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  • Committer: Teddy Hogeborn
  • Date: 2016-03-04 22:07:35 UTC
  • mto: (237.7.594 trunk)
  • mto: This revision was merged to the branch mainline in revision 335.
  • Revision ID: teddy@recompile.se-20160304220735-4xeeqt5p4nhw5cuh
Restrict the Mandos server daemon in the systemd service file.

* mandos.service ([Service]/ProtectSystem): Set to "full".
 ([Service]/PrivateTmp, [Service]/PrivateDevices,
  [Service]/ProtectHome): Set to "yes".
 ([Service]/CapabilityBoundingSet): Set to "CAP_SETUID
                                    CAP_DAC_OVERRIDE CAP_NET_RAW".

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mandos-ctl
 
1
#!/usr/bin/python
 
2
# -*- mode: python; coding: utf-8 -*-
 
3
# 
 
4
# Mandos Monitor - Control and monitor the Mandos server
 
5
# 
 
6
# Copyright © 2008-2016 Teddy Hogeborn
 
7
# Copyright © 2008-2016 Björn Påhlsson
 
8
# 
 
9
# This program is free software: you can redistribute it and/or modify
 
10
# it under the terms of the GNU General Public License as published by
 
11
# the Free Software Foundation, either version 3 of the License, or
 
12
# (at your option) any later version.
 
13
#
 
14
#     This program is distributed in the hope that it will be useful,
 
15
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
 
16
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
17
#     GNU General Public License for more details.
 
18
# 
 
19
# You should have received a copy of the GNU General Public License
 
20
# along with this program.  If not, see
 
21
# <http://www.gnu.org/licenses/>.
 
22
# 
 
23
# Contact the authors at <mandos@recompile.se>.
 
24
# 
 
25
 
 
26
from __future__ import (division, absolute_import, print_function,
 
27
                        unicode_literals)
 
28
 
 
29
try:
 
30
    from future_builtins import *
 
31
except ImportError:
 
32
    pass
 
33
 
 
34
import sys
 
35
import argparse
 
36
import locale
 
37
import datetime
 
38
import re
 
39
import os
 
40
import collections
 
41
import doctest
 
42
 
 
43
import dbus
 
44
 
 
45
if sys.version_info.major == 2:
 
46
    str = unicode
 
47
 
 
48
locale.setlocale(locale.LC_ALL, "")
 
49
 
 
50
tablewords = {
 
51
    "Name": "Name",
 
52
    "Enabled": "Enabled",
 
53
    "Timeout": "Timeout",
 
54
    "LastCheckedOK": "Last Successful Check",
 
55
    "LastApprovalRequest": "Last Approval Request",
 
56
    "Created": "Created",
 
57
    "Interval": "Interval",
 
58
    "Host": "Host",
 
59
    "Fingerprint": "Fingerprint",
 
60
    "CheckerRunning": "Check Is Running",
 
61
    "LastEnabled": "Last Enabled",
 
62
    "ApprovalPending": "Approval Is Pending",
 
63
    "ApprovedByDefault": "Approved By Default",
 
64
    "ApprovalDelay": "Approval Delay",
 
65
    "ApprovalDuration": "Approval Duration",
 
66
    "Checker": "Checker",
 
67
    "ExtendedTimeout": "Extended Timeout"
 
68
}
 
69
defaultkeywords = ("Name", "Enabled", "Timeout", "LastCheckedOK")
 
70
domain = "se.recompile"
 
71
busname = domain + ".Mandos"
 
72
server_path = "/"
 
73
server_interface = domain + ".Mandos"
 
74
client_interface = domain + ".Mandos.Client"
 
75
version = "1.7.3"
 
76
 
 
77
 
 
78
try:
 
79
    dbus.OBJECT_MANAGER_IFACE
 
80
except AttributeError:
 
81
    dbus.OBJECT_MANAGER_IFACE = "org.freedesktop.DBus.ObjectManager"
 
82
 
 
83
def milliseconds_to_string(ms):
 
84
    td = datetime.timedelta(0, 0, 0, ms)
 
85
    return ("{days}{hours:02}:{minutes:02}:{seconds:02}".format(
 
86
        days = "{}T".format(td.days) if td.days else "",
 
87
        hours = td.seconds // 3600,
 
88
        minutes = (td.seconds % 3600) // 60,
 
89
        seconds = td.seconds % 60))
 
90
 
 
91
 
 
92
def rfc3339_duration_to_delta(duration):
 
93
    """Parse an RFC 3339 "duration" and return a datetime.timedelta
 
94
    
 
95
    >>> rfc3339_duration_to_delta("P7D")
 
96
    datetime.timedelta(7)
 
97
    >>> rfc3339_duration_to_delta("PT60S")
 
98
    datetime.timedelta(0, 60)
 
99
    >>> rfc3339_duration_to_delta("PT60M")
 
100
    datetime.timedelta(0, 3600)
 
101
    >>> rfc3339_duration_to_delta("PT24H")
 
102
    datetime.timedelta(1)
 
103
    >>> rfc3339_duration_to_delta("P1W")
 
104
    datetime.timedelta(7)
 
105
    >>> rfc3339_duration_to_delta("PT5M30S")
 
106
    datetime.timedelta(0, 330)
 
107
    >>> rfc3339_duration_to_delta("P1DT3M20S")
 
108
    datetime.timedelta(1, 200)
 
109
    """
 
110
    
 
111
    # Parsing an RFC 3339 duration with regular expressions is not
 
112
    # possible - there would have to be multiple places for the same
 
113
    # values, like seconds.  The current code, while more esoteric, is
 
114
    # cleaner without depending on a parsing library.  If Python had a
 
115
    # built-in library for parsing we would use it, but we'd like to
 
116
    # avoid excessive use of external libraries.
 
117
    
 
118
    # New type for defining tokens, syntax, and semantics all-in-one
 
119
    Token = collections.namedtuple("Token", (
 
120
        "regexp",  # To match token; if "value" is not None, must have
 
121
                   # a "group" containing digits
 
122
        "value",   # datetime.timedelta or None
 
123
        "followers"))           # Tokens valid after this token
 
124
    # RFC 3339 "duration" tokens, syntax, and semantics; taken from
 
125
    # the "duration" ABNF definition in RFC 3339, Appendix A.
 
126
    token_end = Token(re.compile(r"$"), None, frozenset())
 
127
    token_second = Token(re.compile(r"(\d+)S"),
 
128
                         datetime.timedelta(seconds=1),
 
129
                         frozenset((token_end, )))
 
130
    token_minute = Token(re.compile(r"(\d+)M"),
 
131
                         datetime.timedelta(minutes=1),
 
132
                         frozenset((token_second, token_end)))
 
133
    token_hour = Token(re.compile(r"(\d+)H"),
 
134
                       datetime.timedelta(hours=1),
 
135
                       frozenset((token_minute, token_end)))
 
136
    token_time = Token(re.compile(r"T"),
 
137
                       None,
 
138
                       frozenset((token_hour, token_minute,
 
139
                                  token_second)))
 
140
    token_day = Token(re.compile(r"(\d+)D"),
 
141
                      datetime.timedelta(days=1),
 
142
                      frozenset((token_time, token_end)))
 
143
    token_month = Token(re.compile(r"(\d+)M"),
 
144
                        datetime.timedelta(weeks=4),
 
145
                        frozenset((token_day, token_end)))
 
146
    token_year = Token(re.compile(r"(\d+)Y"),
 
147
                       datetime.timedelta(weeks=52),
 
148
                       frozenset((token_month, token_end)))
 
149
    token_week = Token(re.compile(r"(\d+)W"),
 
150
                       datetime.timedelta(weeks=1),
 
151
                       frozenset((token_end, )))
 
152
    token_duration = Token(re.compile(r"P"), None,
 
153
                           frozenset((token_year, token_month,
 
154
                                      token_day, token_time,
 
155
                                      token_week)))
 
156
    # Define starting values
 
157
    value = datetime.timedelta() # Value so far
 
158
    found_token = None
 
159
    followers = frozenset((token_duration, )) # Following valid tokens
 
160
    s = duration                # String left to parse
 
161
    # Loop until end token is found
 
162
    while found_token is not token_end:
 
163
        # Search for any currently valid tokens
 
164
        for token in followers:
 
165
            match = token.regexp.match(s)
 
166
            if match is not None:
 
167
                # Token found
 
168
                if token.value is not None:
 
169
                    # Value found, parse digits
 
170
                    factor = int(match.group(1), 10)
 
171
                    # Add to value so far
 
172
                    value += factor * token.value
 
173
                # Strip token from string
 
174
                s = token.regexp.sub("", s, 1)
 
175
                # Go to found token
 
176
                found_token = token
 
177
                # Set valid next tokens
 
178
                followers = found_token.followers
 
179
                break
 
180
        else:
 
181
            # No currently valid tokens were found
 
182
            raise ValueError("Invalid RFC 3339 duration: {!r}"
 
183
                             .format(duration))
 
184
    # End token found
 
185
    return value
 
186
 
 
187
 
 
188
def string_to_delta(interval):
 
189
    """Parse a string and return a datetime.timedelta
 
190
    
 
191
    >>> string_to_delta('7d')
 
192
    datetime.timedelta(7)
 
193
    >>> string_to_delta('60s')
 
194
    datetime.timedelta(0, 60)
 
195
    >>> string_to_delta('60m')
 
196
    datetime.timedelta(0, 3600)
 
197
    >>> string_to_delta('24h')
 
198
    datetime.timedelta(1)
 
199
    >>> string_to_delta('1w')
 
200
    datetime.timedelta(7)
 
201
    >>> string_to_delta('5m 30s')
 
202
    datetime.timedelta(0, 330)
 
203
    """
 
204
    
 
205
    try:
 
206
        return rfc3339_duration_to_delta(interval)
 
207
    except ValueError:
 
208
        pass
 
209
    
 
210
    value = datetime.timedelta(0)
 
211
    regexp = re.compile(r"(\d+)([dsmhw]?)")
 
212
    
 
213
    for num, suffix in regexp.findall(interval):
 
214
        if suffix == "d":
 
215
            value += datetime.timedelta(int(num))
 
216
        elif suffix == "s":
 
217
            value += datetime.timedelta(0, int(num))
 
218
        elif suffix == "m":
 
219
            value += datetime.timedelta(0, 0, 0, 0, int(num))
 
220
        elif suffix == "h":
 
221
            value += datetime.timedelta(0, 0, 0, 0, 0, int(num))
 
222
        elif suffix == "w":
 
223
            value += datetime.timedelta(0, 0, 0, 0, 0, 0, int(num))
 
224
        elif suffix == "":
 
225
            value += datetime.timedelta(0, 0, 0, int(num))
 
226
    return value
 
227
 
 
228
 
 
229
def print_clients(clients, keywords):
 
230
    def valuetostring(value, keyword):
 
231
        if type(value) is dbus.Boolean:
 
232
            return "Yes" if value else "No"
 
233
        if keyword in ("Timeout", "Interval", "ApprovalDelay",
 
234
                       "ApprovalDuration", "ExtendedTimeout"):
 
235
            return milliseconds_to_string(value)
 
236
        return str(value)
 
237
    
 
238
    # Create format string to print table rows
 
239
    format_string = " ".join("{{{key}:{width}}}".format(
 
240
        width = max(len(tablewords[key]),
 
241
                    max(len(valuetostring(client[key], key))
 
242
                        for client in clients)),
 
243
        key = key)
 
244
                             for key in keywords)
 
245
    # Print header line
 
246
    print(format_string.format(**tablewords))
 
247
    for client in clients:
 
248
        print(format_string.format(**{
 
249
            key: valuetostring(client[key], key)
 
250
            for key in keywords }))
 
251
 
 
252
 
 
253
def has_actions(options):
 
254
    return any((options.enable,
 
255
                options.disable,
 
256
                options.bump_timeout,
 
257
                options.start_checker,
 
258
                options.stop_checker,
 
259
                options.is_enabled,
 
260
                options.remove,
 
261
                options.checker is not None,
 
262
                options.timeout is not None,
 
263
                options.extended_timeout is not None,
 
264
                options.interval is not None,
 
265
                options.approved_by_default is not None,
 
266
                options.approval_delay is not None,
 
267
                options.approval_duration is not None,
 
268
                options.host is not None,
 
269
                options.secret is not None,
 
270
                options.approve,
 
271
                options.deny))
 
272
 
 
273
 
 
274
def main():
 
275
    parser = argparse.ArgumentParser()
 
276
    parser.add_argument("--version", action="version",
 
277
                        version = "%(prog)s {}".format(version),
 
278
                        help="show version number and exit")
 
279
    parser.add_argument("-a", "--all", action="store_true",
 
280
                        help="Select all clients")
 
281
    parser.add_argument("-v", "--verbose", action="store_true",
 
282
                        help="Print all fields")
 
283
    parser.add_argument("-e", "--enable", action="store_true",
 
284
                        help="Enable client")
 
285
    parser.add_argument("-d", "--disable", action="store_true",
 
286
                        help="disable client")
 
287
    parser.add_argument("-b", "--bump-timeout", action="store_true",
 
288
                        help="Bump timeout for client")
 
289
    parser.add_argument("--start-checker", action="store_true",
 
290
                        help="Start checker for client")
 
291
    parser.add_argument("--stop-checker", action="store_true",
 
292
                        help="Stop checker for client")
 
293
    parser.add_argument("-V", "--is-enabled", action="store_true",
 
294
                        help="Check if client is enabled")
 
295
    parser.add_argument("-r", "--remove", action="store_true",
 
296
                        help="Remove client")
 
297
    parser.add_argument("-c", "--checker",
 
298
                        help="Set checker command for client")
 
299
    parser.add_argument("-t", "--timeout",
 
300
                        help="Set timeout for client")
 
301
    parser.add_argument("--extended-timeout",
 
302
                        help="Set extended timeout for client")
 
303
    parser.add_argument("-i", "--interval",
 
304
                        help="Set checker interval for client")
 
305
    parser.add_argument("--approve-by-default", action="store_true",
 
306
                        default=None, dest="approved_by_default",
 
307
                        help="Set client to be approved by default")
 
308
    parser.add_argument("--deny-by-default", action="store_false",
 
309
                        dest="approved_by_default",
 
310
                        help="Set client to be denied by default")
 
311
    parser.add_argument("--approval-delay",
 
312
                        help="Set delay before client approve/deny")
 
313
    parser.add_argument("--approval-duration",
 
314
                        help="Set duration of one client approval")
 
315
    parser.add_argument("-H", "--host", help="Set host for client")
 
316
    parser.add_argument("-s", "--secret",
 
317
                        type=argparse.FileType(mode="rb"),
 
318
                        help="Set password blob (file) for client")
 
319
    parser.add_argument("-A", "--approve", action="store_true",
 
320
                        help="Approve any current client request")
 
321
    parser.add_argument("-D", "--deny", action="store_true",
 
322
                        help="Deny any current client request")
 
323
    parser.add_argument("--check", action="store_true",
 
324
                        help="Run self-test")
 
325
    parser.add_argument("client", nargs="*", help="Client name")
 
326
    options = parser.parse_args()
 
327
    
 
328
    if has_actions(options) and not (options.client or options.all):
 
329
        parser.error("Options require clients names or --all.")
 
330
    if options.verbose and has_actions(options):
 
331
        parser.error("--verbose can only be used alone or with"
 
332
                     " --all.")
 
333
    if options.all and not has_actions(options):
 
334
        parser.error("--all requires an action.")
 
335
 
 
336
    if options.check:
 
337
        fail_count, test_count = doctest.testmod()
 
338
        sys.exit(os.EX_OK if fail_count == 0 else 1)
 
339
    
 
340
    try:
 
341
        bus = dbus.SystemBus()
 
342
        mandos_dbus_objc = bus.get_object(busname, server_path)
 
343
    except dbus.exceptions.DBusException:
 
344
        print("Could not connect to Mandos server", file=sys.stderr)
 
345
        sys.exit(1)
 
346
    
 
347
    mandos_serv = dbus.Interface(mandos_dbus_objc,
 
348
                                 dbus_interface = server_interface)
 
349
    mandos_serv_object_manager = dbus.Interface(
 
350
        mandos_dbus_objc, dbus_interface = dbus.OBJECT_MANAGER_IFACE)
 
351
    
 
352
    #block stderr since dbus library prints to stderr
 
353
    null = os.open(os.path.devnull, os.O_RDWR)
 
354
    stderrcopy = os.dup(sys.stderr.fileno())
 
355
    os.dup2(null, sys.stderr.fileno())
 
356
    os.close(null)
 
357
    try:
 
358
        try:
 
359
            mandos_clients = { path: ifs_and_props[client_interface]
 
360
                               for path, ifs_and_props in
 
361
                               mandos_serv_object_manager
 
362
                               .GetManagedObjects().items()
 
363
                               if client_interface in ifs_and_props }
 
364
        finally:
 
365
            #restore stderr
 
366
            os.dup2(stderrcopy, sys.stderr.fileno())
 
367
            os.close(stderrcopy)
 
368
    except dbus.exceptions.DBusException as e:
 
369
        print("Access denied: Accessing mandos server through D-Bus: {}"
 
370
              .format(e), file=sys.stderr)
 
371
        sys.exit(1)
 
372
    
 
373
    # Compile dict of (clients: properties) to process
 
374
    clients={}
 
375
    
 
376
    if options.all or not options.client:
 
377
        clients = { bus.get_object(busname, path): properties
 
378
                    for path, properties in mandos_clients.items() }
 
379
    else:
 
380
        for name in options.client:
 
381
            for path, client in mandos_clients.items():
 
382
                if client["Name"] == name:
 
383
                    client_objc = bus.get_object(busname, path)
 
384
                    clients[client_objc] = client
 
385
                    break
 
386
            else:
 
387
                print("Client not found on server: {!r}"
 
388
                      .format(name), file=sys.stderr)
 
389
                sys.exit(1)
 
390
    
 
391
    if not has_actions(options) and clients:
 
392
        if options.verbose:
 
393
            keywords = ("Name", "Enabled", "Timeout", "LastCheckedOK",
 
394
                        "Created", "Interval", "Host", "Fingerprint",
 
395
                        "CheckerRunning", "LastEnabled",
 
396
                        "ApprovalPending", "ApprovedByDefault",
 
397
                        "LastApprovalRequest", "ApprovalDelay",
 
398
                        "ApprovalDuration", "Checker",
 
399
                        "ExtendedTimeout")
 
400
        else:
 
401
            keywords = defaultkeywords
 
402
        
 
403
        print_clients(clients.values(), keywords)
 
404
    else:
 
405
        # Process each client in the list by all selected options
 
406
        for client in clients:
 
407
            
 
408
            def set_client_prop(prop, value):
 
409
                """Set a Client D-Bus property"""
 
410
                client.Set(client_interface, prop, value,
 
411
                           dbus_interface=dbus.PROPERTIES_IFACE)
 
412
            
 
413
            def set_client_prop_ms(prop, value):
 
414
                """Set a Client D-Bus property, converted
 
415
                from a string to milliseconds."""
 
416
                set_client_prop(prop,
 
417
                                string_to_delta(value).total_seconds()
 
418
                                * 1000)
 
419
            
 
420
            if options.remove:
 
421
                mandos_serv.RemoveClient(client.__dbus_object_path__)
 
422
            if options.enable:
 
423
                set_client_prop("Enabled", dbus.Boolean(True))
 
424
            if options.disable:
 
425
                set_client_prop("Enabled", dbus.Boolean(False))
 
426
            if options.bump_timeout:
 
427
                set_client_prop("LastCheckedOK", "")
 
428
            if options.start_checker:
 
429
                set_client_prop("CheckerRunning", dbus.Boolean(True))
 
430
            if options.stop_checker:
 
431
                set_client_prop("CheckerRunning", dbus.Boolean(False))
 
432
            if options.is_enabled:
 
433
                sys.exit(0 if client.Get(client_interface,
 
434
                                         "Enabled",
 
435
                                         dbus_interface=
 
436
                                         dbus.PROPERTIES_IFACE)
 
437
                         else 1)
 
438
            if options.checker is not None:
 
439
                set_client_prop("Checker", options.checker)
 
440
            if options.host is not None:
 
441
                set_client_prop("Host", options.host)
 
442
            if options.interval is not None:
 
443
                set_client_prop_ms("Interval", options.interval)
 
444
            if options.approval_delay is not None:
 
445
                set_client_prop_ms("ApprovalDelay",
 
446
                                   options.approval_delay)
 
447
            if options.approval_duration is not None:
 
448
                set_client_prop_ms("ApprovalDuration",
 
449
                                   options.approval_duration)
 
450
            if options.timeout is not None:
 
451
                set_client_prop_ms("Timeout", options.timeout)
 
452
            if options.extended_timeout is not None:
 
453
                set_client_prop_ms("ExtendedTimeout",
 
454
                                   options.extended_timeout)
 
455
            if options.secret is not None:
 
456
                set_client_prop("Secret",
 
457
                                dbus.ByteArray(options.secret.read()))
 
458
            if options.approved_by_default is not None:
 
459
                set_client_prop("ApprovedByDefault",
 
460
                                dbus.Boolean(options
 
461
                                             .approved_by_default))
 
462
            if options.approve:
 
463
                client.Approve(dbus.Boolean(True),
 
464
                               dbus_interface=client_interface)
 
465
            elif options.deny:
 
466
                client.Approve(dbus.Boolean(False),
 
467
                               dbus_interface=client_interface)
 
468
 
 
469
 
 
470
if __name__ == "__main__":
 
471
    main()