = token.regexp.match(s)

            if match is not None:

                # Token found

                if token.value is not None:

                    # Value found, parse digits

                    factor = int(match.group(1), 10)

                    # Add to value so far

                    value += factor * token.value

                # Strip token from string

                s = token.regexp.sub("", s, 1)

                # Go to found token

                found_token = token

                # Set valid next tokens

                followers = found_token.followers

                break

        else:

            # No currently valid tokens were found

            raise ValueError("Invalid RFC 3339 duration")

    # End token found

    return value

def string_to_delta(interval):

    """Parse a string and return a datetime.timedelta

    >>> string_to_delta("7d")

    datetime.timedelta(7)

    >>> string_to_delta("60s")

    datetime.timedelta(0, 60)

    >>> string_to_delta("60m")

    datetime.timedelta(0, 3600)

    >>> string_to_delta("24h")

    datetime.timedelta(1)

    >>> string_to_delta("1w")

    datetime.timedelta(7)

    >>> string_to_delta("5m 30s")

    datetime.timedelta(0, 330)

    """

    try:

        return rfc3339_duration_to_delta(interval)

    except ValueError:

        pass

    value = datetime.timedelta(0)

    regexp = re.compile(r"(\d+)([dsmhw]?)")

    for num, suffix in regexp.findall(interval):

        if suffix == "d":

            value += datetime.timedelta(int(num))

        elif suffix == "s":

            value += datetime.timedelta(0, int(num))

        elif suffix == "m":

            value += datetime.timedelta(0, 0, 0, 0, int(num))

        elif suffix == "h":

            value += datetime.timedelta(0, 0, 0, 0, 0, int(num))

        elif suffix == "w":

            value += datetime.timedelta(0, 0, 0, 0, 0, 0, int(num))

        elif suffix == "":

            value += datetime.timedelta(0, 0, 0, int(num))

    return value

def print_clients(clients, keywords):

    def valuetostring(value, keyword):

        if type(value) is dbus.Boolean:

            return "Yes" if value else "No"

        if keyword in ("Timeout", "Interval", "ApprovalDelay",

                       "ApprovalDuration", "ExtendedTimeout"):

            return milliseconds_to_string(value)

        return unicode(value)

    # Create format string to print table rows

    format_string = " ".join("{{{key}:{width}}}".format(

            width = max(len(tablewords[key]),

                        max(len(valuetostring(client[key],

                                              key))

                            for client in

                            clients)),

            key = key) for key in keywords)

    # Print header line

    print(format_string.format(**tablewords))

    for client in clients:

        print(format_string.format(**dict((key,

                                           valuetostring(client[key],

                                                         key))

                                          for key in keywords)))

def has_actions(options):

    return any((options.enable,

                options.disable,

                options.bump_timeout,

                options.start_checker,

                options.stop_checker,

                options.is_enabled,

                options.remove,

                options.checker is not None,

                options.timeout is not None,

                options.extended_timeout is not None,

                options.interval is not None,

                options.approved_by_default is not None,

                options.approval_delay is not None,

                options.approval_duration is not None,

                options.host is not None,

                options.secret is not None,

                options.approve,

                options.deny))

def main():

    parser = argparse.ArgumentParser()

    parser.add_argument("--version", action="version",

                        version = "%(prog)s {0}".format(version),

                        help="show version number and exit")

    parser.add_argument("-a", "--all", action="store_true",

                        help="Select all clients")

    parser.add_argument("-v", "--verbose", action="store_true",

                        help="Print all fields")

    parser.add_argument("-e", "--enable", action="store_true",

                        help="Enable client")

    parser.add_argument("-d", "--disable", action="store_true",

                        help="disable client")

    parser.add_argument("-b", "--bump-timeout", action="store_true",

                        help="Bump timeout for client")

    parser.add_argument("--start-checker", action="store_true",

                        help="Start checker for client")

    parser.add_argument("--stop-checker", action="store_true",

                        help="Stop checker for client")

    parser.add_argument("-V", "--is-enabled", action="store_true",

                        help="Check if client is enabled")

    parser.add_argument("-r", "--remove", action="store_true",

                        help="Remove client")

    parser.add_argument("-c", "--checker",

                        help="Set checker command for client")

    parser.add_argument("-t", "--timeout",

                        help="Set timeout for client")

    parser.add_argument("--extended-timeout",

                        help="Set extended timeout for client")

    parser.add_argument("-i", "--interval",

                        help="Set checker interval for client")

    parser.add_argument("--approve-by-default", action="store_true",

                        default=None, dest="approved_by_default",

                        help="Set client to be approved by default")

    parser.add_argument("--deny-by-default", action="store_false",

                        dest="approved_by_default",

                        help="Set client to be denied by default")

    parser.add_argument("--approval-delay",

                        help="Set delay before client approve/deny")

    parser.add_argument("--approval-duration",

                        help="Set duration of one client approval")

    parser.add_argument("-H", "--host", help="Set host for client")

    parser.add_argument("-s", "--secret", type=file,

                        help="Set password blob (file) for client")

    parser.add_argument("-A", "--approve", action="store_true",

                        help="Approve any current client request")

    parser.add_argument("-D", "--deny", action="store_true",

                        help="Deny any current client request")

    parser.add_argument("--check", action="store_true",

                        help="Run self-test")

    parser.add_argument("client", nargs="*", help="Client name")

    options = parser.parse_args()

    if has_actions(options) and not (options.client or options.all):

        parser.error("Options require clients names or --all.")

    if options.verbose and has_actions(options):

        parser.error("--verbose can only be used alone or with"

                     " --all.")

    if options.all and not has_actions(options):

        parser.error("--all requires an action.")

    if options.check:

        fail_count, test_count = doctest.testmod()

        sys.exit(0 if fail_count == 0 else 1)

    try:

        bus = dbus.SystemBus()

        mandos_dbus_objc = bus.get_object(busname, server_path)

    except dbus.exceptions.DBusException:

        print("Could not connect to Mandos server",

              file=sys.stderr)

        sys.exit(1)

    mandos_serv = dbus.Interface(mandos_dbus_objc,

                                 dbus_interface = server_interface)

    #block stderr since dbus library prints to stderr

    null = os.open(os.path.devnull, os.O_RDWR)

    stderrcopy = os.dup(sys.stderr.fileno())

    os.dup2(null, sys.stderr.fileno())

    os.close(null)

    try:

        try:

            mandos_clients = mandos_serv.GetAllClientsWithProperties()

        finally:

            #restore stderr

            os.dup2(stderrcopy, sys.stderr.fileno())

            os.close(stderrcopy)

    except dbus.exceptions.DBusException:

        print("Access denied: Accessing mandos server through dbus.",

              file=sys.stderr)

        sys.exit(1)

    # Compile dict of (clients: properties) to process

    clients={}

    if options.all or not options.client:

        clients = dict((bus.get_object(busname, path), properties)

                       for path, properties in

                       mandos_clients.iteritems())

    else:

        for name in options.client:

            for path, client in mandos_clients.iteritems():

                if client["Name"] == name:

                    client_objc = bus.get_object(busname, path)

                    clients[client_objc] = client

                    break

            else:

                print("Client not found on server: {0!r}"

                      .format(name), file=sys.stderr)

                sys.exit(1)

    if not has_actions(options) and clients:

        if options.verbose:

            keywords = ("Name", "Enabled", "Timeout",

                        "LastCheckedOK", "Created", "Interval",

                        "Host", "Fingerprint", "CheckerRunning",

                        "LastEnabled", "ApprovalPending",

                        "ApprovedByDefault",

                        "LastApprovalRequest", "ApprovalDelay",

                        "ApprovalDuration", "Checker",

                        "ExtendedTimeout")

        else:

            keywords = defaultkeywords

        print_clients(clients.values(), keywords)

    else:

        # Process each client in the list by all selected options

        for client in clients:

            def set_client_prop(prop, value):

                """Set a Client D-Bus property"""

                client.Set(client_interface, prop, value,

                           dbus_interface=dbus.PROPERTIES_IFACE)

            def set_client_prop_ms(prop, value):

                """Set a Client D-Bus property, converted

                from a string to milliseconds."""

                set_client_prop(prop,

                                timedelta_to_milliseconds

                                (string_to_delta(value)))

            if options.remove:

                mandos_serv.RemoveClient(client.__dbus_object_path__)

            if options.enable:

                set_client_prop("Enabled", dbus.Boolean(True))

            if options.disable:

                set_client_prop("Enabled", dbus.Boolean(False))

            if options.bump_timeout:

                set_client_prop("LastCheckedOK", "")

            if options.start_checker:

                set_client_prop("CheckerRunning", dbus.Boolean(True))

            if options.stop_checker:

                set_client_prop("CheckerRunning", dbus.Boolean(False))

            if options.is_enabled:

                sys.exit(0 if client.Get(client_interface,

                                         "Enabled",

                                         dbus_interface=

                                         dbus.PROPERTIES_IFACE)

                         else 1)

            if options.checker is not None:

                set_client_prop("Checker", options.checker)

            if options.host is not None:

                set_client_prop("Host", options.host)

            if options.interval is not None:

                set_client_prop_ms("Interval", options.interval)

            if options.approval_delay is not None:

                set_client_prop_ms("ApprovalDelay",

                                   options.approval_delay)

            if options.approval_duration is not None:

                set_client_prop_ms("ApprovalDuration",

                                   options.approval_duration)

            if options.timeout is not None:

                set_client_prop_ms("Timeout", options.timeout)

            if options.extended_timeout is not None:

                set_client_prop_ms("ExtendedTimeout",

                                   options.extended_timeout)

            if options.secret is not None:

                set_client_prop("Secret",

                                dbus.ByteArray(options.secret.read()))

            if options.approved_by_default is not None:

                set_client_prop("ApprovedByDefault",

                                dbus.Boolean(options

                                             .approved_by_default))

            if options.approve:

                client.Approve(dbus.Boolean(True),

                               dbus_interface=client_interface)

            elif options.deny:

                client.Approve(dbus.Boolean(False),

                               dbus_interface=client_interface)

if __name__ == "__main__":

    main()