/mandos/trunk

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  • Committer: Teddy Hogeborn
  • Date: 2019-07-27 10:11:45 UTC
  • Revision ID: teddy@recompile.se-20190727101145-jnpbpf8220gldbcd
Add dracut(8) support

Add support for the dracut(8) system for generating initramfs image
files; dracut is an alternative to the "initramfs-tools" package.

* .bzrignore (dracut-module/password-agent): Ignore new binary file.
* dracut-module: New directory for the dracut module.
* INSTALL (Prerequisites/Libraries/Mandos Client): Add dracut as an
                                                   alternative to
                                                   initramfs-tools,
                                                   and also add GLib.
* Makefile (DRACUTMODULE, GLIB_CFLAGS, GLIB_LIBS): New.
  (CPROGS): Add "dracut-module/password-agent".
  (DOCS): Add "dracut-module/password-agent.8mandos".
  (dracut-module/password-agent.8mandos): New.
  (dracut-module/password-agent.8mandos.xhtml): - '' -
  (dracut-module/password-agent): - '' -
  (check): Add command to run tests of password-agent(8mandos).
  (install-client-nokey): Also install the dracut module directory,
                          its files, and the password-agent(8mandos)
                          manual page.
  (install-client): To update the initramfs image file, run
                    update-initramfs or dracut depending on what is
                    installed.
  (uninstall-client): - '' - and also uninstall the the files in the
                      dracut module directory, that directory itself,
                      and the password-agent(8mandos) manual page.
* debian/control (Build-Depends): Add "libglib2.0-dev (>=2.40)".
  (Package: mandos-client/Depends): Add "dracut (>= 044+241-3)" as an
                                    alternative dependency to
                                    initramfs-tools.
  (Package: mandos-client/Conflicts): New; set to
                                      "dracut-config-generic".
  (debian/mandos-client.README.Debian): Document alternative commands
                                        to update the initramfs image
                                        for when dracut is used.
* debian/mandos-client.postinst (update_initramfs): Use alternative
                                                    commands to update
                                                    the initramfs
                                                    image for when
                                                    dracut is used.
* debian/tests/control (password-agent, password-agent-suid): Add two
                                                              new tests.
* dracut-module/ask-password-mandos.path: New.
* dracut-module/ask-password-mandos.service: - '' -
* dracut-module/cmdline-mandos.sh: - '' -
* dracut-module/module-setup.sh: - '' -
* dracut-module/password-agent.c: - '' -
* dracut-module/password-agent.xml: - '' -
* initramfs-unpack: Use the dracut "skipcpio" command, if available.
                    Also be more flexible and try hard to detect where
                    compressed data starts.
* plugins.d/mandos-client.xml (SECURITY): Be more precise that the
                                          mandos-client binary might
                                          not always be setuid, but
                                          that the program assumes
                                          that it has been started
                                          that way.
* plugins.d/password-prompt.c: Add new "--prompt" option.
  (conflict_detection): First try to detect the new PID file of
                        plymouth.
  (main): Define and use new "prompt" variable.
* plugins.d/password-prompt.xml (SYNOPSIS): Show new --prompt option.
  (DESCRIPTION): Describe new behavior of looking for plymouth PID
                 file.
  (OPTIONS): Document new "--prompt" option.
  (ENVIRONMENT): Clarify that the CRYPTTAB_SOURCE and CRYPTTAB_NAME
                 environment variables are not used if the --prompt
                 option is used.  Remove unnecessarily specific
                 details about where the CRYPTTAB_SOURCE and
                 CRYPTTAB_NAME comes from, since this can now be
                 either initramfs-tools or dracut.
  (SEE ALSO): Remove superfluous crypttab(5) reference, and add commas
              to separate the other references.
* plugins.d/plymouth.c: Add new "--prompt" and "--debug" options.
  (debug): New global flag.
  (fprintf_plus): New function, used for debug output.
  (exec_and_wait): Add extra "const" to "argv" argument.
  (main): Define and use new "prompt" variable.  Add debug output.
  (main/options, main/parse_opt): New; used to parse options.
* plugins.d/plymouth.xml (SYNOPSIS): Show new options.
  (OPTIONS): Document new options.
  (ENVIRONMENT): Clarify that the cryptsource and crypttarget
                 environment variables are not used if the --prompt
                 option is used.  Remove unnecessarily specific
                 details about where the cryptsource and crypttarget
                 comes from, since this can now be either
                 initramfs-tools or dracut.
  (EXAMPLE): Add an example using an option.
  (SEE ALSO): Remove superfluous crypttab(5) reference.
* plugins.d/splashy.xml (ENVIRONMENT): Clarify that the cryptsource
                                       and crypttarget environment
                                       variables are not used if the
                                       --prompt option is used.
                                       Remove unnecessarily specific
                                       details about where the
                                       cryptsource and crypttarget
                                       comes from, since this can now
                                       be either initramfs-tools or
                                       dracut.
  (SEE ALSO): Remove superfluous crypttab(5) reference.
* plugins.d/usplash.xml (ENVIRONMENT): Clarify that the cryptsource
                                       and crypttarget environment
                                       variables are not used if the
                                       --prompt option is used.
                                       Remove unnecessarily specific
                                       details about where the
                                       cryptsource and crypttarget
                                       comes from, since this can now
                                       be either initramfs-tools or
                                       dracut.
  (SEE ALSO): Remove superfluous crypttab(5) reference.

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Lines of Context:
mandos
1
1
#!/usr/bin/python
2
2
# -*- mode: python; coding: utf-8 -*-
3
 
# 
 
3
#
4
4
# Mandos server - give out binary blobs to connecting clients.
5
 
# 
 
5
#
6
6
# This program is partly derived from an example program for an Avahi
7
7
# service publisher, downloaded from
8
8
# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
9
 
# methods "add" and "remove" in the "AvahiService" class, the
10
 
# "server_state_changed" and "entry_group_state_changed" functions,
11
 
# and some lines in "main".
12
 
# 
 
9
# methods "add", "remove", "server_state_changed",
 
10
# "entry_group_state_changed", "cleanup", and "activate" in the
 
11
# "AvahiService" class, and some lines in "main".
 
12
#
13
13
# Everything else is
14
 
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
15
 
# 
16
 
# This program is free software: you can redistribute it and/or modify
17
 
# it under the terms of the GNU General Public License as published by
 
14
# Copyright © 2008-2019 Teddy Hogeborn
 
15
# Copyright © 2008-2019 Björn Påhlsson
 
16
#
 
17
# This file is part of Mandos.
 
18
#
 
19
# Mandos is free software: you can redistribute it and/or modify it
 
20
# under the terms of the GNU General Public License as published by
18
21
# the Free Software Foundation, either version 3 of the License, or
19
22
# (at your option) any later version.
20
23
#
21
 
#     This program is distributed in the hope that it will be useful,
22
 
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
 
24
#     Mandos is distributed in the hope that it will be useful, but
 
25
#     WITHOUT ANY WARRANTY; without even the implied warranty of
23
26
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
24
27
#     GNU General Public License for more details.
25
 
# 
 
28
#
26
29
# You should have received a copy of the GNU General Public License
27
 
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
28
 
# 
29
 
# Contact the authors at <mandos@fukt.bsnet.se>.
30
 
# 
31
 
 
32
 
from __future__ import division
33
 
 
34
 
import SocketServer
 
30
# along with Mandos.  If not, see <http://www.gnu.org/licenses/>.
 
31
#
 
32
# Contact the authors at <mandos@recompile.se>.
 
33
#
 
34
 
 
35
from __future__ import (division, absolute_import, print_function,
 
36
                        unicode_literals)
 
37
 
 
38
try:
 
39
    from future_builtins import *
 
40
except ImportError:
 
41
    pass
 
42
 
 
43
try:
 
44
    import SocketServer as socketserver
 
45
except ImportError:
 
46
    import socketserver
35
47
import socket
36
 
import select
37
 
from optparse import OptionParser
 
48
import argparse
38
49
import datetime
39
50
import errno
40
 
import gnutls.crypto
41
 
import gnutls.connection
42
 
import gnutls.errors
43
 
import gnutls.library.functions
44
 
import gnutls.library.constants
45
 
import gnutls.library.types
46
 
import ConfigParser
 
51
try:
 
52
    import ConfigParser as configparser
 
53
except ImportError:
 
54
    import configparser
47
55
import sys
48
56
import re
49
57
import os
50
58
import signal
51
 
from sets import Set
52
59
import subprocess
53
60
import atexit
54
61
import stat
55
62
import logging
56
63
import logging.handlers
 
64
import pwd
 
65
import contextlib
 
66
import struct
 
67
import fcntl
 
68
import functools
 
69
try:
 
70
    import cPickle as pickle
 
71
except ImportError:
 
72
    import pickle
 
73
import multiprocessing
 
74
import types
 
75
import binascii
 
76
import tempfile
 
77
import itertools
 
78
import collections
 
79
import codecs
57
80
 
58
81
import dbus
59
 
import gobject
60
 
import avahi
 
82
import dbus.service
 
83
from gi.repository import GLib
61
84
from dbus.mainloop.glib import DBusGMainLoop
62
85
import ctypes
63
 
 
64
 
version = "1.0"
65
 
 
66
 
logger = logging.Logger('mandos')
67
 
syslogger = logging.handlers.SysLogHandler\
68
 
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
69
 
             address = "/dev/log")
70
 
syslogger.setFormatter(logging.Formatter\
71
 
                        ('Mandos: %(levelname)s: %(message)s'))
72
 
logger.addHandler(syslogger)
 
86
import ctypes.util
 
87
import xml.dom.minidom
 
88
import inspect
 
89
 
 
90
# Try to find the value of SO_BINDTODEVICE:
 
91
try:
 
92
    # This is where SO_BINDTODEVICE is in Python 3.3 (or 3.4?) and
 
93
    # newer, and it is also the most natural place for it:
 
94
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
 
95
except AttributeError:
 
96
    try:
 
97
        # This is where SO_BINDTODEVICE was up to and including Python
 
98
        # 2.6, and also 3.2:
 
99
        from IN import SO_BINDTODEVICE
 
100
    except ImportError:
 
101
        # In Python 2.7 it seems to have been removed entirely.
 
102
        # Try running the C preprocessor:
 
103
        try:
 
104
            cc = subprocess.Popen(["cc", "--language=c", "-E",
 
105
                                   "/dev/stdin"],
 
106
                                  stdin=subprocess.PIPE,
 
107
                                  stdout=subprocess.PIPE)
 
108
            stdout = cc.communicate(
 
109
                "#include <sys/socket.h>\nSO_BINDTODEVICE\n")[0]
 
110
            SO_BINDTODEVICE = int(stdout.splitlines()[-1])
 
111
        except (OSError, ValueError, IndexError):
 
112
            # No value found
 
113
            SO_BINDTODEVICE = None
 
114
 
 
115
if sys.version_info.major == 2:
 
116
    str = unicode
 
117
 
 
118
version = "1.8.4"
 
119
stored_state_file = "clients.pickle"
 
120
 
 
121
logger = logging.getLogger()
 
122
syslogger = None
 
123
 
 
124
try:
 
125
    if_nametoindex = ctypes.cdll.LoadLibrary(
 
126
        ctypes.util.find_library("c")).if_nametoindex
 
127
except (OSError, AttributeError):
 
128
 
 
129
    def if_nametoindex(interface):
 
130
        "Get an interface index the hard way, i.e. using fcntl()"
 
131
        SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
 
132
        with contextlib.closing(socket.socket()) as s:
 
133
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
134
                                struct.pack(b"16s16x", interface))
 
135
        interface_index = struct.unpack("I", ifreq[16:20])[0]
 
136
        return interface_index
 
137
 
 
138
 
 
139
def copy_function(func):
 
140
    """Make a copy of a function"""
 
141
    if sys.version_info.major == 2:
 
142
        return types.FunctionType(func.func_code,
 
143
                                  func.func_globals,
 
144
                                  func.func_name,
 
145
                                  func.func_defaults,
 
146
                                  func.func_closure)
 
147
    else:
 
148
        return types.FunctionType(func.__code__,
 
149
                                  func.__globals__,
 
150
                                  func.__name__,
 
151
                                  func.__defaults__,
 
152
                                  func.__closure__)
 
153
 
 
154
 
 
155
def initlogger(debug, level=logging.WARNING):
 
156
    """init logger and add loglevel"""
 
157
 
 
158
    global syslogger
 
159
    syslogger = (logging.handlers.SysLogHandler(
 
160
        facility=logging.handlers.SysLogHandler.LOG_DAEMON,
 
161
        address="/dev/log"))
 
162
    syslogger.setFormatter(logging.Formatter
 
163
                           ('Mandos [%(process)d]: %(levelname)s:'
 
164
                            ' %(message)s'))
 
165
    logger.addHandler(syslogger)
 
166
 
 
167
    if debug:
 
168
        console = logging.StreamHandler()
 
169
        console.setFormatter(logging.Formatter('%(asctime)s %(name)s'
 
170
                                               ' [%(process)d]:'
 
171
                                               ' %(levelname)s:'
 
172
                                               ' %(message)s'))
 
173
        logger.addHandler(console)
 
174
    logger.setLevel(level)
 
175
 
 
176
 
 
177
class PGPError(Exception):
 
178
    """Exception if encryption/decryption fails"""
 
179
    pass
 
180
 
 
181
 
 
182
class PGPEngine(object):
 
183
    """A simple class for OpenPGP symmetric encryption & decryption"""
 
184
 
 
185
    def __init__(self):
 
186
        self.tempdir = tempfile.mkdtemp(prefix="mandos-")
 
187
        self.gpg = "gpg"
 
188
        try:
 
189
            output = subprocess.check_output(["gpgconf"])
 
190
            for line in output.splitlines():
 
191
                name, text, path = line.split(b":")
 
192
                if name == "gpg":
 
193
                    self.gpg = path
 
194
                    break
 
195
        except OSError as e:
 
196
            if e.errno != errno.ENOENT:
 
197
                raise
 
198
        self.gnupgargs = ['--batch',
 
199
                          '--homedir', self.tempdir,
 
200
                          '--force-mdc',
 
201
                          '--quiet']
 
202
        # Only GPG version 1 has the --no-use-agent option.
 
203
        if self.gpg == "gpg" or self.gpg.endswith("/gpg"):
 
204
            self.gnupgargs.append("--no-use-agent")
 
205
 
 
206
    def __enter__(self):
 
207
        return self
 
208
 
 
209
    def __exit__(self, exc_type, exc_value, traceback):
 
210
        self._cleanup()
 
211
        return False
 
212
 
 
213
    def __del__(self):
 
214
        self._cleanup()
 
215
 
 
216
    def _cleanup(self):
 
217
        if self.tempdir is not None:
 
218
            # Delete contents of tempdir
 
219
            for root, dirs, files in os.walk(self.tempdir,
 
220
                                             topdown=False):
 
221
                for filename in files:
 
222
                    os.remove(os.path.join(root, filename))
 
223
                for dirname in dirs:
 
224
                    os.rmdir(os.path.join(root, dirname))
 
225
            # Remove tempdir
 
226
            os.rmdir(self.tempdir)
 
227
            self.tempdir = None
 
228
 
 
229
    def password_encode(self, password):
 
230
        # Passphrase can not be empty and can not contain newlines or
 
231
        # NUL bytes.  So we prefix it and hex encode it.
 
232
        encoded = b"mandos" + binascii.hexlify(password)
 
233
        if len(encoded) > 2048:
 
234
            # GnuPG can't handle long passwords, so encode differently
 
235
            encoded = (b"mandos" + password.replace(b"\\", b"\\\\")
 
236
                       .replace(b"\n", b"\\n")
 
237
                       .replace(b"\0", b"\\x00"))
 
238
        return encoded
 
239
 
 
240
    def encrypt(self, data, password):
 
241
        passphrase = self.password_encode(password)
 
242
        with tempfile.NamedTemporaryFile(
 
243
                dir=self.tempdir) as passfile:
 
244
            passfile.write(passphrase)
 
245
            passfile.flush()
 
246
            proc = subprocess.Popen([self.gpg, '--symmetric',
 
247
                                     '--passphrase-file',
 
248
                                     passfile.name]
 
249
                                    + self.gnupgargs,
 
250
                                    stdin=subprocess.PIPE,
 
251
                                    stdout=subprocess.PIPE,
 
252
                                    stderr=subprocess.PIPE)
 
253
            ciphertext, err = proc.communicate(input=data)
 
254
        if proc.returncode != 0:
 
255
            raise PGPError(err)
 
256
        return ciphertext
 
257
 
 
258
    def decrypt(self, data, password):
 
259
        passphrase = self.password_encode(password)
 
260
        with tempfile.NamedTemporaryFile(
 
261
                dir=self.tempdir) as passfile:
 
262
            passfile.write(passphrase)
 
263
            passfile.flush()
 
264
            proc = subprocess.Popen([self.gpg, '--decrypt',
 
265
                                     '--passphrase-file',
 
266
                                     passfile.name]
 
267
                                    + self.gnupgargs,
 
268
                                    stdin=subprocess.PIPE,
 
269
                                    stdout=subprocess.PIPE,
 
270
                                    stderr=subprocess.PIPE)
 
271
            decrypted_plaintext, err = proc.communicate(input=data)
 
272
        if proc.returncode != 0:
 
273
            raise PGPError(err)
 
274
        return decrypted_plaintext
 
275
 
 
276
 
 
277
# Pretend that we have an Avahi module
 
278
class avahi(object):
 
279
    """This isn't so much a class as it is a module-like namespace."""
 
280
    IF_UNSPEC = -1               # avahi-common/address.h
 
281
    PROTO_UNSPEC = -1            # avahi-common/address.h
 
282
    PROTO_INET = 0               # avahi-common/address.h
 
283
    PROTO_INET6 = 1              # avahi-common/address.h
 
284
    DBUS_NAME = "org.freedesktop.Avahi"
 
285
    DBUS_INTERFACE_ENTRY_GROUP = DBUS_NAME + ".EntryGroup"
 
286
    DBUS_INTERFACE_SERVER = DBUS_NAME + ".Server"
 
287
    DBUS_PATH_SERVER = "/"
 
288
 
 
289
    @staticmethod
 
290
    def string_array_to_txt_array(t):
 
291
        return dbus.Array((dbus.ByteArray(s.encode("utf-8"))
 
292
                           for s in t), signature="ay")
 
293
    ENTRY_GROUP_ESTABLISHED = 2  # avahi-common/defs.h
 
294
    ENTRY_GROUP_COLLISION = 3    # avahi-common/defs.h
 
295
    ENTRY_GROUP_FAILURE = 4      # avahi-common/defs.h
 
296
    SERVER_INVALID = 0           # avahi-common/defs.h
 
297
    SERVER_REGISTERING = 1       # avahi-common/defs.h
 
298
    SERVER_RUNNING = 2           # avahi-common/defs.h
 
299
    SERVER_COLLISION = 3         # avahi-common/defs.h
 
300
    SERVER_FAILURE = 4           # avahi-common/defs.h
73
301
 
74
302
 
75
303
class AvahiError(Exception):
76
 
    def __init__(self, value):
 
304
    def __init__(self, value, *args, **kwargs):
77
305
        self.value = value
78
 
    def __str__(self):
79
 
        return repr(self.value)
 
306
        return super(AvahiError, self).__init__(value, *args,
 
307
                                                **kwargs)
 
308
 
80
309
 
81
310
class AvahiServiceError(AvahiError):
82
311
    pass
83
312
 
 
313
 
84
314
class AvahiGroupError(AvahiError):
85
315
    pass
86
316
 
87
317
 
88
318
class AvahiService(object):
89
319
    """An Avahi (Zeroconf) service.
 
320
 
90
321
    Attributes:
91
322
    interface: integer; avahi.IF_UNSPEC or an interface index.
92
323
               Used to optionally bind to the specified interface.
93
324
    name: string; Example: 'Mandos'
94
325
    type: string; Example: '_mandos._tcp'.
95
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
 
326
     See <https://www.iana.org/assignments/service-names-port-numbers>
96
327
    port: integer; what port to announce
97
328
    TXT: list of strings; TXT record for the service
98
329
    domain: string; Domain to publish on, default to .local if empty.
100
331
    max_renames: integer; maximum number of renames
101
332
    rename_count: integer; counter so we only rename after collisions
102
333
                  a sensible number of times
 
334
    group: D-Bus Entry Group
 
335
    server: D-Bus Server
 
336
    bus: dbus.SystemBus()
103
337
    """
104
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
105
 
                 type = None, port = None, TXT = None, domain = "",
106
 
                 host = "", max_renames = 32768):
 
338
 
 
339
    def __init__(self,
 
340
                 interface=avahi.IF_UNSPEC,
 
341
                 name=None,
 
342
                 servicetype=None,
 
343
                 port=None,
 
344
                 TXT=None,
 
345
                 domain="",
 
346
                 host="",
 
347
                 max_renames=32768,
 
348
                 protocol=avahi.PROTO_UNSPEC,
 
349
                 bus=None):
107
350
        self.interface = interface
108
351
        self.name = name
109
 
        self.type = type
 
352
        self.type = servicetype
110
353
        self.port = port
111
 
        if TXT is None:
112
 
            self.TXT = []
113
 
        else:
114
 
            self.TXT = TXT
 
354
        self.TXT = TXT if TXT is not None else []
115
355
        self.domain = domain
116
356
        self.host = host
117
357
        self.rename_count = 0
118
 
    def rename(self):
 
358
        self.max_renames = max_renames
 
359
        self.protocol = protocol
 
360
        self.group = None       # our entry group
 
361
        self.server = None
 
362
        self.bus = bus
 
363
        self.entry_group_state_changed_match = None
 
364
 
 
365
    def rename(self, remove=True):
119
366
        """Derived from the Avahi example code"""
120
367
        if self.rename_count >= self.max_renames:
121
 
            logger.critical(u"No suitable service name found after %i"
122
 
                            u" retries, exiting.", rename_count)
 
368
            logger.critical("No suitable Zeroconf service name found"
 
369
                            " after %i retries, exiting.",
 
370
                            self.rename_count)
123
371
            raise AvahiServiceError("Too many renames")
124
 
        name = server.GetAlternativeServiceName(name)
125
 
        logger.error(u"Changing name to %r ...", name)
126
 
        syslogger.setFormatter(logging.Formatter\
127
 
                               ('Mandos (%s): %%(levelname)s:'
128
 
                               ' %%(message)s' % name))
129
 
        self.remove()
130
 
        self.add()
 
372
        self.name = str(
 
373
            self.server.GetAlternativeServiceName(self.name))
131
374
        self.rename_count += 1
 
375
        logger.info("Changing Zeroconf service name to %r ...",
 
376
                    self.name)
 
377
        if remove:
 
378
            self.remove()
 
379
        try:
 
380
            self.add()
 
381
        except dbus.exceptions.DBusException as error:
 
382
            if (error.get_dbus_name()
 
383
                == "org.freedesktop.Avahi.CollisionError"):
 
384
                logger.info("Local Zeroconf service name collision.")
 
385
                return self.rename(remove=False)
 
386
            else:
 
387
                logger.critical("D-Bus Exception", exc_info=error)
 
388
                self.cleanup()
 
389
                os._exit(1)
 
390
 
132
391
    def remove(self):
133
392
        """Derived from the Avahi example code"""
134
 
        if group is not None:
135
 
            group.Reset()
 
393
        if self.entry_group_state_changed_match is not None:
 
394
            self.entry_group_state_changed_match.remove()
 
395
            self.entry_group_state_changed_match = None
 
396
        if self.group is not None:
 
397
            self.group.Reset()
 
398
 
136
399
    def add(self):
137
400
        """Derived from the Avahi example code"""
138
 
        global group
139
 
        if group is None:
140
 
            group = dbus.Interface\
141
 
                    (bus.get_object(avahi.DBUS_NAME,
142
 
                                    server.EntryGroupNew()),
143
 
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
144
 
            group.connect_to_signal('StateChanged',
145
 
                                    entry_group_state_changed)
146
 
        logger.debug(u"Adding service '%s' of type '%s' ...",
147
 
                     service.name, service.type)
148
 
        group.AddService(
149
 
                self.interface,         # interface
150
 
                avahi.PROTO_INET6,      # protocol
151
 
                dbus.UInt32(0),         # flags
152
 
                self.name, self.type,
153
 
                self.domain, self.host,
154
 
                dbus.UInt16(self.port),
155
 
                avahi.string_array_to_txt_array(self.TXT))
156
 
        group.Commit()
157
 
 
158
 
# From the Avahi example code:
159
 
group = None                            # our entry group
160
 
# End of Avahi example code
 
401
        self.remove()
 
402
        if self.group is None:
 
403
            self.group = dbus.Interface(
 
404
                self.bus.get_object(avahi.DBUS_NAME,
 
405
                                    self.server.EntryGroupNew()),
 
406
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
407
        self.entry_group_state_changed_match = (
 
408
            self.group.connect_to_signal(
 
409
                'StateChanged', self.entry_group_state_changed))
 
410
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
 
411
                     self.name, self.type)
 
412
        self.group.AddService(
 
413
            self.interface,
 
414
            self.protocol,
 
415
            dbus.UInt32(0),     # flags
 
416
            self.name, self.type,
 
417
            self.domain, self.host,
 
418
            dbus.UInt16(self.port),
 
419
            avahi.string_array_to_txt_array(self.TXT))
 
420
        self.group.Commit()
 
421
 
 
422
    def entry_group_state_changed(self, state, error):
 
423
        """Derived from the Avahi example code"""
 
424
        logger.debug("Avahi entry group state change: %i", state)
 
425
 
 
426
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
427
            logger.debug("Zeroconf service established.")
 
428
        elif state == avahi.ENTRY_GROUP_COLLISION:
 
429
            logger.info("Zeroconf service name collision.")
 
430
            self.rename()
 
431
        elif state == avahi.ENTRY_GROUP_FAILURE:
 
432
            logger.critical("Avahi: Error in group state changed %s",
 
433
                            str(error))
 
434
            raise AvahiGroupError("State changed: {!s}".format(error))
 
435
 
 
436
    def cleanup(self):
 
437
        """Derived from the Avahi example code"""
 
438
        if self.group is not None:
 
439
            try:
 
440
                self.group.Free()
 
441
            except (dbus.exceptions.UnknownMethodException,
 
442
                    dbus.exceptions.DBusException):
 
443
                pass
 
444
            self.group = None
 
445
        self.remove()
 
446
 
 
447
    def server_state_changed(self, state, error=None):
 
448
        """Derived from the Avahi example code"""
 
449
        logger.debug("Avahi server state change: %i", state)
 
450
        bad_states = {
 
451
            avahi.SERVER_INVALID: "Zeroconf server invalid",
 
452
            avahi.SERVER_REGISTERING: None,
 
453
            avahi.SERVER_COLLISION: "Zeroconf server name collision",
 
454
            avahi.SERVER_FAILURE: "Zeroconf server failure",
 
455
        }
 
456
        if state in bad_states:
 
457
            if bad_states[state] is not None:
 
458
                if error is None:
 
459
                    logger.error(bad_states[state])
 
460
                else:
 
461
                    logger.error(bad_states[state] + ": %r", error)
 
462
            self.cleanup()
 
463
        elif state == avahi.SERVER_RUNNING:
 
464
            try:
 
465
                self.add()
 
466
            except dbus.exceptions.DBusException as error:
 
467
                if (error.get_dbus_name()
 
468
                    == "org.freedesktop.Avahi.CollisionError"):
 
469
                    logger.info("Local Zeroconf service name"
 
470
                                " collision.")
 
471
                    return self.rename(remove=False)
 
472
                else:
 
473
                    logger.critical("D-Bus Exception", exc_info=error)
 
474
                    self.cleanup()
 
475
                    os._exit(1)
 
476
        else:
 
477
            if error is None:
 
478
                logger.debug("Unknown state: %r", state)
 
479
            else:
 
480
                logger.debug("Unknown state: %r: %r", state, error)
 
481
 
 
482
    def activate(self):
 
483
        """Derived from the Avahi example code"""
 
484
        if self.server is None:
 
485
            self.server = dbus.Interface(
 
486
                self.bus.get_object(avahi.DBUS_NAME,
 
487
                                    avahi.DBUS_PATH_SERVER,
 
488
                                    follow_name_owner_changes=True),
 
489
                avahi.DBUS_INTERFACE_SERVER)
 
490
        self.server.connect_to_signal("StateChanged",
 
491
                                      self.server_state_changed)
 
492
        self.server_state_changed(self.server.GetState())
 
493
 
 
494
 
 
495
class AvahiServiceToSyslog(AvahiService):
 
496
    def rename(self, *args, **kwargs):
 
497
        """Add the new name to the syslog messages"""
 
498
        ret = super(AvahiServiceToSyslog, self).rename(*args, **kwargs)
 
499
        syslogger.setFormatter(logging.Formatter(
 
500
            'Mandos ({}) [%(process)d]: %(levelname)s: %(message)s'
 
501
            .format(self.name)))
 
502
        return ret
 
503
 
 
504
 
 
505
# Pretend that we have a GnuTLS module
 
506
class gnutls(object):
 
507
    """This isn't so much a class as it is a module-like namespace."""
 
508
 
 
509
    library = ctypes.util.find_library("gnutls")
 
510
    if library is None:
 
511
        library = ctypes.util.find_library("gnutls-deb0")
 
512
    _library = ctypes.cdll.LoadLibrary(library)
 
513
    del library
 
514
 
 
515
    # Unless otherwise indicated, the constants and types below are
 
516
    # all from the gnutls/gnutls.h C header file.
 
517
 
 
518
    # Constants
 
519
    E_SUCCESS = 0
 
520
    E_INTERRUPTED = -52
 
521
    E_AGAIN = -28
 
522
    CRT_OPENPGP = 2
 
523
    CRT_RAWPK = 3
 
524
    CLIENT = 2
 
525
    SHUT_RDWR = 0
 
526
    CRD_CERTIFICATE = 1
 
527
    E_NO_CERTIFICATE_FOUND = -49
 
528
    X509_FMT_DER = 0
 
529
    NO_TICKETS = 1<<10
 
530
    ENABLE_RAWPK = 1<<18
 
531
    CTYPE_PEERS = 3
 
532
    KEYID_USE_SHA256 = 1        # gnutls/x509.h
 
533
    OPENPGP_FMT_RAW = 0         # gnutls/openpgp.h
 
534
 
 
535
    # Types
 
536
    class session_int(ctypes.Structure):
 
537
        _fields_ = []
 
538
    session_t = ctypes.POINTER(session_int)
 
539
 
 
540
    class certificate_credentials_st(ctypes.Structure):
 
541
        _fields_ = []
 
542
    certificate_credentials_t = ctypes.POINTER(
 
543
        certificate_credentials_st)
 
544
    certificate_type_t = ctypes.c_int
 
545
 
 
546
    class datum_t(ctypes.Structure):
 
547
        _fields_ = [('data', ctypes.POINTER(ctypes.c_ubyte)),
 
548
                    ('size', ctypes.c_uint)]
 
549
 
 
550
    class openpgp_crt_int(ctypes.Structure):
 
551
        _fields_ = []
 
552
    openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)
 
553
    openpgp_crt_fmt_t = ctypes.c_int  # gnutls/openpgp.h
 
554
    log_func = ctypes.CFUNCTYPE(None, ctypes.c_int, ctypes.c_char_p)
 
555
    credentials_type_t = ctypes.c_int
 
556
    transport_ptr_t = ctypes.c_void_p
 
557
    close_request_t = ctypes.c_int
 
558
 
 
559
    # Exceptions
 
560
    class Error(Exception):
 
561
        def __init__(self, message=None, code=None, args=()):
 
562
            # Default usage is by a message string, but if a return
 
563
            # code is passed, convert it to a string with
 
564
            # gnutls.strerror()
 
565
            self.code = code
 
566
            if message is None and code is not None:
 
567
                message = gnutls.strerror(code)
 
568
            return super(gnutls.Error, self).__init__(
 
569
                message, *args)
 
570
 
 
571
    class CertificateSecurityError(Error):
 
572
        pass
 
573
 
 
574
    # Classes
 
575
    class Credentials(object):
 
576
        def __init__(self):
 
577
            self._c_object = gnutls.certificate_credentials_t()
 
578
            gnutls.certificate_allocate_credentials(
 
579
                ctypes.byref(self._c_object))
 
580
            self.type = gnutls.CRD_CERTIFICATE
 
581
 
 
582
        def __del__(self):
 
583
            gnutls.certificate_free_credentials(self._c_object)
 
584
 
 
585
    class ClientSession(object):
 
586
        def __init__(self, socket, credentials=None):
 
587
            self._c_object = gnutls.session_t()
 
588
            gnutls_flags = gnutls.CLIENT
 
589
            if gnutls.check_version("3.5.6"):
 
590
                gnutls_flags |= gnutls.NO_TICKETS
 
591
            if gnutls.has_rawpk:
 
592
                gnutls_flags |= gnutls.ENABLE_RAWPK
 
593
            gnutls.init(ctypes.byref(self._c_object), gnutls_flags)
 
594
            del gnutls_flags
 
595
            gnutls.set_default_priority(self._c_object)
 
596
            gnutls.transport_set_ptr(self._c_object, socket.fileno())
 
597
            gnutls.handshake_set_private_extensions(self._c_object,
 
598
                                                    True)
 
599
            self.socket = socket
 
600
            if credentials is None:
 
601
                credentials = gnutls.Credentials()
 
602
            gnutls.credentials_set(self._c_object, credentials.type,
 
603
                                   ctypes.cast(credentials._c_object,
 
604
                                               ctypes.c_void_p))
 
605
            self.credentials = credentials
 
606
 
 
607
        def __del__(self):
 
608
            gnutls.deinit(self._c_object)
 
609
 
 
610
        def handshake(self):
 
611
            return gnutls.handshake(self._c_object)
 
612
 
 
613
        def send(self, data):
 
614
            data = bytes(data)
 
615
            data_len = len(data)
 
616
            while data_len > 0:
 
617
                data_len -= gnutls.record_send(self._c_object,
 
618
                                               data[-data_len:],
 
619
                                               data_len)
 
620
 
 
621
        def bye(self):
 
622
            return gnutls.bye(self._c_object, gnutls.SHUT_RDWR)
 
623
 
 
624
    # Error handling functions
 
625
    def _error_code(result):
 
626
        """A function to raise exceptions on errors, suitable
 
627
        for the 'restype' attribute on ctypes functions"""
 
628
        if result >= 0:
 
629
            return result
 
630
        if result == gnutls.E_NO_CERTIFICATE_FOUND:
 
631
            raise gnutls.CertificateSecurityError(code=result)
 
632
        raise gnutls.Error(code=result)
 
633
 
 
634
    def _retry_on_error(result, func, arguments):
 
635
        """A function to retry on some errors, suitable
 
636
        for the 'errcheck' attribute on ctypes functions"""
 
637
        while result < 0:
 
638
            if result not in (gnutls.E_INTERRUPTED, gnutls.E_AGAIN):
 
639
                return _error_code(result)
 
640
            result = func(*arguments)
 
641
        return result
 
642
 
 
643
    # Unless otherwise indicated, the function declarations below are
 
644
    # all from the gnutls/gnutls.h C header file.
 
645
 
 
646
    # Functions
 
647
    priority_set_direct = _library.gnutls_priority_set_direct
 
648
    priority_set_direct.argtypes = [session_t, ctypes.c_char_p,
 
649
                                    ctypes.POINTER(ctypes.c_char_p)]
 
650
    priority_set_direct.restype = _error_code
 
651
 
 
652
    init = _library.gnutls_init
 
653
    init.argtypes = [ctypes.POINTER(session_t), ctypes.c_int]
 
654
    init.restype = _error_code
 
655
 
 
656
    set_default_priority = _library.gnutls_set_default_priority
 
657
    set_default_priority.argtypes = [session_t]
 
658
    set_default_priority.restype = _error_code
 
659
 
 
660
    record_send = _library.gnutls_record_send
 
661
    record_send.argtypes = [session_t, ctypes.c_void_p,
 
662
                            ctypes.c_size_t]
 
663
    record_send.restype = ctypes.c_ssize_t
 
664
    record_send.errcheck = _retry_on_error
 
665
 
 
666
    certificate_allocate_credentials = (
 
667
        _library.gnutls_certificate_allocate_credentials)
 
668
    certificate_allocate_credentials.argtypes = [
 
669
        ctypes.POINTER(certificate_credentials_t)]
 
670
    certificate_allocate_credentials.restype = _error_code
 
671
 
 
672
    certificate_free_credentials = (
 
673
        _library.gnutls_certificate_free_credentials)
 
674
    certificate_free_credentials.argtypes = [
 
675
        certificate_credentials_t]
 
676
    certificate_free_credentials.restype = None
 
677
 
 
678
    handshake_set_private_extensions = (
 
679
        _library.gnutls_handshake_set_private_extensions)
 
680
    handshake_set_private_extensions.argtypes = [session_t,
 
681
                                                 ctypes.c_int]
 
682
    handshake_set_private_extensions.restype = None
 
683
 
 
684
    credentials_set = _library.gnutls_credentials_set
 
685
    credentials_set.argtypes = [session_t, credentials_type_t,
 
686
                                ctypes.c_void_p]
 
687
    credentials_set.restype = _error_code
 
688
 
 
689
    strerror = _library.gnutls_strerror
 
690
    strerror.argtypes = [ctypes.c_int]
 
691
    strerror.restype = ctypes.c_char_p
 
692
 
 
693
    certificate_type_get = _library.gnutls_certificate_type_get
 
694
    certificate_type_get.argtypes = [session_t]
 
695
    certificate_type_get.restype = _error_code
 
696
 
 
697
    certificate_get_peers = _library.gnutls_certificate_get_peers
 
698
    certificate_get_peers.argtypes = [session_t,
 
699
                                      ctypes.POINTER(ctypes.c_uint)]
 
700
    certificate_get_peers.restype = ctypes.POINTER(datum_t)
 
701
 
 
702
    global_set_log_level = _library.gnutls_global_set_log_level
 
703
    global_set_log_level.argtypes = [ctypes.c_int]
 
704
    global_set_log_level.restype = None
 
705
 
 
706
    global_set_log_function = _library.gnutls_global_set_log_function
 
707
    global_set_log_function.argtypes = [log_func]
 
708
    global_set_log_function.restype = None
 
709
 
 
710
    deinit = _library.gnutls_deinit
 
711
    deinit.argtypes = [session_t]
 
712
    deinit.restype = None
 
713
 
 
714
    handshake = _library.gnutls_handshake
 
715
    handshake.argtypes = [session_t]
 
716
    handshake.restype = _error_code
 
717
    handshake.errcheck = _retry_on_error
 
718
 
 
719
    transport_set_ptr = _library.gnutls_transport_set_ptr
 
720
    transport_set_ptr.argtypes = [session_t, transport_ptr_t]
 
721
    transport_set_ptr.restype = None
 
722
 
 
723
    bye = _library.gnutls_bye
 
724
    bye.argtypes = [session_t, close_request_t]
 
725
    bye.restype = _error_code
 
726
    bye.errcheck = _retry_on_error
 
727
 
 
728
    check_version = _library.gnutls_check_version
 
729
    check_version.argtypes = [ctypes.c_char_p]
 
730
    check_version.restype = ctypes.c_char_p
 
731
 
 
732
    _need_version = b"3.3.0"
 
733
    if check_version(_need_version) is None:
 
734
        raise self.Error("Needs GnuTLS {} or later"
 
735
                         .format(_need_version))
 
736
 
 
737
    _tls_rawpk_version = b"3.6.6"
 
738
    has_rawpk = bool(check_version(_tls_rawpk_version))
 
739
 
 
740
    if has_rawpk:
 
741
        # Types
 
742
        class pubkey_st(ctypes.Structure):
 
743
            _fields = []
 
744
        pubkey_t = ctypes.POINTER(pubkey_st)
 
745
 
 
746
        x509_crt_fmt_t = ctypes.c_int
 
747
 
 
748
        # All the function declarations below are from gnutls/abstract.h
 
749
        pubkey_init = _library.gnutls_pubkey_init
 
750
        pubkey_init.argtypes = [ctypes.POINTER(pubkey_t)]
 
751
        pubkey_init.restype = _error_code
 
752
 
 
753
        pubkey_import = _library.gnutls_pubkey_import
 
754
        pubkey_import.argtypes = [pubkey_t, ctypes.POINTER(datum_t),
 
755
                                  x509_crt_fmt_t]
 
756
        pubkey_import.restype = _error_code
 
757
 
 
758
        pubkey_get_key_id = _library.gnutls_pubkey_get_key_id
 
759
        pubkey_get_key_id.argtypes = [pubkey_t, ctypes.c_int,
 
760
                                      ctypes.POINTER(ctypes.c_ubyte),
 
761
                                      ctypes.POINTER(ctypes.c_size_t)]
 
762
        pubkey_get_key_id.restype = _error_code
 
763
 
 
764
        pubkey_deinit = _library.gnutls_pubkey_deinit
 
765
        pubkey_deinit.argtypes = [pubkey_t]
 
766
        pubkey_deinit.restype = None
 
767
    else:
 
768
        # All the function declarations below are from gnutls/openpgp.h
 
769
 
 
770
        openpgp_crt_init = _library.gnutls_openpgp_crt_init
 
771
        openpgp_crt_init.argtypes = [ctypes.POINTER(openpgp_crt_t)]
 
772
        openpgp_crt_init.restype = _error_code
 
773
 
 
774
        openpgp_crt_import = _library.gnutls_openpgp_crt_import
 
775
        openpgp_crt_import.argtypes = [openpgp_crt_t,
 
776
                                       ctypes.POINTER(datum_t),
 
777
                                       openpgp_crt_fmt_t]
 
778
        openpgp_crt_import.restype = _error_code
 
779
 
 
780
        openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self
 
781
        openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,
 
782
                                            ctypes.POINTER(ctypes.c_uint)]
 
783
        openpgp_crt_verify_self.restype = _error_code
 
784
 
 
785
        openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit
 
786
        openpgp_crt_deinit.argtypes = [openpgp_crt_t]
 
787
        openpgp_crt_deinit.restype = None
 
788
 
 
789
        openpgp_crt_get_fingerprint = (
 
790
            _library.gnutls_openpgp_crt_get_fingerprint)
 
791
        openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,
 
792
                                                ctypes.c_void_p,
 
793
                                                ctypes.POINTER(
 
794
                                                    ctypes.c_size_t)]
 
795
        openpgp_crt_get_fingerprint.restype = _error_code
 
796
 
 
797
    if check_version("3.6.4"):
 
798
        certificate_type_get2 = _library.gnutls_certificate_type_get2
 
799
        certificate_type_get2.argtypes = [session_t, ctypes.c_int]
 
800
        certificate_type_get2.restype = _error_code
 
801
 
 
802
    # Remove non-public functions
 
803
    del _error_code, _retry_on_error
 
804
 
 
805
 
 
806
def call_pipe(connection,       # : multiprocessing.Connection
 
807
              func, *args, **kwargs):
 
808
    """This function is meant to be called by multiprocessing.Process
 
809
 
 
810
    This function runs func(*args, **kwargs), and writes the resulting
 
811
    return value on the provided multiprocessing.Connection.
 
812
    """
 
813
    connection.send(func(*args, **kwargs))
 
814
    connection.close()
161
815
 
162
816
 
163
817
class Client(object):
164
818
    """A representation of a client host served by this server.
 
819
 
165
820
    Attributes:
166
 
    name:      string; from the config file, used in log messages
167
 
    fingerprint: string (40 or 32 hexadecimal digits); used to
168
 
                 uniquely identify the client
169
 
    secret:    bytestring; sent verbatim (over TLS) to client
170
 
    host:      string; available for use by the checker command
171
 
    created:   datetime.datetime(); object creation, not client host
172
 
    last_checked_ok: datetime.datetime() or None if not yet checked OK
173
 
    timeout:   datetime.timedelta(); How long from last_checked_ok
174
 
                                     until this client is invalid
175
 
    interval:  datetime.timedelta(); How often to start a new checker
176
 
    stop_hook: If set, called by stop() as stop_hook(self)
177
 
    checker:   subprocess.Popen(); a running checker process used
178
 
                                   to see if the client lives.
179
 
                                   'None' if no process is running.
180
 
    checker_initiator_tag: a gobject event source tag, or None
181
 
    stop_initiator_tag:    - '' -
182
 
    checker_callback_tag:  - '' -
183
 
    checker_command: string; External command which is run to check if
184
 
                     client lives.  %() expansions are done at
 
821
    approved:   bool(); 'None' if not yet approved/disapproved
 
822
    approval_delay: datetime.timedelta(); Time to wait for approval
 
823
    approval_duration: datetime.timedelta(); Duration of one approval
 
824
    checker:    subprocess.Popen(); a running checker process used
 
825
                                    to see if the client lives.
 
826
                                    'None' if no process is running.
 
827
    checker_callback_tag: a GLib event source tag, or None
 
828
    checker_command: string; External command which is run to check
 
829
                     if client lives.  %() expansions are done at
185
830
                     runtime with vars(self) as dict, so that for
186
831
                     instance %(name)s can be used in the command.
187
 
    Private attibutes:
188
 
    _timeout: Real variable for 'timeout'
189
 
    _interval: Real variable for 'interval'
190
 
    _timeout_milliseconds: Used when calling gobject.timeout_add()
191
 
    _interval_milliseconds: - '' -
 
832
    checker_initiator_tag: a GLib event source tag, or None
 
833
    created:    datetime.datetime(); (UTC) object creation
 
834
    client_structure: Object describing what attributes a client has
 
835
                      and is used for storing the client at exit
 
836
    current_checker_command: string; current running checker_command
 
837
    disable_initiator_tag: a GLib event source tag, or None
 
838
    enabled:    bool()
 
839
    fingerprint: string (40 or 32 hexadecimal digits); used to
 
840
                 uniquely identify an OpenPGP client
 
841
    key_id: string (64 hexadecimal digits); used to uniquely identify
 
842
            a client using raw public keys
 
843
    host:       string; available for use by the checker command
 
844
    interval:   datetime.timedelta(); How often to start a new checker
 
845
    last_approval_request: datetime.datetime(); (UTC) or None
 
846
    last_checked_ok: datetime.datetime(); (UTC) or None
 
847
    last_checker_status: integer between 0 and 255 reflecting exit
 
848
                         status of last checker. -1 reflects crashed
 
849
                         checker, -2 means no checker completed yet.
 
850
    last_checker_signal: The signal which killed the last checker, if
 
851
                         last_checker_status is -1
 
852
    last_enabled: datetime.datetime(); (UTC) or None
 
853
    name:       string; from the config file, used in log messages and
 
854
                        D-Bus identifiers
 
855
    secret:     bytestring; sent verbatim (over TLS) to client
 
856
    timeout:    datetime.timedelta(); How long from last_checked_ok
 
857
                                      until this client is disabled
 
858
    extended_timeout:   extra long timeout when secret has been sent
 
859
    runtime_expansions: Allowed attributes for runtime expansion.
 
860
    expires:    datetime.datetime(); time (UTC) when a client will be
 
861
                disabled, or None
 
862
    server_settings: The server_settings dict from main()
192
863
    """
193
 
    def _set_timeout(self, timeout):
194
 
        "Setter function for 'timeout' attribute"
195
 
        self._timeout = timeout
196
 
        self._timeout_milliseconds = ((self.timeout.days
197
 
                                       * 24 * 60 * 60 * 1000)
198
 
                                      + (self.timeout.seconds * 1000)
199
 
                                      + (self.timeout.microseconds
200
 
                                         // 1000))
201
 
    timeout = property(lambda self: self._timeout,
202
 
                       _set_timeout)
203
 
    del _set_timeout
204
 
    def _set_interval(self, interval):
205
 
        "Setter function for 'interval' attribute"
206
 
        self._interval = interval
207
 
        self._interval_milliseconds = ((self.interval.days
208
 
                                        * 24 * 60 * 60 * 1000)
209
 
                                       + (self.interval.seconds
210
 
                                          * 1000)
211
 
                                       + (self.interval.microseconds
212
 
                                          // 1000))
213
 
    interval = property(lambda self: self._interval,
214
 
                        _set_interval)
215
 
    del _set_interval
216
 
    def __init__(self, name = None, stop_hook=None, config={}):
217
 
        """Note: the 'checker' key in 'config' sets the
218
 
        'checker_command' attribute and *not* the 'checker'
219
 
        attribute."""
 
864
 
 
865
    runtime_expansions = ("approval_delay", "approval_duration",
 
866
                          "created", "enabled", "expires", "key_id",
 
867
                          "fingerprint", "host", "interval",
 
868
                          "last_approval_request", "last_checked_ok",
 
869
                          "last_enabled", "name", "timeout")
 
870
    client_defaults = {
 
871
        "timeout": "PT5M",
 
872
        "extended_timeout": "PT15M",
 
873
        "interval": "PT2M",
 
874
        "checker": "fping -q -- %%(host)s",
 
875
        "host": "",
 
876
        "approval_delay": "PT0S",
 
877
        "approval_duration": "PT1S",
 
878
        "approved_by_default": "True",
 
879
        "enabled": "True",
 
880
    }
 
881
 
 
882
    @staticmethod
 
883
    def config_parser(config):
 
884
        """Construct a new dict of client settings of this form:
 
885
        { client_name: {setting_name: value, ...}, ...}
 
886
        with exceptions for any special settings as defined above.
 
887
        NOTE: Must be a pure function. Must return the same result
 
888
        value given the same arguments.
 
889
        """
 
890
        settings = {}
 
891
        for client_name in config.sections():
 
892
            section = dict(config.items(client_name))
 
893
            client = settings[client_name] = {}
 
894
 
 
895
            client["host"] = section["host"]
 
896
            # Reformat values from string types to Python types
 
897
            client["approved_by_default"] = config.getboolean(
 
898
                client_name, "approved_by_default")
 
899
            client["enabled"] = config.getboolean(client_name,
 
900
                                                  "enabled")
 
901
 
 
902
            # Uppercase and remove spaces from key_id and fingerprint
 
903
            # for later comparison purposes with return value from the
 
904
            # key_id() and fingerprint() functions
 
905
            client["key_id"] = (section.get("key_id", "").upper()
 
906
                                .replace(" ", ""))
 
907
            client["fingerprint"] = (section["fingerprint"].upper()
 
908
                                     .replace(" ", ""))
 
909
            if "secret" in section:
 
910
                client["secret"] = codecs.decode(section["secret"]
 
911
                                                 .encode("utf-8"),
 
912
                                                 "base64")
 
913
            elif "secfile" in section:
 
914
                with open(os.path.expanduser(os.path.expandvars
 
915
                                             (section["secfile"])),
 
916
                          "rb") as secfile:
 
917
                    client["secret"] = secfile.read()
 
918
            else:
 
919
                raise TypeError("No secret or secfile for section {}"
 
920
                                .format(section))
 
921
            client["timeout"] = string_to_delta(section["timeout"])
 
922
            client["extended_timeout"] = string_to_delta(
 
923
                section["extended_timeout"])
 
924
            client["interval"] = string_to_delta(section["interval"])
 
925
            client["approval_delay"] = string_to_delta(
 
926
                section["approval_delay"])
 
927
            client["approval_duration"] = string_to_delta(
 
928
                section["approval_duration"])
 
929
            client["checker_command"] = section["checker"]
 
930
            client["last_approval_request"] = None
 
931
            client["last_checked_ok"] = None
 
932
            client["last_checker_status"] = -2
 
933
 
 
934
        return settings
 
935
 
 
936
    def __init__(self, settings, name=None, server_settings=None):
220
937
        self.name = name
221
 
        logger.debug(u"Creating client %r", self.name)
222
 
        # Uppercase and remove spaces from fingerprint for later
223
 
        # comparison purposes with return value from the fingerprint()
224
 
        # function
225
 
        self.fingerprint = config["fingerprint"].upper()\
226
 
                           .replace(u" ", u"")
227
 
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
228
 
        if "secret" in config:
229
 
            self.secret = config["secret"].decode(u"base64")
230
 
        elif "secfile" in config:
231
 
            sf = open(config["secfile"])
232
 
            self.secret = sf.read()
233
 
            sf.close()
 
938
        if server_settings is None:
 
939
            server_settings = {}
 
940
        self.server_settings = server_settings
 
941
        # adding all client settings
 
942
        for setting, value in settings.items():
 
943
            setattr(self, setting, value)
 
944
 
 
945
        if self.enabled:
 
946
            if not hasattr(self, "last_enabled"):
 
947
                self.last_enabled = datetime.datetime.utcnow()
 
948
            if not hasattr(self, "expires"):
 
949
                self.expires = (datetime.datetime.utcnow()
 
950
                                + self.timeout)
234
951
        else:
235
 
            raise TypeError(u"No secret or secfile for client %s"
236
 
                            % self.name)
237
 
        self.host = config.get("host", "")
238
 
        self.created = datetime.datetime.now()
239
 
        self.last_checked_ok = None
240
 
        self.timeout = string_to_delta(config["timeout"])
241
 
        self.interval = string_to_delta(config["interval"])
242
 
        self.stop_hook = stop_hook
 
952
            self.last_enabled = None
 
953
            self.expires = None
 
954
 
 
955
        logger.debug("Creating client %r", self.name)
 
956
        logger.debug("  Key ID: %s", self.key_id)
 
957
        logger.debug("  Fingerprint: %s", self.fingerprint)
 
958
        self.created = settings.get("created",
 
959
                                    datetime.datetime.utcnow())
 
960
 
 
961
        # attributes specific for this server instance
243
962
        self.checker = None
244
963
        self.checker_initiator_tag = None
245
 
        self.stop_initiator_tag = None
 
964
        self.disable_initiator_tag = None
246
965
        self.checker_callback_tag = None
247
 
        self.check_command = config["checker"]
248
 
    def start(self):
 
966
        self.current_checker_command = None
 
967
        self.approved = None
 
968
        self.approvals_pending = 0
 
969
        self.changedstate = multiprocessing_manager.Condition(
 
970
            multiprocessing_manager.Lock())
 
971
        self.client_structure = [attr
 
972
                                 for attr in self.__dict__.keys()
 
973
                                 if not attr.startswith("_")]
 
974
        self.client_structure.append("client_structure")
 
975
 
 
976
        for name, t in inspect.getmembers(
 
977
                type(self), lambda obj: isinstance(obj, property)):
 
978
            if not name.startswith("_"):
 
979
                self.client_structure.append(name)
 
980
 
 
981
    # Send notice to process children that client state has changed
 
982
    def send_changedstate(self):
 
983
        with self.changedstate:
 
984
            self.changedstate.notify_all()
 
985
 
 
986
    def enable(self):
249
987
        """Start this client's checker and timeout hooks"""
 
988
        if getattr(self, "enabled", False):
 
989
            # Already enabled
 
990
            return
 
991
        self.expires = datetime.datetime.utcnow() + self.timeout
 
992
        self.enabled = True
 
993
        self.last_enabled = datetime.datetime.utcnow()
 
994
        self.init_checker()
 
995
        self.send_changedstate()
 
996
 
 
997
    def disable(self, quiet=True):
 
998
        """Disable this client."""
 
999
        if not getattr(self, "enabled", False):
 
1000
            return False
 
1001
        if not quiet:
 
1002
            logger.info("Disabling client %s", self.name)
 
1003
        if getattr(self, "disable_initiator_tag", None) is not None:
 
1004
            GLib.source_remove(self.disable_initiator_tag)
 
1005
            self.disable_initiator_tag = None
 
1006
        self.expires = None
 
1007
        if getattr(self, "checker_initiator_tag", None) is not None:
 
1008
            GLib.source_remove(self.checker_initiator_tag)
 
1009
            self.checker_initiator_tag = None
 
1010
        self.stop_checker()
 
1011
        self.enabled = False
 
1012
        if not quiet:
 
1013
            self.send_changedstate()
 
1014
        # Do not run this again if called by a GLib.timeout_add
 
1015
        return False
 
1016
 
 
1017
    def __del__(self):
 
1018
        self.disable()
 
1019
 
 
1020
    def init_checker(self):
250
1021
        # Schedule a new checker to be started an 'interval' from now,
251
1022
        # and every interval from then on.
252
 
        self.checker_initiator_tag = gobject.timeout_add\
253
 
                                     (self._interval_milliseconds,
254
 
                                      self.start_checker)
 
1023
        if self.checker_initiator_tag is not None:
 
1024
            GLib.source_remove(self.checker_initiator_tag)
 
1025
        self.checker_initiator_tag = GLib.timeout_add(
 
1026
            int(self.interval.total_seconds() * 1000),
 
1027
            self.start_checker)
 
1028
        # Schedule a disable() when 'timeout' has passed
 
1029
        if self.disable_initiator_tag is not None:
 
1030
            GLib.source_remove(self.disable_initiator_tag)
 
1031
        self.disable_initiator_tag = GLib.timeout_add(
 
1032
            int(self.timeout.total_seconds() * 1000), self.disable)
255
1033
        # Also start a new checker *right now*.
256
1034
        self.start_checker()
257
 
        # Schedule a stop() when 'timeout' has passed
258
 
        self.stop_initiator_tag = gobject.timeout_add\
259
 
                                  (self._timeout_milliseconds,
260
 
                                   self.stop)
261
 
    def stop(self):
262
 
        """Stop this client.
263
 
        The possibility that a client might be restarted is left open,
264
 
        but not currently used."""
265
 
        # If this client doesn't have a secret, it is already stopped.
266
 
        if hasattr(self, "secret") and self.secret:
267
 
            logger.info(u"Stopping client %s", self.name)
268
 
            self.secret = None
269
 
        else:
270
 
            return False
271
 
        if getattr(self, "stop_initiator_tag", False):
272
 
            gobject.source_remove(self.stop_initiator_tag)
273
 
            self.stop_initiator_tag = None
274
 
        if getattr(self, "checker_initiator_tag", False):
275
 
            gobject.source_remove(self.checker_initiator_tag)
276
 
            self.checker_initiator_tag = None
277
 
        self.stop_checker()
278
 
        if self.stop_hook:
279
 
            self.stop_hook(self)
280
 
        # Do not run this again if called by a gobject.timeout_add
281
 
        return False
282
 
    def __del__(self):
283
 
        self.stop_hook = None
284
 
        self.stop()
285
 
    def checker_callback(self, pid, condition):
 
1035
 
 
1036
    def checker_callback(self, source, condition, connection,
 
1037
                         command):
286
1038
        """The checker has completed, so take appropriate actions."""
287
 
        now = datetime.datetime.now()
288
1039
        self.checker_callback_tag = None
289
1040
        self.checker = None
290
 
        if os.WIFEXITED(condition) \
291
 
               and (os.WEXITSTATUS(condition) == 0):
292
 
            logger.info(u"Checker for %(name)s succeeded",
293
 
                        vars(self))
294
 
            self.last_checked_ok = now
295
 
            gobject.source_remove(self.stop_initiator_tag)
296
 
            self.stop_initiator_tag = gobject.timeout_add\
297
 
                                      (self._timeout_milliseconds,
298
 
                                       self.stop)
299
 
        elif not os.WIFEXITED(condition):
300
 
            logger.warning(u"Checker for %(name)s crashed?",
 
1041
        # Read return code from connection (see call_pipe)
 
1042
        returncode = connection.recv()
 
1043
        connection.close()
 
1044
 
 
1045
        if returncode >= 0:
 
1046
            self.last_checker_status = returncode
 
1047
            self.last_checker_signal = None
 
1048
            if self.last_checker_status == 0:
 
1049
                logger.info("Checker for %(name)s succeeded",
 
1050
                            vars(self))
 
1051
                self.checked_ok()
 
1052
            else:
 
1053
                logger.info("Checker for %(name)s failed", vars(self))
 
1054
        else:
 
1055
            self.last_checker_status = -1
 
1056
            self.last_checker_signal = -returncode
 
1057
            logger.warning("Checker for %(name)s crashed?",
301
1058
                           vars(self))
302
 
        else:
303
 
            logger.info(u"Checker for %(name)s failed",
304
 
                        vars(self))
 
1059
        return False
 
1060
 
 
1061
    def checked_ok(self):
 
1062
        """Assert that the client has been seen, alive and well."""
 
1063
        self.last_checked_ok = datetime.datetime.utcnow()
 
1064
        self.last_checker_status = 0
 
1065
        self.last_checker_signal = None
 
1066
        self.bump_timeout()
 
1067
 
 
1068
    def bump_timeout(self, timeout=None):
 
1069
        """Bump up the timeout for this client."""
 
1070
        if timeout is None:
 
1071
            timeout = self.timeout
 
1072
        if self.disable_initiator_tag is not None:
 
1073
            GLib.source_remove(self.disable_initiator_tag)
 
1074
            self.disable_initiator_tag = None
 
1075
        if getattr(self, "enabled", False):
 
1076
            self.disable_initiator_tag = GLib.timeout_add(
 
1077
                int(timeout.total_seconds() * 1000), self.disable)
 
1078
            self.expires = datetime.datetime.utcnow() + timeout
 
1079
 
 
1080
    def need_approval(self):
 
1081
        self.last_approval_request = datetime.datetime.utcnow()
 
1082
 
305
1083
    def start_checker(self):
306
1084
        """Start a new checker subprocess if one is not running.
 
1085
 
307
1086
        If a checker already exists, leave it running and do
308
1087
        nothing."""
309
1088
        # The reason for not killing a running checker is that if we
310
 
        # did that, then if a checker (for some reason) started
311
 
        # running slowly and taking more than 'interval' time, the
312
 
        # client would inevitably timeout, since no checker would get
313
 
        # a chance to run to completion.  If we instead leave running
 
1089
        # did that, and if a checker (for some reason) started running
 
1090
        # slowly and taking more than 'interval' time, then the client
 
1091
        # would inevitably timeout, since no checker would get a
 
1092
        # chance to run to completion.  If we instead leave running
314
1093
        # checkers alone, the checker would have to take more time
315
 
        # than 'timeout' for the client to be declared invalid, which
316
 
        # is as it should be.
 
1094
        # than 'timeout' for the client to be disabled, which is as it
 
1095
        # should be.
 
1096
 
 
1097
        if self.checker is not None and not self.checker.is_alive():
 
1098
            logger.warning("Checker was not alive; joining")
 
1099
            self.checker.join()
 
1100
            self.checker = None
 
1101
        # Start a new checker if needed
317
1102
        if self.checker is None:
318
 
            try:
319
 
                # In case check_command has exactly one % operator
320
 
                command = self.check_command % self.host
321
 
            except TypeError:
322
 
                # Escape attributes for the shell
323
 
                escaped_attrs = dict((key, re.escape(str(val)))
324
 
                                     for key, val in
325
 
                                     vars(self).iteritems())
326
 
                try:
327
 
                    command = self.check_command % escaped_attrs
328
 
                except TypeError, error:
329
 
                    logger.error(u'Could not format string "%s":'
330
 
                                 u' %s', self.check_command, error)
331
 
                    return True # Try again later
332
 
            try:
333
 
                logger.info(u"Starting checker %r for %s",
334
 
                            command, self.name)
335
 
                self.checker = subprocess.Popen(command,
336
 
                                                close_fds=True,
337
 
                                                shell=True, cwd="/")
338
 
                self.checker_callback_tag = gobject.child_watch_add\
339
 
                                            (self.checker.pid,
340
 
                                             self.checker_callback)
341
 
            except subprocess.OSError, error:
342
 
                logger.error(u"Failed to start subprocess: %s",
343
 
                             error)
344
 
        # Re-run this periodically if run by gobject.timeout_add
 
1103
            # Escape attributes for the shell
 
1104
            escaped_attrs = {
 
1105
                attr: re.escape(str(getattr(self, attr)))
 
1106
                for attr in self.runtime_expansions}
 
1107
            try:
 
1108
                command = self.checker_command % escaped_attrs
 
1109
            except TypeError as error:
 
1110
                logger.error('Could not format string "%s"',
 
1111
                             self.checker_command,
 
1112
                             exc_info=error)
 
1113
                return True     # Try again later
 
1114
            self.current_checker_command = command
 
1115
            logger.info("Starting checker %r for %s", command,
 
1116
                        self.name)
 
1117
            # We don't need to redirect stdout and stderr, since
 
1118
            # in normal mode, that is already done by daemon(),
 
1119
            # and in debug mode we don't want to.  (Stdin is
 
1120
            # always replaced by /dev/null.)
 
1121
            # The exception is when not debugging but nevertheless
 
1122
            # running in the foreground; use the previously
 
1123
            # created wnull.
 
1124
            popen_args = {"close_fds": True,
 
1125
                          "shell": True,
 
1126
                          "cwd": "/"}
 
1127
            if (not self.server_settings["debug"]
 
1128
                and self.server_settings["foreground"]):
 
1129
                popen_args.update({"stdout": wnull,
 
1130
                                   "stderr": wnull})
 
1131
            pipe = multiprocessing.Pipe(duplex=False)
 
1132
            self.checker = multiprocessing.Process(
 
1133
                target=call_pipe,
 
1134
                args=(pipe[1], subprocess.call, command),
 
1135
                kwargs=popen_args)
 
1136
            self.checker.start()
 
1137
            self.checker_callback_tag = GLib.io_add_watch(
 
1138
                pipe[0].fileno(), GLib.IO_IN,
 
1139
                self.checker_callback, pipe[0], command)
 
1140
        # Re-run this periodically if run by GLib.timeout_add
345
1141
        return True
 
1142
 
346
1143
    def stop_checker(self):
347
1144
        """Force the checker process, if any, to stop."""
348
1145
        if self.checker_callback_tag:
349
 
            gobject.source_remove(self.checker_callback_tag)
 
1146
            GLib.source_remove(self.checker_callback_tag)
350
1147
            self.checker_callback_tag = None
351
1148
        if getattr(self, "checker", None) is None:
352
1149
            return
353
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
354
 
        try:
355
 
            os.kill(self.checker.pid, signal.SIGTERM)
356
 
            #os.sleep(0.5)
357
 
            #if self.checker.poll() is None:
358
 
            #    os.kill(self.checker.pid, signal.SIGKILL)
359
 
        except OSError, error:
360
 
            if error.errno != errno.ESRCH: # No such process
361
 
                raise
 
1150
        logger.debug("Stopping checker for %(name)s", vars(self))
 
1151
        self.checker.terminate()
362
1152
        self.checker = None
363
 
    def still_valid(self):
364
 
        """Has the timeout not yet passed for this client?"""
365
 
        now = datetime.datetime.now()
366
 
        if self.last_checked_ok is None:
367
 
            return now < (self.created + self.timeout)
368
 
        else:
369
 
            return now < (self.last_checked_ok + self.timeout)
370
 
 
371
 
 
372
 
def peer_certificate(session):
373
 
    "Return the peer's OpenPGP certificate as a bytestring"
374
 
    # If not an OpenPGP certificate...
375
 
    if gnutls.library.functions.gnutls_certificate_type_get\
376
 
            (session._c_object) \
377
 
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
378
 
        # ...do the normal thing
379
 
        return session.peer_certificate
380
 
    list_size = ctypes.c_uint()
381
 
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
382
 
        (session._c_object, ctypes.byref(list_size))
383
 
    if list_size.value == 0:
384
 
        return None
385
 
    cert = cert_list[0]
386
 
    return ctypes.string_at(cert.data, cert.size)
387
 
 
388
 
 
389
 
def fingerprint(openpgp):
390
 
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
391
 
    # New GnuTLS "datum" with the OpenPGP public key
392
 
    datum = gnutls.library.types.gnutls_datum_t\
393
 
        (ctypes.cast(ctypes.c_char_p(openpgp),
394
 
                     ctypes.POINTER(ctypes.c_ubyte)),
395
 
         ctypes.c_uint(len(openpgp)))
396
 
    # New empty GnuTLS certificate
397
 
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
398
 
    gnutls.library.functions.gnutls_openpgp_crt_init\
399
 
        (ctypes.byref(crt))
400
 
    # Import the OpenPGP public key into the certificate
401
 
    gnutls.library.functions.gnutls_openpgp_crt_import\
402
 
                    (crt, ctypes.byref(datum),
403
 
                     gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
404
 
    # New buffer for the fingerprint
405
 
    buffer = ctypes.create_string_buffer(20)
406
 
    buffer_length = ctypes.c_size_t()
407
 
    # Get the fingerprint from the certificate into the buffer
408
 
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
409
 
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
410
 
    # Deinit the certificate
411
 
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
412
 
    # Convert the buffer to a Python bytestring
413
 
    fpr = ctypes.string_at(buffer, buffer_length.value)
414
 
    # Convert the bytestring to hexadecimal notation
415
 
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
416
 
    return hex_fpr
417
 
 
418
 
 
419
 
class tcp_handler(SocketServer.BaseRequestHandler, object):
420
 
    """A TCP request handler class.
421
 
    Instantiated by IPv6_TCPServer for each request to handle it.
 
1153
 
 
1154
 
 
1155
def dbus_service_property(dbus_interface,
 
1156
                          signature="v",
 
1157
                          access="readwrite",
 
1158
                          byte_arrays=False):
 
1159
    """Decorators for marking methods of a DBusObjectWithProperties to
 
1160
    become properties on the D-Bus.
 
1161
 
 
1162
    The decorated method will be called with no arguments by "Get"
 
1163
    and with one argument by "Set".
 
1164
 
 
1165
    The parameters, where they are supported, are the same as
 
1166
    dbus.service.method, except there is only "signature", since the
 
1167
    type from Get() and the type sent to Set() is the same.
 
1168
    """
 
1169
    # Encoding deeply encoded byte arrays is not supported yet by the
 
1170
    # "Set" method, so we fail early here:
 
1171
    if byte_arrays and signature != "ay":
 
1172
        raise ValueError("Byte arrays not supported for non-'ay'"
 
1173
                         " signature {!r}".format(signature))
 
1174
 
 
1175
    def decorator(func):
 
1176
        func._dbus_is_property = True
 
1177
        func._dbus_interface = dbus_interface
 
1178
        func._dbus_signature = signature
 
1179
        func._dbus_access = access
 
1180
        func._dbus_name = func.__name__
 
1181
        if func._dbus_name.endswith("_dbus_property"):
 
1182
            func._dbus_name = func._dbus_name[:-14]
 
1183
        func._dbus_get_args_options = {'byte_arrays': byte_arrays}
 
1184
        return func
 
1185
 
 
1186
    return decorator
 
1187
 
 
1188
 
 
1189
def dbus_interface_annotations(dbus_interface):
 
1190
    """Decorator for marking functions returning interface annotations
 
1191
 
 
1192
    Usage:
 
1193
 
 
1194
    @dbus_interface_annotations("org.example.Interface")
 
1195
    def _foo(self):  # Function name does not matter
 
1196
        return {"org.freedesktop.DBus.Deprecated": "true",
 
1197
                "org.freedesktop.DBus.Property.EmitsChangedSignal":
 
1198
                    "false"}
 
1199
    """
 
1200
 
 
1201
    def decorator(func):
 
1202
        func._dbus_is_interface = True
 
1203
        func._dbus_interface = dbus_interface
 
1204
        func._dbus_name = dbus_interface
 
1205
        return func
 
1206
 
 
1207
    return decorator
 
1208
 
 
1209
 
 
1210
def dbus_annotations(annotations):
 
1211
    """Decorator to annotate D-Bus methods, signals or properties
 
1212
    Usage:
 
1213
 
 
1214
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true",
 
1215
                       "org.freedesktop.DBus.Property."
 
1216
                       "EmitsChangedSignal": "false"})
 
1217
    @dbus_service_property("org.example.Interface", signature="b",
 
1218
                           access="r")
 
1219
    def Property_dbus_property(self):
 
1220
        return dbus.Boolean(False)
 
1221
 
 
1222
    See also the DBusObjectWithAnnotations class.
 
1223
    """
 
1224
 
 
1225
    def decorator(func):
 
1226
        func._dbus_annotations = annotations
 
1227
        return func
 
1228
 
 
1229
    return decorator
 
1230
 
 
1231
 
 
1232
class DBusPropertyException(dbus.exceptions.DBusException):
 
1233
    """A base class for D-Bus property-related exceptions
 
1234
    """
 
1235
    pass
 
1236
 
 
1237
 
 
1238
class DBusPropertyAccessException(DBusPropertyException):
 
1239
    """A property's access permissions disallows an operation.
 
1240
    """
 
1241
    pass
 
1242
 
 
1243
 
 
1244
class DBusPropertyNotFound(DBusPropertyException):
 
1245
    """An attempt was made to access a non-existing property.
 
1246
    """
 
1247
    pass
 
1248
 
 
1249
 
 
1250
class DBusObjectWithAnnotations(dbus.service.Object):
 
1251
    """A D-Bus object with annotations.
 
1252
 
 
1253
    Classes inheriting from this can use the dbus_annotations
 
1254
    decorator to add annotations to methods or signals.
 
1255
    """
 
1256
 
 
1257
    @staticmethod
 
1258
    def _is_dbus_thing(thing):
 
1259
        """Returns a function testing if an attribute is a D-Bus thing
 
1260
 
 
1261
        If called like _is_dbus_thing("method") it returns a function
 
1262
        suitable for use as predicate to inspect.getmembers().
 
1263
        """
 
1264
        return lambda obj: getattr(obj, "_dbus_is_{}".format(thing),
 
1265
                                   False)
 
1266
 
 
1267
    def _get_all_dbus_things(self, thing):
 
1268
        """Returns a generator of (name, attribute) pairs
 
1269
        """
 
1270
        return ((getattr(athing.__get__(self), "_dbus_name", name),
 
1271
                 athing.__get__(self))
 
1272
                for cls in self.__class__.__mro__
 
1273
                for name, athing in
 
1274
                inspect.getmembers(cls, self._is_dbus_thing(thing)))
 
1275
 
 
1276
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
 
1277
                         out_signature="s",
 
1278
                         path_keyword='object_path',
 
1279
                         connection_keyword='connection')
 
1280
    def Introspect(self, object_path, connection):
 
1281
        """Overloading of standard D-Bus method.
 
1282
 
 
1283
        Inserts annotation tags on methods and signals.
 
1284
        """
 
1285
        xmlstring = dbus.service.Object.Introspect(self, object_path,
 
1286
                                                   connection)
 
1287
        try:
 
1288
            document = xml.dom.minidom.parseString(xmlstring)
 
1289
 
 
1290
            for if_tag in document.getElementsByTagName("interface"):
 
1291
                # Add annotation tags
 
1292
                for typ in ("method", "signal"):
 
1293
                    for tag in if_tag.getElementsByTagName(typ):
 
1294
                        annots = dict()
 
1295
                        for name, prop in (self.
 
1296
                                           _get_all_dbus_things(typ)):
 
1297
                            if (name == tag.getAttribute("name")
 
1298
                                and prop._dbus_interface
 
1299
                                == if_tag.getAttribute("name")):
 
1300
                                annots.update(getattr(
 
1301
                                    prop, "_dbus_annotations", {}))
 
1302
                        for name, value in annots.items():
 
1303
                            ann_tag = document.createElement(
 
1304
                                "annotation")
 
1305
                            ann_tag.setAttribute("name", name)
 
1306
                            ann_tag.setAttribute("value", value)
 
1307
                            tag.appendChild(ann_tag)
 
1308
                # Add interface annotation tags
 
1309
                for annotation, value in dict(
 
1310
                    itertools.chain.from_iterable(
 
1311
                        annotations().items()
 
1312
                        for name, annotations
 
1313
                        in self._get_all_dbus_things("interface")
 
1314
                        if name == if_tag.getAttribute("name")
 
1315
                        )).items():
 
1316
                    ann_tag = document.createElement("annotation")
 
1317
                    ann_tag.setAttribute("name", annotation)
 
1318
                    ann_tag.setAttribute("value", value)
 
1319
                    if_tag.appendChild(ann_tag)
 
1320
                # Fix argument name for the Introspect method itself
 
1321
                if (if_tag.getAttribute("name")
 
1322
                    == dbus.INTROSPECTABLE_IFACE):
 
1323
                    for cn in if_tag.getElementsByTagName("method"):
 
1324
                        if cn.getAttribute("name") == "Introspect":
 
1325
                            for arg in cn.getElementsByTagName("arg"):
 
1326
                                if (arg.getAttribute("direction")
 
1327
                                    == "out"):
 
1328
                                    arg.setAttribute("name",
 
1329
                                                     "xml_data")
 
1330
            xmlstring = document.toxml("utf-8")
 
1331
            document.unlink()
 
1332
        except (AttributeError, xml.dom.DOMException,
 
1333
                xml.parsers.expat.ExpatError) as error:
 
1334
            logger.error("Failed to override Introspection method",
 
1335
                         exc_info=error)
 
1336
        return xmlstring
 
1337
 
 
1338
 
 
1339
class DBusObjectWithProperties(DBusObjectWithAnnotations):
 
1340
    """A D-Bus object with properties.
 
1341
 
 
1342
    Classes inheriting from this can use the dbus_service_property
 
1343
    decorator to expose methods as D-Bus properties.  It exposes the
 
1344
    standard Get(), Set(), and GetAll() methods on the D-Bus.
 
1345
    """
 
1346
 
 
1347
    def _get_dbus_property(self, interface_name, property_name):
 
1348
        """Returns a bound method if one exists which is a D-Bus
 
1349
        property with the specified name and interface.
 
1350
        """
 
1351
        for cls in self.__class__.__mro__:
 
1352
            for name, value in inspect.getmembers(
 
1353
                    cls, self._is_dbus_thing("property")):
 
1354
                if (value._dbus_name == property_name
 
1355
                    and value._dbus_interface == interface_name):
 
1356
                    return value.__get__(self)
 
1357
 
 
1358
        # No such property
 
1359
        raise DBusPropertyNotFound("{}:{}.{}".format(
 
1360
            self.dbus_object_path, interface_name, property_name))
 
1361
 
 
1362
    @classmethod
 
1363
    def _get_all_interface_names(cls):
 
1364
        """Get a sequence of all interfaces supported by an object"""
 
1365
        return (name for name in set(getattr(getattr(x, attr),
 
1366
                                             "_dbus_interface", None)
 
1367
                                     for x in (inspect.getmro(cls))
 
1368
                                     for attr in dir(x))
 
1369
                if name is not None)
 
1370
 
 
1371
    @dbus.service.method(dbus.PROPERTIES_IFACE,
 
1372
                         in_signature="ss",
 
1373
                         out_signature="v")
 
1374
    def Get(self, interface_name, property_name):
 
1375
        """Standard D-Bus property Get() method, see D-Bus standard.
 
1376
        """
 
1377
        prop = self._get_dbus_property(interface_name, property_name)
 
1378
        if prop._dbus_access == "write":
 
1379
            raise DBusPropertyAccessException(property_name)
 
1380
        value = prop()
 
1381
        if not hasattr(value, "variant_level"):
 
1382
            return value
 
1383
        return type(value)(value, variant_level=value.variant_level+1)
 
1384
 
 
1385
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
 
1386
    def Set(self, interface_name, property_name, value):
 
1387
        """Standard D-Bus property Set() method, see D-Bus standard.
 
1388
        """
 
1389
        prop = self._get_dbus_property(interface_name, property_name)
 
1390
        if prop._dbus_access == "read":
 
1391
            raise DBusPropertyAccessException(property_name)
 
1392
        if prop._dbus_get_args_options["byte_arrays"]:
 
1393
            # The byte_arrays option is not supported yet on
 
1394
            # signatures other than "ay".
 
1395
            if prop._dbus_signature != "ay":
 
1396
                raise ValueError("Byte arrays not supported for non-"
 
1397
                                 "'ay' signature {!r}"
 
1398
                                 .format(prop._dbus_signature))
 
1399
            value = dbus.ByteArray(b''.join(chr(byte)
 
1400
                                            for byte in value))
 
1401
        prop(value)
 
1402
 
 
1403
    @dbus.service.method(dbus.PROPERTIES_IFACE,
 
1404
                         in_signature="s",
 
1405
                         out_signature="a{sv}")
 
1406
    def GetAll(self, interface_name):
 
1407
        """Standard D-Bus property GetAll() method, see D-Bus
 
1408
        standard.
 
1409
 
 
1410
        Note: Will not include properties with access="write".
 
1411
        """
 
1412
        properties = {}
 
1413
        for name, prop in self._get_all_dbus_things("property"):
 
1414
            if (interface_name
 
1415
                and interface_name != prop._dbus_interface):
 
1416
                # Interface non-empty but did not match
 
1417
                continue
 
1418
            # Ignore write-only properties
 
1419
            if prop._dbus_access == "write":
 
1420
                continue
 
1421
            value = prop()
 
1422
            if not hasattr(value, "variant_level"):
 
1423
                properties[name] = value
 
1424
                continue
 
1425
            properties[name] = type(value)(
 
1426
                value, variant_level=value.variant_level + 1)
 
1427
        return dbus.Dictionary(properties, signature="sv")
 
1428
 
 
1429
    @dbus.service.signal(dbus.PROPERTIES_IFACE, signature="sa{sv}as")
 
1430
    def PropertiesChanged(self, interface_name, changed_properties,
 
1431
                          invalidated_properties):
 
1432
        """Standard D-Bus PropertiesChanged() signal, see D-Bus
 
1433
        standard.
 
1434
        """
 
1435
        pass
 
1436
 
 
1437
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
 
1438
                         out_signature="s",
 
1439
                         path_keyword='object_path',
 
1440
                         connection_keyword='connection')
 
1441
    def Introspect(self, object_path, connection):
 
1442
        """Overloading of standard D-Bus method.
 
1443
 
 
1444
        Inserts property tags and interface annotation tags.
 
1445
        """
 
1446
        xmlstring = DBusObjectWithAnnotations.Introspect(self,
 
1447
                                                         object_path,
 
1448
                                                         connection)
 
1449
        try:
 
1450
            document = xml.dom.minidom.parseString(xmlstring)
 
1451
 
 
1452
            def make_tag(document, name, prop):
 
1453
                e = document.createElement("property")
 
1454
                e.setAttribute("name", name)
 
1455
                e.setAttribute("type", prop._dbus_signature)
 
1456
                e.setAttribute("access", prop._dbus_access)
 
1457
                return e
 
1458
 
 
1459
            for if_tag in document.getElementsByTagName("interface"):
 
1460
                # Add property tags
 
1461
                for tag in (make_tag(document, name, prop)
 
1462
                            for name, prop
 
1463
                            in self._get_all_dbus_things("property")
 
1464
                            if prop._dbus_interface
 
1465
                            == if_tag.getAttribute("name")):
 
1466
                    if_tag.appendChild(tag)
 
1467
                # Add annotation tags for properties
 
1468
                for tag in if_tag.getElementsByTagName("property"):
 
1469
                    annots = dict()
 
1470
                    for name, prop in self._get_all_dbus_things(
 
1471
                            "property"):
 
1472
                        if (name == tag.getAttribute("name")
 
1473
                            and prop._dbus_interface
 
1474
                            == if_tag.getAttribute("name")):
 
1475
                            annots.update(getattr(
 
1476
                                prop, "_dbus_annotations", {}))
 
1477
                    for name, value in annots.items():
 
1478
                        ann_tag = document.createElement(
 
1479
                            "annotation")
 
1480
                        ann_tag.setAttribute("name", name)
 
1481
                        ann_tag.setAttribute("value", value)
 
1482
                        tag.appendChild(ann_tag)
 
1483
                # Add the names to the return values for the
 
1484
                # "org.freedesktop.DBus.Properties" methods
 
1485
                if (if_tag.getAttribute("name")
 
1486
                    == "org.freedesktop.DBus.Properties"):
 
1487
                    for cn in if_tag.getElementsByTagName("method"):
 
1488
                        if cn.getAttribute("name") == "Get":
 
1489
                            for arg in cn.getElementsByTagName("arg"):
 
1490
                                if (arg.getAttribute("direction")
 
1491
                                    == "out"):
 
1492
                                    arg.setAttribute("name", "value")
 
1493
                        elif cn.getAttribute("name") == "GetAll":
 
1494
                            for arg in cn.getElementsByTagName("arg"):
 
1495
                                if (arg.getAttribute("direction")
 
1496
                                    == "out"):
 
1497
                                    arg.setAttribute("name", "props")
 
1498
            xmlstring = document.toxml("utf-8")
 
1499
            document.unlink()
 
1500
        except (AttributeError, xml.dom.DOMException,
 
1501
                xml.parsers.expat.ExpatError) as error:
 
1502
            logger.error("Failed to override Introspection method",
 
1503
                         exc_info=error)
 
1504
        return xmlstring
 
1505
 
 
1506
 
 
1507
try:
 
1508
    dbus.OBJECT_MANAGER_IFACE
 
1509
except AttributeError:
 
1510
    dbus.OBJECT_MANAGER_IFACE = "org.freedesktop.DBus.ObjectManager"
 
1511
 
 
1512
 
 
1513
class DBusObjectWithObjectManager(DBusObjectWithAnnotations):
 
1514
    """A D-Bus object with an ObjectManager.
 
1515
 
 
1516
    Classes inheriting from this exposes the standard
 
1517
    GetManagedObjects call and the InterfacesAdded and
 
1518
    InterfacesRemoved signals on the standard
 
1519
    "org.freedesktop.DBus.ObjectManager" interface.
 
1520
 
 
1521
    Note: No signals are sent automatically; they must be sent
 
1522
    manually.
 
1523
    """
 
1524
    @dbus.service.method(dbus.OBJECT_MANAGER_IFACE,
 
1525
                         out_signature="a{oa{sa{sv}}}")
 
1526
    def GetManagedObjects(self):
 
1527
        """This function must be overridden"""
 
1528
        raise NotImplementedError()
 
1529
 
 
1530
    @dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,
 
1531
                         signature="oa{sa{sv}}")
 
1532
    def InterfacesAdded(self, object_path, interfaces_and_properties):
 
1533
        pass
 
1534
 
 
1535
    @dbus.service.signal(dbus.OBJECT_MANAGER_IFACE, signature="oas")
 
1536
    def InterfacesRemoved(self, object_path, interfaces):
 
1537
        pass
 
1538
 
 
1539
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
 
1540
                         out_signature="s",
 
1541
                         path_keyword='object_path',
 
1542
                         connection_keyword='connection')
 
1543
    def Introspect(self, object_path, connection):
 
1544
        """Overloading of standard D-Bus method.
 
1545
 
 
1546
        Override return argument name of GetManagedObjects to be
 
1547
        "objpath_interfaces_and_properties"
 
1548
        """
 
1549
        xmlstring = DBusObjectWithAnnotations.Introspect(self,
 
1550
                                                         object_path,
 
1551
                                                         connection)
 
1552
        try:
 
1553
            document = xml.dom.minidom.parseString(xmlstring)
 
1554
 
 
1555
            for if_tag in document.getElementsByTagName("interface"):
 
1556
                # Fix argument name for the GetManagedObjects method
 
1557
                if (if_tag.getAttribute("name")
 
1558
                    == dbus.OBJECT_MANAGER_IFACE):
 
1559
                    for cn in if_tag.getElementsByTagName("method"):
 
1560
                        if (cn.getAttribute("name")
 
1561
                            == "GetManagedObjects"):
 
1562
                            for arg in cn.getElementsByTagName("arg"):
 
1563
                                if (arg.getAttribute("direction")
 
1564
                                    == "out"):
 
1565
                                    arg.setAttribute(
 
1566
                                        "name",
 
1567
                                        "objpath_interfaces"
 
1568
                                        "_and_properties")
 
1569
            xmlstring = document.toxml("utf-8")
 
1570
            document.unlink()
 
1571
        except (AttributeError, xml.dom.DOMException,
 
1572
                xml.parsers.expat.ExpatError) as error:
 
1573
            logger.error("Failed to override Introspection method",
 
1574
                         exc_info=error)
 
1575
        return xmlstring
 
1576
 
 
1577
 
 
1578
def datetime_to_dbus(dt, variant_level=0):
 
1579
    """Convert a UTC datetime.datetime() to a D-Bus type."""
 
1580
    if dt is None:
 
1581
        return dbus.String("", variant_level=variant_level)
 
1582
    return dbus.String(dt.isoformat(), variant_level=variant_level)
 
1583
 
 
1584
 
 
1585
def alternate_dbus_interfaces(alt_interface_names, deprecate=True):
 
1586
    """A class decorator; applied to a subclass of
 
1587
    dbus.service.Object, it will add alternate D-Bus attributes with
 
1588
    interface names according to the "alt_interface_names" mapping.
 
1589
    Usage:
 
1590
 
 
1591
    @alternate_dbus_interfaces({"org.example.Interface":
 
1592
                                    "net.example.AlternateInterface"})
 
1593
    class SampleDBusObject(dbus.service.Object):
 
1594
        @dbus.service.method("org.example.Interface")
 
1595
        def SampleDBusMethod():
 
1596
            pass
 
1597
 
 
1598
    The above "SampleDBusMethod" on "SampleDBusObject" will be
 
1599
    reachable via two interfaces: "org.example.Interface" and
 
1600
    "net.example.AlternateInterface", the latter of which will have
 
1601
    its D-Bus annotation "org.freedesktop.DBus.Deprecated" set to
 
1602
    "true", unless "deprecate" is passed with a False value.
 
1603
 
 
1604
    This works for methods and signals, and also for D-Bus properties
 
1605
    (from DBusObjectWithProperties) and interfaces (from the
 
1606
    dbus_interface_annotations decorator).
 
1607
    """
 
1608
 
 
1609
    def wrapper(cls):
 
1610
        for orig_interface_name, alt_interface_name in (
 
1611
                alt_interface_names.items()):
 
1612
            attr = {}
 
1613
            interface_names = set()
 
1614
            # Go though all attributes of the class
 
1615
            for attrname, attribute in inspect.getmembers(cls):
 
1616
                # Ignore non-D-Bus attributes, and D-Bus attributes
 
1617
                # with the wrong interface name
 
1618
                if (not hasattr(attribute, "_dbus_interface")
 
1619
                    or not attribute._dbus_interface.startswith(
 
1620
                        orig_interface_name)):
 
1621
                    continue
 
1622
                # Create an alternate D-Bus interface name based on
 
1623
                # the current name
 
1624
                alt_interface = attribute._dbus_interface.replace(
 
1625
                    orig_interface_name, alt_interface_name)
 
1626
                interface_names.add(alt_interface)
 
1627
                # Is this a D-Bus signal?
 
1628
                if getattr(attribute, "_dbus_is_signal", False):
 
1629
                    # Extract the original non-method undecorated
 
1630
                    # function by black magic
 
1631
                    if sys.version_info.major == 2:
 
1632
                        nonmethod_func = (dict(
 
1633
                            zip(attribute.func_code.co_freevars,
 
1634
                                attribute.__closure__))
 
1635
                                          ["func"].cell_contents)
 
1636
                    else:
 
1637
                        nonmethod_func = (dict(
 
1638
                            zip(attribute.__code__.co_freevars,
 
1639
                                attribute.__closure__))
 
1640
                                          ["func"].cell_contents)
 
1641
                    # Create a new, but exactly alike, function
 
1642
                    # object, and decorate it to be a new D-Bus signal
 
1643
                    # with the alternate D-Bus interface name
 
1644
                    new_function = copy_function(nonmethod_func)
 
1645
                    new_function = (dbus.service.signal(
 
1646
                        alt_interface,
 
1647
                        attribute._dbus_signature)(new_function))
 
1648
                    # Copy annotations, if any
 
1649
                    try:
 
1650
                        new_function._dbus_annotations = dict(
 
1651
                            attribute._dbus_annotations)
 
1652
                    except AttributeError:
 
1653
                        pass
 
1654
 
 
1655
                    # Define a creator of a function to call both the
 
1656
                    # original and alternate functions, so both the
 
1657
                    # original and alternate signals gets sent when
 
1658
                    # the function is called
 
1659
                    def fixscope(func1, func2):
 
1660
                        """This function is a scope container to pass
 
1661
                        func1 and func2 to the "call_both" function
 
1662
                        outside of its arguments"""
 
1663
 
 
1664
                        @functools.wraps(func2)
 
1665
                        def call_both(*args, **kwargs):
 
1666
                            """This function will emit two D-Bus
 
1667
                            signals by calling func1 and func2"""
 
1668
                            func1(*args, **kwargs)
 
1669
                            func2(*args, **kwargs)
 
1670
                        # Make wrapper function look like a D-Bus
 
1671
                        # signal
 
1672
                        for name, attr in inspect.getmembers(func2):
 
1673
                            if name.startswith("_dbus_"):
 
1674
                                setattr(call_both, name, attr)
 
1675
 
 
1676
                        return call_both
 
1677
                    # Create the "call_both" function and add it to
 
1678
                    # the class
 
1679
                    attr[attrname] = fixscope(attribute, new_function)
 
1680
                # Is this a D-Bus method?
 
1681
                elif getattr(attribute, "_dbus_is_method", False):
 
1682
                    # Create a new, but exactly alike, function
 
1683
                    # object.  Decorate it to be a new D-Bus method
 
1684
                    # with the alternate D-Bus interface name.  Add it
 
1685
                    # to the class.
 
1686
                    attr[attrname] = (
 
1687
                        dbus.service.method(
 
1688
                            alt_interface,
 
1689
                            attribute._dbus_in_signature,
 
1690
                            attribute._dbus_out_signature)
 
1691
                        (copy_function(attribute)))
 
1692
                    # Copy annotations, if any
 
1693
                    try:
 
1694
                        attr[attrname]._dbus_annotations = dict(
 
1695
                            attribute._dbus_annotations)
 
1696
                    except AttributeError:
 
1697
                        pass
 
1698
                # Is this a D-Bus property?
 
1699
                elif getattr(attribute, "_dbus_is_property", False):
 
1700
                    # Create a new, but exactly alike, function
 
1701
                    # object, and decorate it to be a new D-Bus
 
1702
                    # property with the alternate D-Bus interface
 
1703
                    # name.  Add it to the class.
 
1704
                    attr[attrname] = (dbus_service_property(
 
1705
                        alt_interface, attribute._dbus_signature,
 
1706
                        attribute._dbus_access,
 
1707
                        attribute._dbus_get_args_options
 
1708
                        ["byte_arrays"])
 
1709
                                      (copy_function(attribute)))
 
1710
                    # Copy annotations, if any
 
1711
                    try:
 
1712
                        attr[attrname]._dbus_annotations = dict(
 
1713
                            attribute._dbus_annotations)
 
1714
                    except AttributeError:
 
1715
                        pass
 
1716
                # Is this a D-Bus interface?
 
1717
                elif getattr(attribute, "_dbus_is_interface", False):
 
1718
                    # Create a new, but exactly alike, function
 
1719
                    # object.  Decorate it to be a new D-Bus interface
 
1720
                    # with the alternate D-Bus interface name.  Add it
 
1721
                    # to the class.
 
1722
                    attr[attrname] = (
 
1723
                        dbus_interface_annotations(alt_interface)
 
1724
                        (copy_function(attribute)))
 
1725
            if deprecate:
 
1726
                # Deprecate all alternate interfaces
 
1727
                iname = "_AlternateDBusNames_interface_annotation{}"
 
1728
                for interface_name in interface_names:
 
1729
 
 
1730
                    @dbus_interface_annotations(interface_name)
 
1731
                    def func(self):
 
1732
                        return {"org.freedesktop.DBus.Deprecated":
 
1733
                                "true"}
 
1734
                    # Find an unused name
 
1735
                    for aname in (iname.format(i)
 
1736
                                  for i in itertools.count()):
 
1737
                        if aname not in attr:
 
1738
                            attr[aname] = func
 
1739
                            break
 
1740
            if interface_names:
 
1741
                # Replace the class with a new subclass of it with
 
1742
                # methods, signals, etc. as created above.
 
1743
                if sys.version_info.major == 2:
 
1744
                    cls = type(b"{}Alternate".format(cls.__name__),
 
1745
                               (cls, ), attr)
 
1746
                else:
 
1747
                    cls = type("{}Alternate".format(cls.__name__),
 
1748
                               (cls, ), attr)
 
1749
        return cls
 
1750
 
 
1751
    return wrapper
 
1752
 
 
1753
 
 
1754
@alternate_dbus_interfaces({"se.recompile.Mandos":
 
1755
                            "se.bsnet.fukt.Mandos"})
 
1756
class ClientDBus(Client, DBusObjectWithProperties):
 
1757
    """A Client class using D-Bus
 
1758
 
 
1759
    Attributes:
 
1760
    dbus_object_path: dbus.ObjectPath
 
1761
    bus: dbus.SystemBus()
 
1762
    """
 
1763
 
 
1764
    runtime_expansions = (Client.runtime_expansions
 
1765
                          + ("dbus_object_path", ))
 
1766
 
 
1767
    _interface = "se.recompile.Mandos.Client"
 
1768
 
 
1769
    # dbus.service.Object doesn't use super(), so we can't either.
 
1770
 
 
1771
    def __init__(self, bus=None, *args, **kwargs):
 
1772
        self.bus = bus
 
1773
        Client.__init__(self, *args, **kwargs)
 
1774
        # Only now, when this client is initialized, can it show up on
 
1775
        # the D-Bus
 
1776
        client_object_name = str(self.name).translate(
 
1777
            {ord("."): ord("_"),
 
1778
             ord("-"): ord("_")})
 
1779
        self.dbus_object_path = dbus.ObjectPath(
 
1780
            "/clients/" + client_object_name)
 
1781
        DBusObjectWithProperties.__init__(self, self.bus,
 
1782
                                          self.dbus_object_path)
 
1783
 
 
1784
    def notifychangeproperty(transform_func, dbus_name,
 
1785
                             type_func=lambda x: x,
 
1786
                             variant_level=1,
 
1787
                             invalidate_only=False,
 
1788
                             _interface=_interface):
 
1789
        """ Modify a variable so that it's a property which announces
 
1790
        its changes to DBus.
 
1791
 
 
1792
        transform_fun: Function that takes a value and a variant_level
 
1793
                       and transforms it to a D-Bus type.
 
1794
        dbus_name: D-Bus name of the variable
 
1795
        type_func: Function that transform the value before sending it
 
1796
                   to the D-Bus.  Default: no transform
 
1797
        variant_level: D-Bus variant level.  Default: 1
 
1798
        """
 
1799
        attrname = "_{}".format(dbus_name)
 
1800
 
 
1801
        def setter(self, value):
 
1802
            if hasattr(self, "dbus_object_path"):
 
1803
                if (not hasattr(self, attrname) or
 
1804
                    type_func(getattr(self, attrname, None))
 
1805
                    != type_func(value)):
 
1806
                    if invalidate_only:
 
1807
                        self.PropertiesChanged(
 
1808
                            _interface, dbus.Dictionary(),
 
1809
                            dbus.Array((dbus_name, )))
 
1810
                    else:
 
1811
                        dbus_value = transform_func(
 
1812
                            type_func(value),
 
1813
                            variant_level=variant_level)
 
1814
                        self.PropertyChanged(dbus.String(dbus_name),
 
1815
                                             dbus_value)
 
1816
                        self.PropertiesChanged(
 
1817
                            _interface,
 
1818
                            dbus.Dictionary({dbus.String(dbus_name):
 
1819
                                             dbus_value}),
 
1820
                            dbus.Array())
 
1821
            setattr(self, attrname, value)
 
1822
 
 
1823
        return property(lambda self: getattr(self, attrname), setter)
 
1824
 
 
1825
    expires = notifychangeproperty(datetime_to_dbus, "Expires")
 
1826
    approvals_pending = notifychangeproperty(dbus.Boolean,
 
1827
                                             "ApprovalPending",
 
1828
                                             type_func=bool)
 
1829
    enabled = notifychangeproperty(dbus.Boolean, "Enabled")
 
1830
    last_enabled = notifychangeproperty(datetime_to_dbus,
 
1831
                                        "LastEnabled")
 
1832
    checker = notifychangeproperty(
 
1833
        dbus.Boolean, "CheckerRunning",
 
1834
        type_func=lambda checker: checker is not None)
 
1835
    last_checked_ok = notifychangeproperty(datetime_to_dbus,
 
1836
                                           "LastCheckedOK")
 
1837
    last_checker_status = notifychangeproperty(dbus.Int16,
 
1838
                                               "LastCheckerStatus")
 
1839
    last_approval_request = notifychangeproperty(
 
1840
        datetime_to_dbus, "LastApprovalRequest")
 
1841
    approved_by_default = notifychangeproperty(dbus.Boolean,
 
1842
                                               "ApprovedByDefault")
 
1843
    approval_delay = notifychangeproperty(
 
1844
        dbus.UInt64, "ApprovalDelay",
 
1845
        type_func=lambda td: td.total_seconds() * 1000)
 
1846
    approval_duration = notifychangeproperty(
 
1847
        dbus.UInt64, "ApprovalDuration",
 
1848
        type_func=lambda td: td.total_seconds() * 1000)
 
1849
    host = notifychangeproperty(dbus.String, "Host")
 
1850
    timeout = notifychangeproperty(
 
1851
        dbus.UInt64, "Timeout",
 
1852
        type_func=lambda td: td.total_seconds() * 1000)
 
1853
    extended_timeout = notifychangeproperty(
 
1854
        dbus.UInt64, "ExtendedTimeout",
 
1855
        type_func=lambda td: td.total_seconds() * 1000)
 
1856
    interval = notifychangeproperty(
 
1857
        dbus.UInt64, "Interval",
 
1858
        type_func=lambda td: td.total_seconds() * 1000)
 
1859
    checker_command = notifychangeproperty(dbus.String, "Checker")
 
1860
    secret = notifychangeproperty(dbus.ByteArray, "Secret",
 
1861
                                  invalidate_only=True)
 
1862
 
 
1863
    del notifychangeproperty
 
1864
 
 
1865
    def __del__(self, *args, **kwargs):
 
1866
        try:
 
1867
            self.remove_from_connection()
 
1868
        except LookupError:
 
1869
            pass
 
1870
        if hasattr(DBusObjectWithProperties, "__del__"):
 
1871
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
 
1872
        Client.__del__(self, *args, **kwargs)
 
1873
 
 
1874
    def checker_callback(self, source, condition,
 
1875
                         connection, command, *args, **kwargs):
 
1876
        ret = Client.checker_callback(self, source, condition,
 
1877
                                      connection, command, *args,
 
1878
                                      **kwargs)
 
1879
        exitstatus = self.last_checker_status
 
1880
        if exitstatus >= 0:
 
1881
            # Emit D-Bus signal
 
1882
            self.CheckerCompleted(dbus.Int16(exitstatus),
 
1883
                                  # This is specific to GNU libC
 
1884
                                  dbus.Int64(exitstatus << 8),
 
1885
                                  dbus.String(command))
 
1886
        else:
 
1887
            # Emit D-Bus signal
 
1888
            self.CheckerCompleted(dbus.Int16(-1),
 
1889
                                  dbus.Int64(
 
1890
                                      # This is specific to GNU libC
 
1891
                                      (exitstatus << 8)
 
1892
                                      | self.last_checker_signal),
 
1893
                                  dbus.String(command))
 
1894
        return ret
 
1895
 
 
1896
    def start_checker(self, *args, **kwargs):
 
1897
        old_checker_pid = getattr(self.checker, "pid", None)
 
1898
        r = Client.start_checker(self, *args, **kwargs)
 
1899
        # Only if new checker process was started
 
1900
        if (self.checker is not None
 
1901
            and old_checker_pid != self.checker.pid):
 
1902
            # Emit D-Bus signal
 
1903
            self.CheckerStarted(self.current_checker_command)
 
1904
        return r
 
1905
 
 
1906
    def _reset_approved(self):
 
1907
        self.approved = None
 
1908
        return False
 
1909
 
 
1910
    def approve(self, value=True):
 
1911
        self.approved = value
 
1912
        GLib.timeout_add(int(self.approval_duration.total_seconds()
 
1913
                             * 1000), self._reset_approved)
 
1914
        self.send_changedstate()
 
1915
 
 
1916
    #  D-Bus methods, signals & properties
 
1917
 
 
1918
    #  Interfaces
 
1919
 
 
1920
    #  Signals
 
1921
 
 
1922
    # CheckerCompleted - signal
 
1923
    @dbus.service.signal(_interface, signature="nxs")
 
1924
    def CheckerCompleted(self, exitcode, waitstatus, command):
 
1925
        "D-Bus signal"
 
1926
        pass
 
1927
 
 
1928
    # CheckerStarted - signal
 
1929
    @dbus.service.signal(_interface, signature="s")
 
1930
    def CheckerStarted(self, command):
 
1931
        "D-Bus signal"
 
1932
        pass
 
1933
 
 
1934
    # PropertyChanged - signal
 
1935
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
 
1936
    @dbus.service.signal(_interface, signature="sv")
 
1937
    def PropertyChanged(self, property, value):
 
1938
        "D-Bus signal"
 
1939
        pass
 
1940
 
 
1941
    # GotSecret - signal
 
1942
    @dbus.service.signal(_interface)
 
1943
    def GotSecret(self):
 
1944
        """D-Bus signal
 
1945
        Is sent after a successful transfer of secret from the Mandos
 
1946
        server to mandos-client
 
1947
        """
 
1948
        pass
 
1949
 
 
1950
    # Rejected - signal
 
1951
    @dbus.service.signal(_interface, signature="s")
 
1952
    def Rejected(self, reason):
 
1953
        "D-Bus signal"
 
1954
        pass
 
1955
 
 
1956
    # NeedApproval - signal
 
1957
    @dbus.service.signal(_interface, signature="tb")
 
1958
    def NeedApproval(self, timeout, default):
 
1959
        "D-Bus signal"
 
1960
        return self.need_approval()
 
1961
 
 
1962
    #  Methods
 
1963
 
 
1964
    # Approve - method
 
1965
    @dbus.service.method(_interface, in_signature="b")
 
1966
    def Approve(self, value):
 
1967
        self.approve(value)
 
1968
 
 
1969
    # CheckedOK - method
 
1970
    @dbus.service.method(_interface)
 
1971
    def CheckedOK(self):
 
1972
        self.checked_ok()
 
1973
 
 
1974
    # Enable - method
 
1975
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
 
1976
    @dbus.service.method(_interface)
 
1977
    def Enable(self):
 
1978
        "D-Bus method"
 
1979
        self.enable()
 
1980
 
 
1981
    # StartChecker - method
 
1982
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
 
1983
    @dbus.service.method(_interface)
 
1984
    def StartChecker(self):
 
1985
        "D-Bus method"
 
1986
        self.start_checker()
 
1987
 
 
1988
    # Disable - method
 
1989
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
 
1990
    @dbus.service.method(_interface)
 
1991
    def Disable(self):
 
1992
        "D-Bus method"
 
1993
        self.disable()
 
1994
 
 
1995
    # StopChecker - method
 
1996
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
 
1997
    @dbus.service.method(_interface)
 
1998
    def StopChecker(self):
 
1999
        self.stop_checker()
 
2000
 
 
2001
    #  Properties
 
2002
 
 
2003
    # ApprovalPending - property
 
2004
    @dbus_service_property(_interface, signature="b", access="read")
 
2005
    def ApprovalPending_dbus_property(self):
 
2006
        return dbus.Boolean(bool(self.approvals_pending))
 
2007
 
 
2008
    # ApprovedByDefault - property
 
2009
    @dbus_service_property(_interface,
 
2010
                           signature="b",
 
2011
                           access="readwrite")
 
2012
    def ApprovedByDefault_dbus_property(self, value=None):
 
2013
        if value is None:       # get
 
2014
            return dbus.Boolean(self.approved_by_default)
 
2015
        self.approved_by_default = bool(value)
 
2016
 
 
2017
    # ApprovalDelay - property
 
2018
    @dbus_service_property(_interface,
 
2019
                           signature="t",
 
2020
                           access="readwrite")
 
2021
    def ApprovalDelay_dbus_property(self, value=None):
 
2022
        if value is None:       # get
 
2023
            return dbus.UInt64(self.approval_delay.total_seconds()
 
2024
                               * 1000)
 
2025
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
 
2026
 
 
2027
    # ApprovalDuration - property
 
2028
    @dbus_service_property(_interface,
 
2029
                           signature="t",
 
2030
                           access="readwrite")
 
2031
    def ApprovalDuration_dbus_property(self, value=None):
 
2032
        if value is None:       # get
 
2033
            return dbus.UInt64(self.approval_duration.total_seconds()
 
2034
                               * 1000)
 
2035
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
 
2036
 
 
2037
    # Name - property
 
2038
    @dbus_annotations(
 
2039
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
 
2040
    @dbus_service_property(_interface, signature="s", access="read")
 
2041
    def Name_dbus_property(self):
 
2042
        return dbus.String(self.name)
 
2043
 
 
2044
    # KeyID - property
 
2045
    @dbus_annotations(
 
2046
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
 
2047
    @dbus_service_property(_interface, signature="s", access="read")
 
2048
    def KeyID_dbus_property(self):
 
2049
        return dbus.String(self.key_id)
 
2050
 
 
2051
    # Fingerprint - property
 
2052
    @dbus_annotations(
 
2053
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
 
2054
    @dbus_service_property(_interface, signature="s", access="read")
 
2055
    def Fingerprint_dbus_property(self):
 
2056
        return dbus.String(self.fingerprint)
 
2057
 
 
2058
    # Host - property
 
2059
    @dbus_service_property(_interface,
 
2060
                           signature="s",
 
2061
                           access="readwrite")
 
2062
    def Host_dbus_property(self, value=None):
 
2063
        if value is None:       # get
 
2064
            return dbus.String(self.host)
 
2065
        self.host = str(value)
 
2066
 
 
2067
    # Created - property
 
2068
    @dbus_annotations(
 
2069
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
 
2070
    @dbus_service_property(_interface, signature="s", access="read")
 
2071
    def Created_dbus_property(self):
 
2072
        return datetime_to_dbus(self.created)
 
2073
 
 
2074
    # LastEnabled - property
 
2075
    @dbus_service_property(_interface, signature="s", access="read")
 
2076
    def LastEnabled_dbus_property(self):
 
2077
        return datetime_to_dbus(self.last_enabled)
 
2078
 
 
2079
    # Enabled - property
 
2080
    @dbus_service_property(_interface,
 
2081
                           signature="b",
 
2082
                           access="readwrite")
 
2083
    def Enabled_dbus_property(self, value=None):
 
2084
        if value is None:       # get
 
2085
            return dbus.Boolean(self.enabled)
 
2086
        if value:
 
2087
            self.enable()
 
2088
        else:
 
2089
            self.disable()
 
2090
 
 
2091
    # LastCheckedOK - property
 
2092
    @dbus_service_property(_interface,
 
2093
                           signature="s",
 
2094
                           access="readwrite")
 
2095
    def LastCheckedOK_dbus_property(self, value=None):
 
2096
        if value is not None:
 
2097
            self.checked_ok()
 
2098
            return
 
2099
        return datetime_to_dbus(self.last_checked_ok)
 
2100
 
 
2101
    # LastCheckerStatus - property
 
2102
    @dbus_service_property(_interface, signature="n", access="read")
 
2103
    def LastCheckerStatus_dbus_property(self):
 
2104
        return dbus.Int16(self.last_checker_status)
 
2105
 
 
2106
    # Expires - property
 
2107
    @dbus_service_property(_interface, signature="s", access="read")
 
2108
    def Expires_dbus_property(self):
 
2109
        return datetime_to_dbus(self.expires)
 
2110
 
 
2111
    # LastApprovalRequest - property
 
2112
    @dbus_service_property(_interface, signature="s", access="read")
 
2113
    def LastApprovalRequest_dbus_property(self):
 
2114
        return datetime_to_dbus(self.last_approval_request)
 
2115
 
 
2116
    # Timeout - property
 
2117
    @dbus_service_property(_interface,
 
2118
                           signature="t",
 
2119
                           access="readwrite")
 
2120
    def Timeout_dbus_property(self, value=None):
 
2121
        if value is None:       # get
 
2122
            return dbus.UInt64(self.timeout.total_seconds() * 1000)
 
2123
        old_timeout = self.timeout
 
2124
        self.timeout = datetime.timedelta(0, 0, 0, value)
 
2125
        # Reschedule disabling
 
2126
        if self.enabled:
 
2127
            now = datetime.datetime.utcnow()
 
2128
            self.expires += self.timeout - old_timeout
 
2129
            if self.expires <= now:
 
2130
                # The timeout has passed
 
2131
                self.disable()
 
2132
            else:
 
2133
                if (getattr(self, "disable_initiator_tag", None)
 
2134
                    is None):
 
2135
                    return
 
2136
                GLib.source_remove(self.disable_initiator_tag)
 
2137
                self.disable_initiator_tag = GLib.timeout_add(
 
2138
                    int((self.expires - now).total_seconds() * 1000),
 
2139
                    self.disable)
 
2140
 
 
2141
    # ExtendedTimeout - property
 
2142
    @dbus_service_property(_interface,
 
2143
                           signature="t",
 
2144
                           access="readwrite")
 
2145
    def ExtendedTimeout_dbus_property(self, value=None):
 
2146
        if value is None:       # get
 
2147
            return dbus.UInt64(self.extended_timeout.total_seconds()
 
2148
                               * 1000)
 
2149
        self.extended_timeout = datetime.timedelta(0, 0, 0, value)
 
2150
 
 
2151
    # Interval - property
 
2152
    @dbus_service_property(_interface,
 
2153
                           signature="t",
 
2154
                           access="readwrite")
 
2155
    def Interval_dbus_property(self, value=None):
 
2156
        if value is None:       # get
 
2157
            return dbus.UInt64(self.interval.total_seconds() * 1000)
 
2158
        self.interval = datetime.timedelta(0, 0, 0, value)
 
2159
        if getattr(self, "checker_initiator_tag", None) is None:
 
2160
            return
 
2161
        if self.enabled:
 
2162
            # Reschedule checker run
 
2163
            GLib.source_remove(self.checker_initiator_tag)
 
2164
            self.checker_initiator_tag = GLib.timeout_add(
 
2165
                value, self.start_checker)
 
2166
            self.start_checker()  # Start one now, too
 
2167
 
 
2168
    # Checker - property
 
2169
    @dbus_service_property(_interface,
 
2170
                           signature="s",
 
2171
                           access="readwrite")
 
2172
    def Checker_dbus_property(self, value=None):
 
2173
        if value is None:       # get
 
2174
            return dbus.String(self.checker_command)
 
2175
        self.checker_command = str(value)
 
2176
 
 
2177
    # CheckerRunning - property
 
2178
    @dbus_service_property(_interface,
 
2179
                           signature="b",
 
2180
                           access="readwrite")
 
2181
    def CheckerRunning_dbus_property(self, value=None):
 
2182
        if value is None:       # get
 
2183
            return dbus.Boolean(self.checker is not None)
 
2184
        if value:
 
2185
            self.start_checker()
 
2186
        else:
 
2187
            self.stop_checker()
 
2188
 
 
2189
    # ObjectPath - property
 
2190
    @dbus_annotations(
 
2191
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const",
 
2192
         "org.freedesktop.DBus.Deprecated": "true"})
 
2193
    @dbus_service_property(_interface, signature="o", access="read")
 
2194
    def ObjectPath_dbus_property(self):
 
2195
        return self.dbus_object_path  # is already a dbus.ObjectPath
 
2196
 
 
2197
    # Secret = property
 
2198
    @dbus_annotations(
 
2199
        {"org.freedesktop.DBus.Property.EmitsChangedSignal":
 
2200
         "invalidates"})
 
2201
    @dbus_service_property(_interface,
 
2202
                           signature="ay",
 
2203
                           access="write",
 
2204
                           byte_arrays=True)
 
2205
    def Secret_dbus_property(self, value):
 
2206
        self.secret = bytes(value)
 
2207
 
 
2208
    del _interface
 
2209
 
 
2210
 
 
2211
class ProxyClient(object):
 
2212
    def __init__(self, child_pipe, key_id, fpr, address):
 
2213
        self._pipe = child_pipe
 
2214
        self._pipe.send(('init', key_id, fpr, address))
 
2215
        if not self._pipe.recv():
 
2216
            raise KeyError(key_id or fpr)
 
2217
 
 
2218
    def __getattribute__(self, name):
 
2219
        if name == '_pipe':
 
2220
            return super(ProxyClient, self).__getattribute__(name)
 
2221
        self._pipe.send(('getattr', name))
 
2222
        data = self._pipe.recv()
 
2223
        if data[0] == 'data':
 
2224
            return data[1]
 
2225
        if data[0] == 'function':
 
2226
 
 
2227
            def func(*args, **kwargs):
 
2228
                self._pipe.send(('funcall', name, args, kwargs))
 
2229
                return self._pipe.recv()[1]
 
2230
 
 
2231
            return func
 
2232
 
 
2233
    def __setattr__(self, name, value):
 
2234
        if name == '_pipe':
 
2235
            return super(ProxyClient, self).__setattr__(name, value)
 
2236
        self._pipe.send(('setattr', name, value))
 
2237
 
 
2238
 
 
2239
class ClientHandler(socketserver.BaseRequestHandler, object):
 
2240
    """A class to handle client connections.
 
2241
 
 
2242
    Instantiated once for each connection to handle it.
422
2243
    Note: This will run in its own forked process."""
423
 
    
 
2244
 
424
2245
    def handle(self):
425
 
        logger.info(u"TCP connection from: %s",
426
 
                     unicode(self.client_address))
427
 
        session = gnutls.connection.ClientSession\
428
 
                  (self.request, gnutls.connection.X509Credentials())
429
 
        
430
 
        line = self.request.makefile().readline()
431
 
        logger.debug(u"Protocol version: %r", line)
432
 
        try:
433
 
            if int(line.strip().split()[0]) > 1:
434
 
                raise RuntimeError
435
 
        except (ValueError, IndexError, RuntimeError), error:
436
 
            logger.error(u"Unknown protocol version: %s", error)
437
 
            return
438
 
        
439
 
        # Note: gnutls.connection.X509Credentials is really a generic
440
 
        # GnuTLS certificate credentials object so long as no X.509
441
 
        # keys are added to it.  Therefore, we can use it here despite
442
 
        # using OpenPGP certificates.
443
 
        
444
 
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
445
 
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
446
 
        #                "+DHE-DSS"))
447
 
        priority = "NORMAL"             # Fallback default, since this
448
 
                                        # MUST be set.
449
 
        if self.server.settings["priority"]:
450
 
            priority = self.server.settings["priority"]
451
 
        gnutls.library.functions.gnutls_priority_set_direct\
452
 
            (session._c_object, priority, None);
453
 
        
454
 
        try:
455
 
            session.handshake()
456
 
        except gnutls.errors.GNUTLSError, error:
457
 
            logger.warning(u"Handshake failed: %s", error)
458
 
            # Do not run session.bye() here: the session is not
459
 
            # established.  Just abandon the request.
460
 
            return
461
 
        try:
462
 
            fpr = fingerprint(peer_certificate(session))
463
 
        except (TypeError, gnutls.errors.GNUTLSError), error:
464
 
            logger.warning(u"Bad certificate: %s", error)
465
 
            session.bye()
466
 
            return
467
 
        logger.debug(u"Fingerprint: %s", fpr)
468
 
        client = None
469
 
        for c in self.server.clients:
470
 
            if c.fingerprint == fpr:
471
 
                client = c
472
 
                break
473
 
        if not client:
474
 
            logger.warning(u"Client not found for fingerprint: %s",
475
 
                           fpr)
476
 
            session.bye()
477
 
            return
478
 
        # Have to check if client.still_valid(), since it is possible
479
 
        # that the client timed out while establishing the GnuTLS
480
 
        # session.
481
 
        if not client.still_valid():
482
 
            logger.warning(u"Client %(name)s is invalid",
483
 
                           vars(client))
484
 
            session.bye()
485
 
            return
486
 
        sent_size = 0
487
 
        while sent_size < len(client.secret):
488
 
            sent = session.send(client.secret[sent_size:])
489
 
            logger.debug(u"Sent: %d, remaining: %d",
490
 
                         sent, len(client.secret)
491
 
                         - (sent_size + sent))
492
 
            sent_size += sent
493
 
        session.bye()
494
 
 
495
 
 
496
 
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
497
 
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
 
2246
        with contextlib.closing(self.server.child_pipe) as child_pipe:
 
2247
            logger.info("TCP connection from: %s",
 
2248
                        str(self.client_address))
 
2249
            logger.debug("Pipe FD: %d",
 
2250
                         self.server.child_pipe.fileno())
 
2251
 
 
2252
            session = gnutls.ClientSession(self.request)
 
2253
 
 
2254
            # priority = ':'.join(("NONE", "+VERS-TLS1.1",
 
2255
            #                       "+AES-256-CBC", "+SHA1",
 
2256
            #                       "+COMP-NULL", "+CTYPE-OPENPGP",
 
2257
            #                       "+DHE-DSS"))
 
2258
            # Use a fallback default, since this MUST be set.
 
2259
            priority = self.server.gnutls_priority
 
2260
            if priority is None:
 
2261
                priority = "NORMAL"
 
2262
            gnutls.priority_set_direct(session._c_object,
 
2263
                                       priority.encode("utf-8"),
 
2264
                                       None)
 
2265
 
 
2266
            # Start communication using the Mandos protocol
 
2267
            # Get protocol number
 
2268
            line = self.request.makefile().readline()
 
2269
            logger.debug("Protocol version: %r", line)
 
2270
            try:
 
2271
                if int(line.strip().split()[0]) > 1:
 
2272
                    raise RuntimeError(line)
 
2273
            except (ValueError, IndexError, RuntimeError) as error:
 
2274
                logger.error("Unknown protocol version: %s", error)
 
2275
                return
 
2276
 
 
2277
            # Start GnuTLS connection
 
2278
            try:
 
2279
                session.handshake()
 
2280
            except gnutls.Error as error:
 
2281
                logger.warning("Handshake failed: %s", error)
 
2282
                # Do not run session.bye() here: the session is not
 
2283
                # established.  Just abandon the request.
 
2284
                return
 
2285
            logger.debug("Handshake succeeded")
 
2286
 
 
2287
            approval_required = False
 
2288
            try:
 
2289
                if gnutls.has_rawpk:
 
2290
                    fpr = ""
 
2291
                    try:
 
2292
                        key_id = self.key_id(
 
2293
                            self.peer_certificate(session))
 
2294
                    except (TypeError, gnutls.Error) as error:
 
2295
                        logger.warning("Bad certificate: %s", error)
 
2296
                        return
 
2297
                    logger.debug("Key ID: %s", key_id)
 
2298
 
 
2299
                else:
 
2300
                    key_id = ""
 
2301
                    try:
 
2302
                        fpr = self.fingerprint(
 
2303
                            self.peer_certificate(session))
 
2304
                    except (TypeError, gnutls.Error) as error:
 
2305
                        logger.warning("Bad certificate: %s", error)
 
2306
                        return
 
2307
                    logger.debug("Fingerprint: %s", fpr)
 
2308
 
 
2309
                try:
 
2310
                    client = ProxyClient(child_pipe, key_id, fpr,
 
2311
                                         self.client_address)
 
2312
                except KeyError:
 
2313
                    return
 
2314
 
 
2315
                if client.approval_delay:
 
2316
                    delay = client.approval_delay
 
2317
                    client.approvals_pending += 1
 
2318
                    approval_required = True
 
2319
 
 
2320
                while True:
 
2321
                    if not client.enabled:
 
2322
                        logger.info("Client %s is disabled",
 
2323
                                    client.name)
 
2324
                        if self.server.use_dbus:
 
2325
                            # Emit D-Bus signal
 
2326
                            client.Rejected("Disabled")
 
2327
                        return
 
2328
 
 
2329
                    if client.approved or not client.approval_delay:
 
2330
                        # We are approved or approval is disabled
 
2331
                        break
 
2332
                    elif client.approved is None:
 
2333
                        logger.info("Client %s needs approval",
 
2334
                                    client.name)
 
2335
                        if self.server.use_dbus:
 
2336
                            # Emit D-Bus signal
 
2337
                            client.NeedApproval(
 
2338
                                client.approval_delay.total_seconds()
 
2339
                                * 1000, client.approved_by_default)
 
2340
                    else:
 
2341
                        logger.warning("Client %s was not approved",
 
2342
                                       client.name)
 
2343
                        if self.server.use_dbus:
 
2344
                            # Emit D-Bus signal
 
2345
                            client.Rejected("Denied")
 
2346
                        return
 
2347
 
 
2348
                    # wait until timeout or approved
 
2349
                    time = datetime.datetime.now()
 
2350
                    client.changedstate.acquire()
 
2351
                    client.changedstate.wait(delay.total_seconds())
 
2352
                    client.changedstate.release()
 
2353
                    time2 = datetime.datetime.now()
 
2354
                    if (time2 - time) >= delay:
 
2355
                        if not client.approved_by_default:
 
2356
                            logger.warning("Client %s timed out while"
 
2357
                                           " waiting for approval",
 
2358
                                           client.name)
 
2359
                            if self.server.use_dbus:
 
2360
                                # Emit D-Bus signal
 
2361
                                client.Rejected("Approval timed out")
 
2362
                            return
 
2363
                        else:
 
2364
                            break
 
2365
                    else:
 
2366
                        delay -= time2 - time
 
2367
 
 
2368
                try:
 
2369
                    session.send(client.secret)
 
2370
                except gnutls.Error as error:
 
2371
                    logger.warning("gnutls send failed",
 
2372
                                   exc_info=error)
 
2373
                    return
 
2374
 
 
2375
                logger.info("Sending secret to %s", client.name)
 
2376
                # bump the timeout using extended_timeout
 
2377
                client.bump_timeout(client.extended_timeout)
 
2378
                if self.server.use_dbus:
 
2379
                    # Emit D-Bus signal
 
2380
                    client.GotSecret()
 
2381
 
 
2382
            finally:
 
2383
                if approval_required:
 
2384
                    client.approvals_pending -= 1
 
2385
                try:
 
2386
                    session.bye()
 
2387
                except gnutls.Error as error:
 
2388
                    logger.warning("GnuTLS bye failed",
 
2389
                                   exc_info=error)
 
2390
 
 
2391
    @staticmethod
 
2392
    def peer_certificate(session):
 
2393
        "Return the peer's certificate as a bytestring"
 
2394
        try:
 
2395
            cert_type = gnutls.certificate_type_get2(session._c_object,
 
2396
                                                     gnutls.CTYPE_PEERS)
 
2397
        except AttributeError:
 
2398
            cert_type = gnutls.certificate_type_get(session._c_object)
 
2399
        if gnutls.has_rawpk:
 
2400
            valid_cert_types = frozenset((gnutls.CRT_RAWPK,))
 
2401
        else:
 
2402
            valid_cert_types = frozenset((gnutls.CRT_OPENPGP,))
 
2403
        # If not a valid certificate type...
 
2404
        if cert_type not in valid_cert_types:
 
2405
            logger.info("Cert type %r not in %r", cert_type,
 
2406
                        valid_cert_types)
 
2407
            # ...return invalid data
 
2408
            return b""
 
2409
        list_size = ctypes.c_uint(1)
 
2410
        cert_list = (gnutls.certificate_get_peers
 
2411
                     (session._c_object, ctypes.byref(list_size)))
 
2412
        if not bool(cert_list) and list_size.value != 0:
 
2413
            raise gnutls.Error("error getting peer certificate")
 
2414
        if list_size.value == 0:
 
2415
            return None
 
2416
        cert = cert_list[0]
 
2417
        return ctypes.string_at(cert.data, cert.size)
 
2418
 
 
2419
    @staticmethod
 
2420
    def key_id(certificate):
 
2421
        "Convert a certificate bytestring to a hexdigit key ID"
 
2422
        # New GnuTLS "datum" with the public key
 
2423
        datum = gnutls.datum_t(
 
2424
            ctypes.cast(ctypes.c_char_p(certificate),
 
2425
                        ctypes.POINTER(ctypes.c_ubyte)),
 
2426
            ctypes.c_uint(len(certificate)))
 
2427
        # XXX all these need to be created in the gnutls "module"
 
2428
        # New empty GnuTLS certificate
 
2429
        pubkey = gnutls.pubkey_t()
 
2430
        gnutls.pubkey_init(ctypes.byref(pubkey))
 
2431
        # Import the raw public key into the certificate
 
2432
        gnutls.pubkey_import(pubkey,
 
2433
                             ctypes.byref(datum),
 
2434
                             gnutls.X509_FMT_DER)
 
2435
        # New buffer for the key ID
 
2436
        buf = ctypes.create_string_buffer(32)
 
2437
        buf_len = ctypes.c_size_t(len(buf))
 
2438
        # Get the key ID from the raw public key into the buffer
 
2439
        gnutls.pubkey_get_key_id(pubkey,
 
2440
                                 gnutls.KEYID_USE_SHA256,
 
2441
                                 ctypes.cast(ctypes.byref(buf),
 
2442
                                             ctypes.POINTER(ctypes.c_ubyte)),
 
2443
                                 ctypes.byref(buf_len))
 
2444
        # Deinit the certificate
 
2445
        gnutls.pubkey_deinit(pubkey)
 
2446
 
 
2447
        # Convert the buffer to a Python bytestring
 
2448
        key_id = ctypes.string_at(buf, buf_len.value)
 
2449
        # Convert the bytestring to hexadecimal notation
 
2450
        hex_key_id = binascii.hexlify(key_id).upper()
 
2451
        return hex_key_id
 
2452
 
 
2453
    @staticmethod
 
2454
    def fingerprint(openpgp):
 
2455
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
 
2456
        # New GnuTLS "datum" with the OpenPGP public key
 
2457
        datum = gnutls.datum_t(
 
2458
            ctypes.cast(ctypes.c_char_p(openpgp),
 
2459
                        ctypes.POINTER(ctypes.c_ubyte)),
 
2460
            ctypes.c_uint(len(openpgp)))
 
2461
        # New empty GnuTLS certificate
 
2462
        crt = gnutls.openpgp_crt_t()
 
2463
        gnutls.openpgp_crt_init(ctypes.byref(crt))
 
2464
        # Import the OpenPGP public key into the certificate
 
2465
        gnutls.openpgp_crt_import(crt, ctypes.byref(datum),
 
2466
                                  gnutls.OPENPGP_FMT_RAW)
 
2467
        # Verify the self signature in the key
 
2468
        crtverify = ctypes.c_uint()
 
2469
        gnutls.openpgp_crt_verify_self(crt, 0,
 
2470
                                       ctypes.byref(crtverify))
 
2471
        if crtverify.value != 0:
 
2472
            gnutls.openpgp_crt_deinit(crt)
 
2473
            raise gnutls.CertificateSecurityError(code
 
2474
                                                  =crtverify.value)
 
2475
        # New buffer for the fingerprint
 
2476
        buf = ctypes.create_string_buffer(20)
 
2477
        buf_len = ctypes.c_size_t()
 
2478
        # Get the fingerprint from the certificate into the buffer
 
2479
        gnutls.openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
 
2480
                                           ctypes.byref(buf_len))
 
2481
        # Deinit the certificate
 
2482
        gnutls.openpgp_crt_deinit(crt)
 
2483
        # Convert the buffer to a Python bytestring
 
2484
        fpr = ctypes.string_at(buf, buf_len.value)
 
2485
        # Convert the bytestring to hexadecimal notation
 
2486
        hex_fpr = binascii.hexlify(fpr).upper()
 
2487
        return hex_fpr
 
2488
 
 
2489
 
 
2490
class MultiprocessingMixIn(object):
 
2491
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
 
2492
 
 
2493
    def sub_process_main(self, request, address):
 
2494
        try:
 
2495
            self.finish_request(request, address)
 
2496
        except Exception:
 
2497
            self.handle_error(request, address)
 
2498
        self.close_request(request)
 
2499
 
 
2500
    def process_request(self, request, address):
 
2501
        """Start a new process to process the request."""
 
2502
        proc = multiprocessing.Process(target=self.sub_process_main,
 
2503
                                       args=(request, address))
 
2504
        proc.start()
 
2505
        return proc
 
2506
 
 
2507
 
 
2508
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
 
2509
    """ adds a pipe to the MixIn """
 
2510
 
 
2511
    def process_request(self, request, client_address):
 
2512
        """Overrides and wraps the original process_request().
 
2513
 
 
2514
        This function creates a new pipe in self.pipe
 
2515
        """
 
2516
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
 
2517
 
 
2518
        proc = MultiprocessingMixIn.process_request(self, request,
 
2519
                                                    client_address)
 
2520
        self.child_pipe.close()
 
2521
        self.add_pipe(parent_pipe, proc)
 
2522
 
 
2523
    def add_pipe(self, parent_pipe, proc):
 
2524
        """Dummy function; override as necessary"""
 
2525
        raise NotImplementedError()
 
2526
 
 
2527
 
 
2528
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
 
2529
                     socketserver.TCPServer, object):
 
2530
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
 
2531
 
498
2532
    Attributes:
499
 
        settings:       Server settings
500
 
        clients:        Set() of Client objects
 
2533
        enabled:        Boolean; whether this server is activated yet
 
2534
        interface:      None or a network interface name (string)
 
2535
        use_ipv6:       Boolean; to use IPv6 or not
501
2536
    """
502
 
    address_family = socket.AF_INET6
503
 
    def __init__(self, *args, **kwargs):
504
 
        if "settings" in kwargs:
505
 
            self.settings = kwargs["settings"]
506
 
            del kwargs["settings"]
507
 
        if "clients" in kwargs:
508
 
            self.clients = kwargs["clients"]
509
 
            del kwargs["clients"]
510
 
        return super(type(self), self).__init__(*args, **kwargs)
 
2537
 
 
2538
    def __init__(self, server_address, RequestHandlerClass,
 
2539
                 interface=None,
 
2540
                 use_ipv6=True,
 
2541
                 socketfd=None):
 
2542
        """If socketfd is set, use that file descriptor instead of
 
2543
        creating a new one with socket.socket().
 
2544
        """
 
2545
        self.interface = interface
 
2546
        if use_ipv6:
 
2547
            self.address_family = socket.AF_INET6
 
2548
        if socketfd is not None:
 
2549
            # Save the file descriptor
 
2550
            self.socketfd = socketfd
 
2551
            # Save the original socket.socket() function
 
2552
            self.socket_socket = socket.socket
 
2553
 
 
2554
            # To implement --socket, we monkey patch socket.socket.
 
2555
            #
 
2556
            # (When socketserver.TCPServer is a new-style class, we
 
2557
            # could make self.socket into a property instead of monkey
 
2558
            # patching socket.socket.)
 
2559
            #
 
2560
            # Create a one-time-only replacement for socket.socket()
 
2561
            @functools.wraps(socket.socket)
 
2562
            def socket_wrapper(*args, **kwargs):
 
2563
                # Restore original function so subsequent calls are
 
2564
                # not affected.
 
2565
                socket.socket = self.socket_socket
 
2566
                del self.socket_socket
 
2567
                # This time only, return a new socket object from the
 
2568
                # saved file descriptor.
 
2569
                return socket.fromfd(self.socketfd, *args, **kwargs)
 
2570
            # Replace socket.socket() function with wrapper
 
2571
            socket.socket = socket_wrapper
 
2572
        # The socketserver.TCPServer.__init__ will call
 
2573
        # socket.socket(), which might be our replacement,
 
2574
        # socket_wrapper(), if socketfd was set.
 
2575
        socketserver.TCPServer.__init__(self, server_address,
 
2576
                                        RequestHandlerClass)
 
2577
 
511
2578
    def server_bind(self):
512
2579
        """This overrides the normal server_bind() function
513
2580
        to bind to an interface if one was specified, and also NOT to
514
2581
        bind to an address or port if they were not specified."""
515
 
        if self.settings["interface"]:
516
 
            # 25 is from /usr/include/asm-i486/socket.h
517
 
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
 
2582
        global SO_BINDTODEVICE
 
2583
        if self.interface is not None:
 
2584
            if SO_BINDTODEVICE is None:
 
2585
                # Fall back to a hard-coded value which seems to be
 
2586
                # common enough.
 
2587
                logger.warning("SO_BINDTODEVICE not found, trying 25")
 
2588
                SO_BINDTODEVICE = 25
518
2589
            try:
519
 
                self.socket.setsockopt(socket.SOL_SOCKET,
520
 
                                       SO_BINDTODEVICE,
521
 
                                       self.settings["interface"])
522
 
            except socket.error, error:
523
 
                if error[0] == errno.EPERM:
524
 
                    logger.error(u"No permission to"
525
 
                                 u" bind to interface %s",
526
 
                                 self.settings["interface"])
 
2590
                self.socket.setsockopt(
 
2591
                    socket.SOL_SOCKET, SO_BINDTODEVICE,
 
2592
                    (self.interface + "\0").encode("utf-8"))
 
2593
            except socket.error as error:
 
2594
                if error.errno == errno.EPERM:
 
2595
                    logger.error("No permission to bind to"
 
2596
                                 " interface %s", self.interface)
 
2597
                elif error.errno == errno.ENOPROTOOPT:
 
2598
                    logger.error("SO_BINDTODEVICE not available;"
 
2599
                                 " cannot bind to interface %s",
 
2600
                                 self.interface)
 
2601
                elif error.errno == errno.ENODEV:
 
2602
                    logger.error("Interface %s does not exist,"
 
2603
                                 " cannot bind", self.interface)
527
2604
                else:
528
 
                    raise error
 
2605
                    raise
529
2606
        # Only bind(2) the socket if we really need to.
530
2607
        if self.server_address[0] or self.server_address[1]:
 
2608
            if self.server_address[1]:
 
2609
                self.allow_reuse_address = True
531
2610
            if not self.server_address[0]:
532
 
                in6addr_any = "::"
533
 
                self.server_address = (in6addr_any,
 
2611
                if self.address_family == socket.AF_INET6:
 
2612
                    any_address = "::"  # in6addr_any
 
2613
                else:
 
2614
                    any_address = "0.0.0.0"  # INADDR_ANY
 
2615
                self.server_address = (any_address,
534
2616
                                       self.server_address[1])
535
2617
            elif not self.server_address[1]:
536
 
                self.server_address = (self.server_address[0],
537
 
                                       0)
538
 
#                 if self.settings["interface"]:
 
2618
                self.server_address = (self.server_address[0], 0)
 
2619
#                 if self.interface:
539
2620
#                     self.server_address = (self.server_address[0],
540
2621
#                                            0, # port
541
2622
#                                            0, # flowinfo
542
2623
#                                            if_nametoindex
543
 
#                                            (self.settings
544
 
#                                             ["interface"]))
545
 
            return super(type(self), self).server_bind()
 
2624
#                                            (self.interface))
 
2625
            return socketserver.TCPServer.server_bind(self)
 
2626
 
 
2627
 
 
2628
class MandosServer(IPv6_TCPServer):
 
2629
    """Mandos server.
 
2630
 
 
2631
    Attributes:
 
2632
        clients:        set of Client objects
 
2633
        gnutls_priority GnuTLS priority string
 
2634
        use_dbus:       Boolean; to emit D-Bus signals or not
 
2635
 
 
2636
    Assumes a GLib.MainLoop event loop.
 
2637
    """
 
2638
 
 
2639
    def __init__(self, server_address, RequestHandlerClass,
 
2640
                 interface=None,
 
2641
                 use_ipv6=True,
 
2642
                 clients=None,
 
2643
                 gnutls_priority=None,
 
2644
                 use_dbus=True,
 
2645
                 socketfd=None):
 
2646
        self.enabled = False
 
2647
        self.clients = clients
 
2648
        if self.clients is None:
 
2649
            self.clients = {}
 
2650
        self.use_dbus = use_dbus
 
2651
        self.gnutls_priority = gnutls_priority
 
2652
        IPv6_TCPServer.__init__(self, server_address,
 
2653
                                RequestHandlerClass,
 
2654
                                interface=interface,
 
2655
                                use_ipv6=use_ipv6,
 
2656
                                socketfd=socketfd)
 
2657
 
 
2658
    def server_activate(self):
 
2659
        if self.enabled:
 
2660
            return socketserver.TCPServer.server_activate(self)
 
2661
 
 
2662
    def enable(self):
 
2663
        self.enabled = True
 
2664
 
 
2665
    def add_pipe(self, parent_pipe, proc):
 
2666
        # Call "handle_ipc" for both data and EOF events
 
2667
        GLib.io_add_watch(
 
2668
            parent_pipe.fileno(),
 
2669
            GLib.IO_IN | GLib.IO_HUP,
 
2670
            functools.partial(self.handle_ipc,
 
2671
                              parent_pipe=parent_pipe,
 
2672
                              proc=proc))
 
2673
 
 
2674
    def handle_ipc(self, source, condition,
 
2675
                   parent_pipe=None,
 
2676
                   proc=None,
 
2677
                   client_object=None):
 
2678
        # error, or the other end of multiprocessing.Pipe has closed
 
2679
        if condition & (GLib.IO_ERR | GLib.IO_HUP):
 
2680
            # Wait for other process to exit
 
2681
            proc.join()
 
2682
            return False
 
2683
 
 
2684
        # Read a request from the child
 
2685
        request = parent_pipe.recv()
 
2686
        command = request[0]
 
2687
 
 
2688
        if command == 'init':
 
2689
            key_id = request[1].decode("ascii")
 
2690
            fpr = request[2].decode("ascii")
 
2691
            address = request[3]
 
2692
 
 
2693
            for c in self.clients.values():
 
2694
                if key_id == "E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855":
 
2695
                    continue
 
2696
                if key_id and c.key_id == key_id:
 
2697
                    client = c
 
2698
                    break
 
2699
                if fpr and c.fingerprint == fpr:
 
2700
                    client = c
 
2701
                    break
 
2702
            else:
 
2703
                logger.info("Client not found for key ID: %s, address"
 
2704
                            ": %s", key_id or fpr, address)
 
2705
                if self.use_dbus:
 
2706
                    # Emit D-Bus signal
 
2707
                    mandos_dbus_service.ClientNotFound(key_id or fpr,
 
2708
                                                       address[0])
 
2709
                parent_pipe.send(False)
 
2710
                return False
 
2711
 
 
2712
            GLib.io_add_watch(
 
2713
                parent_pipe.fileno(),
 
2714
                GLib.IO_IN | GLib.IO_HUP,
 
2715
                functools.partial(self.handle_ipc,
 
2716
                                  parent_pipe=parent_pipe,
 
2717
                                  proc=proc,
 
2718
                                  client_object=client))
 
2719
            parent_pipe.send(True)
 
2720
            # remove the old hook in favor of the new above hook on
 
2721
            # same fileno
 
2722
            return False
 
2723
        if command == 'funcall':
 
2724
            funcname = request[1]
 
2725
            args = request[2]
 
2726
            kwargs = request[3]
 
2727
 
 
2728
            parent_pipe.send(('data', getattr(client_object,
 
2729
                                              funcname)(*args,
 
2730
                                                        **kwargs)))
 
2731
 
 
2732
        if command == 'getattr':
 
2733
            attrname = request[1]
 
2734
            if isinstance(client_object.__getattribute__(attrname),
 
2735
                          collections.Callable):
 
2736
                parent_pipe.send(('function', ))
 
2737
            else:
 
2738
                parent_pipe.send((
 
2739
                    'data', client_object.__getattribute__(attrname)))
 
2740
 
 
2741
        if command == 'setattr':
 
2742
            attrname = request[1]
 
2743
            value = request[2]
 
2744
            setattr(client_object, attrname, value)
 
2745
 
 
2746
        return True
 
2747
 
 
2748
 
 
2749
def rfc3339_duration_to_delta(duration):
 
2750
    """Parse an RFC 3339 "duration" and return a datetime.timedelta
 
2751
 
 
2752
    >>> rfc3339_duration_to_delta("P7D")
 
2753
    datetime.timedelta(7)
 
2754
    >>> rfc3339_duration_to_delta("PT60S")
 
2755
    datetime.timedelta(0, 60)
 
2756
    >>> rfc3339_duration_to_delta("PT60M")
 
2757
    datetime.timedelta(0, 3600)
 
2758
    >>> rfc3339_duration_to_delta("PT24H")
 
2759
    datetime.timedelta(1)
 
2760
    >>> rfc3339_duration_to_delta("P1W")
 
2761
    datetime.timedelta(7)
 
2762
    >>> rfc3339_duration_to_delta("PT5M30S")
 
2763
    datetime.timedelta(0, 330)
 
2764
    >>> rfc3339_duration_to_delta("P1DT3M20S")
 
2765
    datetime.timedelta(1, 200)
 
2766
    """
 
2767
 
 
2768
    # Parsing an RFC 3339 duration with regular expressions is not
 
2769
    # possible - there would have to be multiple places for the same
 
2770
    # values, like seconds.  The current code, while more esoteric, is
 
2771
    # cleaner without depending on a parsing library.  If Python had a
 
2772
    # built-in library for parsing we would use it, but we'd like to
 
2773
    # avoid excessive use of external libraries.
 
2774
 
 
2775
    # New type for defining tokens, syntax, and semantics all-in-one
 
2776
    Token = collections.namedtuple("Token", (
 
2777
        "regexp",  # To match token; if "value" is not None, must have
 
2778
                   # a "group" containing digits
 
2779
        "value",   # datetime.timedelta or None
 
2780
        "followers"))           # Tokens valid after this token
 
2781
    # RFC 3339 "duration" tokens, syntax, and semantics; taken from
 
2782
    # the "duration" ABNF definition in RFC 3339, Appendix A.
 
2783
    token_end = Token(re.compile(r"$"), None, frozenset())
 
2784
    token_second = Token(re.compile(r"(\d+)S"),
 
2785
                         datetime.timedelta(seconds=1),
 
2786
                         frozenset((token_end, )))
 
2787
    token_minute = Token(re.compile(r"(\d+)M"),
 
2788
                         datetime.timedelta(minutes=1),
 
2789
                         frozenset((token_second, token_end)))
 
2790
    token_hour = Token(re.compile(r"(\d+)H"),
 
2791
                       datetime.timedelta(hours=1),
 
2792
                       frozenset((token_minute, token_end)))
 
2793
    token_time = Token(re.compile(r"T"),
 
2794
                       None,
 
2795
                       frozenset((token_hour, token_minute,
 
2796
                                  token_second)))
 
2797
    token_day = Token(re.compile(r"(\d+)D"),
 
2798
                      datetime.timedelta(days=1),
 
2799
                      frozenset((token_time, token_end)))
 
2800
    token_month = Token(re.compile(r"(\d+)M"),
 
2801
                        datetime.timedelta(weeks=4),
 
2802
                        frozenset((token_day, token_end)))
 
2803
    token_year = Token(re.compile(r"(\d+)Y"),
 
2804
                       datetime.timedelta(weeks=52),
 
2805
                       frozenset((token_month, token_end)))
 
2806
    token_week = Token(re.compile(r"(\d+)W"),
 
2807
                       datetime.timedelta(weeks=1),
 
2808
                       frozenset((token_end, )))
 
2809
    token_duration = Token(re.compile(r"P"), None,
 
2810
                           frozenset((token_year, token_month,
 
2811
                                      token_day, token_time,
 
2812
                                      token_week)))
 
2813
    # Define starting values:
 
2814
    # Value so far
 
2815
    value = datetime.timedelta()
 
2816
    found_token = None
 
2817
    # Following valid tokens
 
2818
    followers = frozenset((token_duration, ))
 
2819
    # String left to parse
 
2820
    s = duration
 
2821
    # Loop until end token is found
 
2822
    while found_token is not token_end:
 
2823
        # Search for any currently valid tokens
 
2824
        for token in followers:
 
2825
            match = token.regexp.match(s)
 
2826
            if match is not None:
 
2827
                # Token found
 
2828
                if token.value is not None:
 
2829
                    # Value found, parse digits
 
2830
                    factor = int(match.group(1), 10)
 
2831
                    # Add to value so far
 
2832
                    value += factor * token.value
 
2833
                # Strip token from string
 
2834
                s = token.regexp.sub("", s, 1)
 
2835
                # Go to found token
 
2836
                found_token = token
 
2837
                # Set valid next tokens
 
2838
                followers = found_token.followers
 
2839
                break
 
2840
        else:
 
2841
            # No currently valid tokens were found
 
2842
            raise ValueError("Invalid RFC 3339 duration: {!r}"
 
2843
                             .format(duration))
 
2844
    # End token found
 
2845
    return value
546
2846
 
547
2847
 
548
2848
def string_to_delta(interval):
556
2856
    datetime.timedelta(0, 3600)
557
2857
    >>> string_to_delta('24h')
558
2858
    datetime.timedelta(1)
559
 
    >>> string_to_delta(u'1w')
 
2859
    >>> string_to_delta('1w')
560
2860
    datetime.timedelta(7)
 
2861
    >>> string_to_delta('5m 30s')
 
2862
    datetime.timedelta(0, 330)
561
2863
    """
562
 
    try:
563
 
        suffix=unicode(interval[-1])
564
 
        value=int(interval[:-1])
565
 
        if suffix == u"d":
566
 
            delta = datetime.timedelta(value)
567
 
        elif suffix == u"s":
568
 
            delta = datetime.timedelta(0, value)
569
 
        elif suffix == u"m":
570
 
            delta = datetime.timedelta(0, 0, 0, 0, value)
571
 
        elif suffix == u"h":
572
 
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
573
 
        elif suffix == u"w":
574
 
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
575
 
        else:
576
 
            raise ValueError
577
 
    except (ValueError, IndexError):
578
 
        raise ValueError
579
 
    return delta
580
 
 
581
 
 
582
 
def server_state_changed(state):
583
 
    """Derived from the Avahi example code"""
584
 
    if state == avahi.SERVER_COLLISION:
585
 
        logger.error(u"Server name collision")
586
 
        service.remove()
587
 
    elif state == avahi.SERVER_RUNNING:
588
 
        service.add()
589
 
 
590
 
 
591
 
def entry_group_state_changed(state, error):
592
 
    """Derived from the Avahi example code"""
593
 
    logger.debug(u"state change: %i", state)
594
 
    
595
 
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
596
 
        logger.debug(u"Service established.")
597
 
    elif state == avahi.ENTRY_GROUP_COLLISION:
598
 
        logger.warning(u"Service name collision.")
599
 
        service.rename()
600
 
    elif state == avahi.ENTRY_GROUP_FAILURE:
601
 
        logger.critical(u"Error in group state changed %s",
602
 
                        unicode(error))
603
 
        raise AvahiGroupError("State changed: %s", str(error))
604
 
 
605
 
def if_nametoindex(interface):
606
 
    """Call the C function if_nametoindex(), or equivalent"""
607
 
    global if_nametoindex
608
 
    try:
609
 
        if "ctypes.util" not in sys.modules:
610
 
            import ctypes.util
611
 
        if_nametoindex = ctypes.cdll.LoadLibrary\
612
 
            (ctypes.util.find_library("c")).if_nametoindex
613
 
    except (OSError, AttributeError):
614
 
        if "struct" not in sys.modules:
615
 
            import struct
616
 
        if "fcntl" not in sys.modules:
617
 
            import fcntl
618
 
        def if_nametoindex(interface):
619
 
            "Get an interface index the hard way, i.e. using fcntl()"
620
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
621
 
            s = socket.socket()
622
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
623
 
                                struct.pack("16s16x", interface))
624
 
            s.close()
625
 
            interface_index = struct.unpack("I", ifreq[16:20])[0]
626
 
            return interface_index
627
 
    return if_nametoindex(interface)
628
 
 
629
 
 
630
 
def daemon(nochdir = False, noclose = False):
 
2864
 
 
2865
    try:
 
2866
        return rfc3339_duration_to_delta(interval)
 
2867
    except ValueError:
 
2868
        pass
 
2869
 
 
2870
    timevalue = datetime.timedelta(0)
 
2871
    for s in interval.split():
 
2872
        try:
 
2873
            suffix = s[-1]
 
2874
            value = int(s[:-1])
 
2875
            if suffix == "d":
 
2876
                delta = datetime.timedelta(value)
 
2877
            elif suffix == "s":
 
2878
                delta = datetime.timedelta(0, value)
 
2879
            elif suffix == "m":
 
2880
                delta = datetime.timedelta(0, 0, 0, 0, value)
 
2881
            elif suffix == "h":
 
2882
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
2883
            elif suffix == "w":
 
2884
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
2885
            else:
 
2886
                raise ValueError("Unknown suffix {!r}".format(suffix))
 
2887
        except IndexError as e:
 
2888
            raise ValueError(*(e.args))
 
2889
        timevalue += delta
 
2890
    return timevalue
 
2891
 
 
2892
 
 
2893
def daemon(nochdir=False, noclose=False):
631
2894
    """See daemon(3).  Standard BSD Unix function.
 
2895
 
632
2896
    This should really exist as os.daemon, but it doesn't (yet)."""
633
2897
    if os.fork():
634
2898
        sys.exit()
639
2903
        sys.exit()
640
2904
    if not noclose:
641
2905
        # Close all standard open file descriptors
642
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
2906
        null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
643
2907
        if not stat.S_ISCHR(os.fstat(null).st_mode):
644
2908
            raise OSError(errno.ENODEV,
645
 
                          "/dev/null not a character device")
 
2909
                          "{} not a character device"
 
2910
                          .format(os.devnull))
646
2911
        os.dup2(null, sys.stdin.fileno())
647
2912
        os.dup2(null, sys.stdout.fileno())
648
2913
        os.dup2(null, sys.stderr.fileno())
651
2916
 
652
2917
 
653
2918
def main():
654
 
    global main_loop_started
655
 
    main_loop_started = False
656
 
    
657
 
    parser = OptionParser(version = "Mandos server %s" % version)
658
 
    parser.add_option("-i", "--interface", type="string",
659
 
                      metavar="IF", help="Bind to interface IF")
660
 
    parser.add_option("-a", "--address", type="string",
661
 
                      help="Address to listen for requests on")
662
 
    parser.add_option("-p", "--port", type="int",
663
 
                      help="Port number to receive requests on")
664
 
    parser.add_option("--check", action="store_true", default=False,
665
 
                      help="Run self-test")
666
 
    parser.add_option("--debug", action="store_true",
667
 
                      help="Debug mode; run in foreground and log to"
668
 
                      " terminal")
669
 
    parser.add_option("--priority", type="string", help="GnuTLS"
670
 
                      " priority string (see GnuTLS documentation)")
671
 
    parser.add_option("--servicename", type="string", metavar="NAME",
672
 
                      help="Zeroconf service name")
673
 
    parser.add_option("--configdir", type="string",
674
 
                      default="/etc/mandos", metavar="DIR",
675
 
                      help="Directory to search for configuration"
676
 
                      " files")
677
 
    (options, args) = parser.parse_args()
678
 
    
 
2919
 
 
2920
    ##################################################################
 
2921
    # Parsing of options, both command line and config file
 
2922
 
 
2923
    parser = argparse.ArgumentParser()
 
2924
    parser.add_argument("-v", "--version", action="version",
 
2925
                        version="%(prog)s {}".format(version),
 
2926
                        help="show version number and exit")
 
2927
    parser.add_argument("-i", "--interface", metavar="IF",
 
2928
                        help="Bind to interface IF")
 
2929
    parser.add_argument("-a", "--address",
 
2930
                        help="Address to listen for requests on")
 
2931
    parser.add_argument("-p", "--port", type=int,
 
2932
                        help="Port number to receive requests on")
 
2933
    parser.add_argument("--check", action="store_true",
 
2934
                        help="Run self-test")
 
2935
    parser.add_argument("--debug", action="store_true",
 
2936
                        help="Debug mode; run in foreground and log"
 
2937
                        " to terminal", default=None)
 
2938
    parser.add_argument("--debuglevel", metavar="LEVEL",
 
2939
                        help="Debug level for stdout output")
 
2940
    parser.add_argument("--priority", help="GnuTLS"
 
2941
                        " priority string (see GnuTLS documentation)")
 
2942
    parser.add_argument("--servicename",
 
2943
                        metavar="NAME", help="Zeroconf service name")
 
2944
    parser.add_argument("--configdir",
 
2945
                        default="/etc/mandos", metavar="DIR",
 
2946
                        help="Directory to search for configuration"
 
2947
                        " files")
 
2948
    parser.add_argument("--no-dbus", action="store_false",
 
2949
                        dest="use_dbus", help="Do not provide D-Bus"
 
2950
                        " system bus interface", default=None)
 
2951
    parser.add_argument("--no-ipv6", action="store_false",
 
2952
                        dest="use_ipv6", help="Do not use IPv6",
 
2953
                        default=None)
 
2954
    parser.add_argument("--no-restore", action="store_false",
 
2955
                        dest="restore", help="Do not restore stored"
 
2956
                        " state", default=None)
 
2957
    parser.add_argument("--socket", type=int,
 
2958
                        help="Specify a file descriptor to a network"
 
2959
                        " socket to use instead of creating one")
 
2960
    parser.add_argument("--statedir", metavar="DIR",
 
2961
                        help="Directory to save/restore state in")
 
2962
    parser.add_argument("--foreground", action="store_true",
 
2963
                        help="Run in foreground", default=None)
 
2964
    parser.add_argument("--no-zeroconf", action="store_false",
 
2965
                        dest="zeroconf", help="Do not use Zeroconf",
 
2966
                        default=None)
 
2967
 
 
2968
    options = parser.parse_args()
 
2969
 
679
2970
    if options.check:
680
2971
        import doctest
681
 
        doctest.testmod()
682
 
        sys.exit()
683
 
    
 
2972
        fail_count, test_count = doctest.testmod()
 
2973
        sys.exit(os.EX_OK if fail_count == 0 else 1)
 
2974
 
684
2975
    # Default values for config file for server-global settings
685
 
    server_defaults = { "interface": "",
686
 
                        "address": "",
687
 
                        "port": "",
688
 
                        "debug": "False",
689
 
                        "priority":
690
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
691
 
                        "servicename": "Mandos",
692
 
                        }
693
 
    
 
2976
    if gnutls.has_rawpk:
 
2977
        priority = ("SECURE128:!CTYPE-X.509:+CTYPE-RAWPK:!RSA"
 
2978
                    ":!VERS-ALL:+VERS-TLS1.3:%PROFILE_ULTRA")
 
2979
    else:
 
2980
        priority = ("SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:!RSA"
 
2981
                    ":+SIGN-DSA-SHA256")
 
2982
    server_defaults = {"interface": "",
 
2983
                       "address": "",
 
2984
                       "port": "",
 
2985
                       "debug": "False",
 
2986
                       "priority": priority,
 
2987
                       "servicename": "Mandos",
 
2988
                       "use_dbus": "True",
 
2989
                       "use_ipv6": "True",
 
2990
                       "debuglevel": "",
 
2991
                       "restore": "True",
 
2992
                       "socket": "",
 
2993
                       "statedir": "/var/lib/mandos",
 
2994
                       "foreground": "False",
 
2995
                       "zeroconf": "True",
 
2996
                       }
 
2997
    del priority
 
2998
 
694
2999
    # Parse config file for server-global settings
695
 
    server_config = ConfigParser.SafeConfigParser(server_defaults)
 
3000
    server_config = configparser.SafeConfigParser(server_defaults)
696
3001
    del server_defaults
697
3002
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
698
 
    server_section = "server"
699
3003
    # Convert the SafeConfigParser object to a dict
700
 
    server_settings = dict(server_config.items(server_section))
701
 
    # Use getboolean on the boolean config option
702
 
    server_settings["debug"] = server_config.getboolean\
703
 
                               (server_section, "debug")
 
3004
    server_settings = server_config.defaults()
 
3005
    # Use the appropriate methods on the non-string config options
 
3006
    for option in ("debug", "use_dbus", "use_ipv6", "restore",
 
3007
                   "foreground", "zeroconf"):
 
3008
        server_settings[option] = server_config.getboolean("DEFAULT",
 
3009
                                                           option)
 
3010
    if server_settings["port"]:
 
3011
        server_settings["port"] = server_config.getint("DEFAULT",
 
3012
                                                       "port")
 
3013
    if server_settings["socket"]:
 
3014
        server_settings["socket"] = server_config.getint("DEFAULT",
 
3015
                                                         "socket")
 
3016
        # Later, stdin will, and stdout and stderr might, be dup'ed
 
3017
        # over with an opened os.devnull.  But we don't want this to
 
3018
        # happen with a supplied network socket.
 
3019
        if 0 <= server_settings["socket"] <= 2:
 
3020
            server_settings["socket"] = os.dup(server_settings
 
3021
                                               ["socket"])
704
3022
    del server_config
705
 
    
 
3023
 
706
3024
    # Override the settings from the config file with command line
707
3025
    # options, if set.
708
3026
    for option in ("interface", "address", "port", "debug",
709
 
                   "priority", "servicename", "configdir"):
 
3027
                   "priority", "servicename", "configdir", "use_dbus",
 
3028
                   "use_ipv6", "debuglevel", "restore", "statedir",
 
3029
                   "socket", "foreground", "zeroconf"):
710
3030
        value = getattr(options, option)
711
3031
        if value is not None:
712
3032
            server_settings[option] = value
713
3033
    del options
 
3034
    # Force all strings to be unicode
 
3035
    for option in server_settings.keys():
 
3036
        if isinstance(server_settings[option], bytes):
 
3037
            server_settings[option] = (server_settings[option]
 
3038
                                       .decode("utf-8"))
 
3039
    # Force all boolean options to be boolean
 
3040
    for option in ("debug", "use_dbus", "use_ipv6", "restore",
 
3041
                   "foreground", "zeroconf"):
 
3042
        server_settings[option] = bool(server_settings[option])
 
3043
    # Debug implies foreground
 
3044
    if server_settings["debug"]:
 
3045
        server_settings["foreground"] = True
714
3046
    # Now we have our good server settings in "server_settings"
715
 
    
 
3047
 
 
3048
    ##################################################################
 
3049
 
 
3050
    if (not server_settings["zeroconf"]
 
3051
        and not (server_settings["port"]
 
3052
                 or server_settings["socket"] != "")):
 
3053
        parser.error("Needs port or socket to work without Zeroconf")
 
3054
 
 
3055
    # For convenience
716
3056
    debug = server_settings["debug"]
717
 
    
718
 
    if not debug:
719
 
        syslogger.setLevel(logging.WARNING)
720
 
    
 
3057
    debuglevel = server_settings["debuglevel"]
 
3058
    use_dbus = server_settings["use_dbus"]
 
3059
    use_ipv6 = server_settings["use_ipv6"]
 
3060
    stored_state_path = os.path.join(server_settings["statedir"],
 
3061
                                     stored_state_file)
 
3062
    foreground = server_settings["foreground"]
 
3063
    zeroconf = server_settings["zeroconf"]
 
3064
 
 
3065
    if debug:
 
3066
        initlogger(debug, logging.DEBUG)
 
3067
    else:
 
3068
        if not debuglevel:
 
3069
            initlogger(debug)
 
3070
        else:
 
3071
            level = getattr(logging, debuglevel.upper())
 
3072
            initlogger(debug, level)
 
3073
 
721
3074
    if server_settings["servicename"] != "Mandos":
722
 
        syslogger.setFormatter(logging.Formatter\
723
 
                               ('Mandos (%s): %%(levelname)s:'
724
 
                                ' %%(message)s'
725
 
                                % server_settings["servicename"]))
726
 
    
 
3075
        syslogger.setFormatter(
 
3076
            logging.Formatter('Mandos ({}) [%(process)d]:'
 
3077
                              ' %(levelname)s: %(message)s'.format(
 
3078
                                  server_settings["servicename"])))
 
3079
 
727
3080
    # Parse config file with clients
728
 
    client_defaults = { "timeout": "1h",
729
 
                        "interval": "5m",
730
 
                        "checker": "fping -q -- %%(host)s",
731
 
                        }
732
 
    client_config = ConfigParser.SafeConfigParser(client_defaults)
 
3081
    client_config = configparser.SafeConfigParser(Client
 
3082
                                                  .client_defaults)
733
3083
    client_config.read(os.path.join(server_settings["configdir"],
734
3084
                                    "clients.conf"))
735
 
    
736
 
    global service
737
 
    service = AvahiService(name = server_settings["servicename"],
738
 
                           type = "_mandos._tcp", );
739
 
    if server_settings["interface"]:
740
 
        service.interface = if_nametoindex(server_settings["interface"])
741
 
    
 
3085
 
 
3086
    global mandos_dbus_service
 
3087
    mandos_dbus_service = None
 
3088
 
 
3089
    socketfd = None
 
3090
    if server_settings["socket"] != "":
 
3091
        socketfd = server_settings["socket"]
 
3092
    tcp_server = MandosServer(
 
3093
        (server_settings["address"], server_settings["port"]),
 
3094
        ClientHandler,
 
3095
        interface=(server_settings["interface"] or None),
 
3096
        use_ipv6=use_ipv6,
 
3097
        gnutls_priority=server_settings["priority"],
 
3098
        use_dbus=use_dbus,
 
3099
        socketfd=socketfd)
 
3100
    if not foreground:
 
3101
        pidfilename = "/run/mandos.pid"
 
3102
        if not os.path.isdir("/run/."):
 
3103
            pidfilename = "/var/run/mandos.pid"
 
3104
        pidfile = None
 
3105
        try:
 
3106
            pidfile = codecs.open(pidfilename, "w", encoding="utf-8")
 
3107
        except IOError as e:
 
3108
            logger.error("Could not open file %r", pidfilename,
 
3109
                         exc_info=e)
 
3110
 
 
3111
    for name, group in (("_mandos", "_mandos"),
 
3112
                        ("mandos", "mandos"),
 
3113
                        ("nobody", "nogroup")):
 
3114
        try:
 
3115
            uid = pwd.getpwnam(name).pw_uid
 
3116
            gid = pwd.getpwnam(group).pw_gid
 
3117
            break
 
3118
        except KeyError:
 
3119
            continue
 
3120
    else:
 
3121
        uid = 65534
 
3122
        gid = 65534
 
3123
    try:
 
3124
        os.setgid(gid)
 
3125
        os.setuid(uid)
 
3126
        if debug:
 
3127
            logger.debug("Did setuid/setgid to {}:{}".format(uid,
 
3128
                                                             gid))
 
3129
    except OSError as error:
 
3130
        logger.warning("Failed to setuid/setgid to {}:{}: {}"
 
3131
                       .format(uid, gid, os.strerror(error.errno)))
 
3132
        if error.errno != errno.EPERM:
 
3133
            raise
 
3134
 
 
3135
    if debug:
 
3136
        # Enable all possible GnuTLS debugging
 
3137
 
 
3138
        # "Use a log level over 10 to enable all debugging options."
 
3139
        # - GnuTLS manual
 
3140
        gnutls.global_set_log_level(11)
 
3141
 
 
3142
        @gnutls.log_func
 
3143
        def debug_gnutls(level, string):
 
3144
            logger.debug("GnuTLS: %s", string[:-1])
 
3145
 
 
3146
        gnutls.global_set_log_function(debug_gnutls)
 
3147
 
 
3148
        # Redirect stdin so all checkers get /dev/null
 
3149
        null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
 
3150
        os.dup2(null, sys.stdin.fileno())
 
3151
        if null > 2:
 
3152
            os.close(null)
 
3153
 
 
3154
    # Need to fork before connecting to D-Bus
 
3155
    if not foreground:
 
3156
        # Close all input and output, do double fork, etc.
 
3157
        daemon()
 
3158
 
 
3159
    # multiprocessing will use threads, so before we use GLib we need
 
3160
    # to inform GLib that threads will be used.
 
3161
    GLib.threads_init()
 
3162
 
742
3163
    global main_loop
743
 
    global bus
744
 
    global server
745
3164
    # From the Avahi example code
746
 
    DBusGMainLoop(set_as_default=True )
747
 
    main_loop = gobject.MainLoop()
 
3165
    DBusGMainLoop(set_as_default=True)
 
3166
    main_loop = GLib.MainLoop()
748
3167
    bus = dbus.SystemBus()
749
 
    server = dbus.Interface(
750
 
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
751
 
            avahi.DBUS_INTERFACE_SERVER )
752
3168
    # End of Avahi example code
753
 
    
754
 
    if debug:
755
 
        console = logging.StreamHandler()
756
 
        # console.setLevel(logging.DEBUG)
757
 
        console.setFormatter(logging.Formatter\
758
 
                             ('%(levelname)s: %(message)s'))
759
 
        logger.addHandler(console)
760
 
        del console
761
 
    
762
 
    clients = Set()
763
 
    def remove_from_clients(client):
764
 
        clients.remove(client)
765
 
        if not clients:
766
 
            logger.critical(u"No clients left, exiting")
767
 
            sys.exit()
768
 
    
769
 
    clients.update(Set(Client(name = section,
770
 
                              stop_hook = remove_from_clients,
771
 
                              config
772
 
                              = dict(client_config.items(section)))
773
 
                       for section in client_config.sections()))
774
 
    if not clients:
775
 
        logger.critical(u"No clients defined")
776
 
        sys.exit(1)
777
 
    
778
 
    if not debug:
779
 
        daemon()
780
 
    
781
 
    pidfilename = "/var/run/mandos/mandos.pid"
782
 
    pid = os.getpid()
783
 
    try:
784
 
        pidfile = open(pidfilename, "w")
785
 
        pidfile.write(str(pid) + "\n")
786
 
        pidfile.close()
 
3169
    if use_dbus:
 
3170
        try:
 
3171
            bus_name = dbus.service.BusName("se.recompile.Mandos",
 
3172
                                            bus,
 
3173
                                            do_not_queue=True)
 
3174
            old_bus_name = dbus.service.BusName(
 
3175
                "se.bsnet.fukt.Mandos", bus,
 
3176
                do_not_queue=True)
 
3177
        except dbus.exceptions.DBusException as e:
 
3178
            logger.error("Disabling D-Bus:", exc_info=e)
 
3179
            use_dbus = False
 
3180
            server_settings["use_dbus"] = False
 
3181
            tcp_server.use_dbus = False
 
3182
    if zeroconf:
 
3183
        protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
 
3184
        service = AvahiServiceToSyslog(
 
3185
            name=server_settings["servicename"],
 
3186
            servicetype="_mandos._tcp",
 
3187
            protocol=protocol,
 
3188
            bus=bus)
 
3189
        if server_settings["interface"]:
 
3190
            service.interface = if_nametoindex(
 
3191
                server_settings["interface"].encode("utf-8"))
 
3192
 
 
3193
    global multiprocessing_manager
 
3194
    multiprocessing_manager = multiprocessing.Manager()
 
3195
 
 
3196
    client_class = Client
 
3197
    if use_dbus:
 
3198
        client_class = functools.partial(ClientDBus, bus=bus)
 
3199
 
 
3200
    client_settings = Client.config_parser(client_config)
 
3201
    old_client_settings = {}
 
3202
    clients_data = {}
 
3203
 
 
3204
    # This is used to redirect stdout and stderr for checker processes
 
3205
    global wnull
 
3206
    wnull = open(os.devnull, "w")  # A writable /dev/null
 
3207
    # Only used if server is running in foreground but not in debug
 
3208
    # mode
 
3209
    if debug or not foreground:
 
3210
        wnull.close()
 
3211
 
 
3212
    # Get client data and settings from last running state.
 
3213
    if server_settings["restore"]:
 
3214
        try:
 
3215
            with open(stored_state_path, "rb") as stored_state:
 
3216
                if sys.version_info.major == 2:
 
3217
                    clients_data, old_client_settings = pickle.load(
 
3218
                        stored_state)
 
3219
                else:
 
3220
                    bytes_clients_data, bytes_old_client_settings = (
 
3221
                        pickle.load(stored_state, encoding="bytes"))
 
3222
                    #   Fix bytes to strings
 
3223
                    #  clients_data
 
3224
                    # .keys()
 
3225
                    clients_data = {(key.decode("utf-8")
 
3226
                                     if isinstance(key, bytes)
 
3227
                                     else key): value
 
3228
                                    for key, value in
 
3229
                                    bytes_clients_data.items()}
 
3230
                    del bytes_clients_data
 
3231
                    for key in clients_data:
 
3232
                        value = {(k.decode("utf-8")
 
3233
                                  if isinstance(k, bytes) else k): v
 
3234
                                 for k, v in
 
3235
                                 clients_data[key].items()}
 
3236
                        clients_data[key] = value
 
3237
                        # .client_structure
 
3238
                        value["client_structure"] = [
 
3239
                            (s.decode("utf-8")
 
3240
                             if isinstance(s, bytes)
 
3241
                             else s) for s in
 
3242
                            value["client_structure"]]
 
3243
                        # .name & .host
 
3244
                        for k in ("name", "host"):
 
3245
                            if isinstance(value[k], bytes):
 
3246
                                value[k] = value[k].decode("utf-8")
 
3247
                        if not value.has_key("key_id"):
 
3248
                            value["key_id"] = ""
 
3249
                        elif not value.has_key("fingerprint"):
 
3250
                            value["fingerprint"] = ""
 
3251
                    #  old_client_settings
 
3252
                    # .keys()
 
3253
                    old_client_settings = {
 
3254
                        (key.decode("utf-8")
 
3255
                         if isinstance(key, bytes)
 
3256
                         else key): value
 
3257
                        for key, value in
 
3258
                        bytes_old_client_settings.items()}
 
3259
                    del bytes_old_client_settings
 
3260
                    # .host
 
3261
                    for value in old_client_settings.values():
 
3262
                        if isinstance(value["host"], bytes):
 
3263
                            value["host"] = (value["host"]
 
3264
                                             .decode("utf-8"))
 
3265
            os.remove(stored_state_path)
 
3266
        except IOError as e:
 
3267
            if e.errno == errno.ENOENT:
 
3268
                logger.warning("Could not load persistent state:"
 
3269
                               " {}".format(os.strerror(e.errno)))
 
3270
            else:
 
3271
                logger.critical("Could not load persistent state:",
 
3272
                                exc_info=e)
 
3273
                raise
 
3274
        except EOFError as e:
 
3275
            logger.warning("Could not load persistent state: "
 
3276
                           "EOFError:",
 
3277
                           exc_info=e)
 
3278
 
 
3279
    with PGPEngine() as pgp:
 
3280
        for client_name, client in clients_data.items():
 
3281
            # Skip removed clients
 
3282
            if client_name not in client_settings:
 
3283
                continue
 
3284
 
 
3285
            # Decide which value to use after restoring saved state.
 
3286
            # We have three different values: Old config file,
 
3287
            # new config file, and saved state.
 
3288
            # New config value takes precedence if it differs from old
 
3289
            # config value, otherwise use saved state.
 
3290
            for name, value in client_settings[client_name].items():
 
3291
                try:
 
3292
                    # For each value in new config, check if it
 
3293
                    # differs from the old config value (Except for
 
3294
                    # the "secret" attribute)
 
3295
                    if (name != "secret"
 
3296
                        and (value !=
 
3297
                             old_client_settings[client_name][name])):
 
3298
                        client[name] = value
 
3299
                except KeyError:
 
3300
                    pass
 
3301
 
 
3302
            # Clients who has passed its expire date can still be
 
3303
            # enabled if its last checker was successful.  A Client
 
3304
            # whose checker succeeded before we stored its state is
 
3305
            # assumed to have successfully run all checkers during
 
3306
            # downtime.
 
3307
            if client["enabled"]:
 
3308
                if datetime.datetime.utcnow() >= client["expires"]:
 
3309
                    if not client["last_checked_ok"]:
 
3310
                        logger.warning(
 
3311
                            "disabling client {} - Client never "
 
3312
                            "performed a successful checker".format(
 
3313
                                client_name))
 
3314
                        client["enabled"] = False
 
3315
                    elif client["last_checker_status"] != 0:
 
3316
                        logger.warning(
 
3317
                            "disabling client {} - Client last"
 
3318
                            " checker failed with error code"
 
3319
                            " {}".format(
 
3320
                                client_name,
 
3321
                                client["last_checker_status"]))
 
3322
                        client["enabled"] = False
 
3323
                    else:
 
3324
                        client["expires"] = (
 
3325
                            datetime.datetime.utcnow()
 
3326
                            + client["timeout"])
 
3327
                        logger.debug("Last checker succeeded,"
 
3328
                                     " keeping {} enabled".format(
 
3329
                                         client_name))
 
3330
            try:
 
3331
                client["secret"] = pgp.decrypt(
 
3332
                    client["encrypted_secret"],
 
3333
                    client_settings[client_name]["secret"])
 
3334
            except PGPError:
 
3335
                # If decryption fails, we use secret from new settings
 
3336
                logger.debug("Failed to decrypt {} old secret".format(
 
3337
                    client_name))
 
3338
                client["secret"] = (client_settings[client_name]
 
3339
                                    ["secret"])
 
3340
 
 
3341
    # Add/remove clients based on new changes made to config
 
3342
    for client_name in (set(old_client_settings)
 
3343
                        - set(client_settings)):
 
3344
        del clients_data[client_name]
 
3345
    for client_name in (set(client_settings)
 
3346
                        - set(old_client_settings)):
 
3347
        clients_data[client_name] = client_settings[client_name]
 
3348
 
 
3349
    # Create all client objects
 
3350
    for client_name, client in clients_data.items():
 
3351
        tcp_server.clients[client_name] = client_class(
 
3352
            name=client_name,
 
3353
            settings=client,
 
3354
            server_settings=server_settings)
 
3355
 
 
3356
    if not tcp_server.clients:
 
3357
        logger.warning("No clients defined")
 
3358
 
 
3359
    if not foreground:
 
3360
        if pidfile is not None:
 
3361
            pid = os.getpid()
 
3362
            try:
 
3363
                with pidfile:
 
3364
                    print(pid, file=pidfile)
 
3365
            except IOError:
 
3366
                logger.error("Could not write to file %r with PID %d",
 
3367
                             pidfilename, pid)
787
3368
        del pidfile
788
 
    except IOError, err:
789
 
        logger.error(u"Could not write %s file with PID %d",
790
 
                     pidfilename, os.getpid())
791
 
    
 
3369
        del pidfilename
 
3370
 
 
3371
    for termsig in (signal.SIGHUP, signal.SIGTERM):
 
3372
        GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,
 
3373
                             lambda: main_loop.quit() and False)
 
3374
 
 
3375
    if use_dbus:
 
3376
 
 
3377
        @alternate_dbus_interfaces(
 
3378
            {"se.recompile.Mandos": "se.bsnet.fukt.Mandos"})
 
3379
        class MandosDBusService(DBusObjectWithObjectManager):
 
3380
            """A D-Bus proxy object"""
 
3381
 
 
3382
            def __init__(self):
 
3383
                dbus.service.Object.__init__(self, bus, "/")
 
3384
 
 
3385
            _interface = "se.recompile.Mandos"
 
3386
 
 
3387
            @dbus.service.signal(_interface, signature="o")
 
3388
            def ClientAdded(self, objpath):
 
3389
                "D-Bus signal"
 
3390
                pass
 
3391
 
 
3392
            @dbus.service.signal(_interface, signature="ss")
 
3393
            def ClientNotFound(self, key_id, address):
 
3394
                "D-Bus signal"
 
3395
                pass
 
3396
 
 
3397
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
 
3398
                               "true"})
 
3399
            @dbus.service.signal(_interface, signature="os")
 
3400
            def ClientRemoved(self, objpath, name):
 
3401
                "D-Bus signal"
 
3402
                pass
 
3403
 
 
3404
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
 
3405
                               "true"})
 
3406
            @dbus.service.method(_interface, out_signature="ao")
 
3407
            def GetAllClients(self):
 
3408
                "D-Bus method"
 
3409
                return dbus.Array(c.dbus_object_path for c in
 
3410
                                  tcp_server.clients.values())
 
3411
 
 
3412
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
 
3413
                               "true"})
 
3414
            @dbus.service.method(_interface,
 
3415
                                 out_signature="a{oa{sv}}")
 
3416
            def GetAllClientsWithProperties(self):
 
3417
                "D-Bus method"
 
3418
                return dbus.Dictionary(
 
3419
                    {c.dbus_object_path: c.GetAll(
 
3420
                        "se.recompile.Mandos.Client")
 
3421
                     for c in tcp_server.clients.values()},
 
3422
                    signature="oa{sv}")
 
3423
 
 
3424
            @dbus.service.method(_interface, in_signature="o")
 
3425
            def RemoveClient(self, object_path):
 
3426
                "D-Bus method"
 
3427
                for c in tcp_server.clients.values():
 
3428
                    if c.dbus_object_path == object_path:
 
3429
                        del tcp_server.clients[c.name]
 
3430
                        c.remove_from_connection()
 
3431
                        # Don't signal the disabling
 
3432
                        c.disable(quiet=True)
 
3433
                        # Emit D-Bus signal for removal
 
3434
                        self.client_removed_signal(c)
 
3435
                        return
 
3436
                raise KeyError(object_path)
 
3437
 
 
3438
            del _interface
 
3439
 
 
3440
            @dbus.service.method(dbus.OBJECT_MANAGER_IFACE,
 
3441
                                 out_signature="a{oa{sa{sv}}}")
 
3442
            def GetManagedObjects(self):
 
3443
                """D-Bus method"""
 
3444
                return dbus.Dictionary(
 
3445
                    {client.dbus_object_path:
 
3446
                     dbus.Dictionary(
 
3447
                         {interface: client.GetAll(interface)
 
3448
                          for interface in
 
3449
                          client._get_all_interface_names()})
 
3450
                     for client in tcp_server.clients.values()})
 
3451
 
 
3452
            def client_added_signal(self, client):
 
3453
                """Send the new standard signal and the old signal"""
 
3454
                if use_dbus:
 
3455
                    # New standard signal
 
3456
                    self.InterfacesAdded(
 
3457
                        client.dbus_object_path,
 
3458
                        dbus.Dictionary(
 
3459
                            {interface: client.GetAll(interface)
 
3460
                             for interface in
 
3461
                             client._get_all_interface_names()}))
 
3462
                    # Old signal
 
3463
                    self.ClientAdded(client.dbus_object_path)
 
3464
 
 
3465
            def client_removed_signal(self, client):
 
3466
                """Send the new standard signal and the old signal"""
 
3467
                if use_dbus:
 
3468
                    # New standard signal
 
3469
                    self.InterfacesRemoved(
 
3470
                        client.dbus_object_path,
 
3471
                        client._get_all_interface_names())
 
3472
                    # Old signal
 
3473
                    self.ClientRemoved(client.dbus_object_path,
 
3474
                                       client.name)
 
3475
 
 
3476
        mandos_dbus_service = MandosDBusService()
 
3477
 
 
3478
    # Save modules to variables to exempt the modules from being
 
3479
    # unloaded before the function registered with atexit() is run.
 
3480
    mp = multiprocessing
 
3481
    wn = wnull
 
3482
 
792
3483
    def cleanup():
793
3484
        "Cleanup function; run on exit"
794
 
        global group
795
 
        # From the Avahi example code
796
 
        if not group is None:
797
 
            group.Free()
798
 
            group = None
799
 
        # End of Avahi example code
800
 
        
801
 
        while clients:
802
 
            client = clients.pop()
803
 
            client.stop_hook = None
804
 
            client.stop()
805
 
    
 
3485
        if zeroconf:
 
3486
            service.cleanup()
 
3487
 
 
3488
        mp.active_children()
 
3489
        wn.close()
 
3490
        if not (tcp_server.clients or client_settings):
 
3491
            return
 
3492
 
 
3493
        # Store client before exiting. Secrets are encrypted with key
 
3494
        # based on what config file has. If config file is
 
3495
        # removed/edited, old secret will thus be unrecovable.
 
3496
        clients = {}
 
3497
        with PGPEngine() as pgp:
 
3498
            for client in tcp_server.clients.values():
 
3499
                key = client_settings[client.name]["secret"]
 
3500
                client.encrypted_secret = pgp.encrypt(client.secret,
 
3501
                                                      key)
 
3502
                client_dict = {}
 
3503
 
 
3504
                # A list of attributes that can not be pickled
 
3505
                # + secret.
 
3506
                exclude = {"bus", "changedstate", "secret",
 
3507
                           "checker", "server_settings"}
 
3508
                for name, typ in inspect.getmembers(dbus.service
 
3509
                                                    .Object):
 
3510
                    exclude.add(name)
 
3511
 
 
3512
                client_dict["encrypted_secret"] = (client
 
3513
                                                   .encrypted_secret)
 
3514
                for attr in client.client_structure:
 
3515
                    if attr not in exclude:
 
3516
                        client_dict[attr] = getattr(client, attr)
 
3517
 
 
3518
                clients[client.name] = client_dict
 
3519
                del client_settings[client.name]["secret"]
 
3520
 
 
3521
        try:
 
3522
            with tempfile.NamedTemporaryFile(
 
3523
                    mode='wb',
 
3524
                    suffix=".pickle",
 
3525
                    prefix='clients-',
 
3526
                    dir=os.path.dirname(stored_state_path),
 
3527
                    delete=False) as stored_state:
 
3528
                pickle.dump((clients, client_settings), stored_state,
 
3529
                            protocol=2)
 
3530
                tempname = stored_state.name
 
3531
            os.rename(tempname, stored_state_path)
 
3532
        except (IOError, OSError) as e:
 
3533
            if not debug:
 
3534
                try:
 
3535
                    os.remove(tempname)
 
3536
                except NameError:
 
3537
                    pass
 
3538
            if e.errno in (errno.ENOENT, errno.EACCES, errno.EEXIST):
 
3539
                logger.warning("Could not save persistent state: {}"
 
3540
                               .format(os.strerror(e.errno)))
 
3541
            else:
 
3542
                logger.warning("Could not save persistent state:",
 
3543
                               exc_info=e)
 
3544
                raise
 
3545
 
 
3546
        # Delete all clients, and settings from config
 
3547
        while tcp_server.clients:
 
3548
            name, client = tcp_server.clients.popitem()
 
3549
            if use_dbus:
 
3550
                client.remove_from_connection()
 
3551
            # Don't signal the disabling
 
3552
            client.disable(quiet=True)
 
3553
            # Emit D-Bus signal for removal
 
3554
            if use_dbus:
 
3555
                mandos_dbus_service.client_removed_signal(client)
 
3556
        client_settings.clear()
 
3557
 
806
3558
    atexit.register(cleanup)
807
 
    
808
 
    if not debug:
809
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
810
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
811
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
812
 
    
813
 
    for client in clients:
814
 
        client.start()
815
 
    
816
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
817
 
                                 server_settings["port"]),
818
 
                                tcp_handler,
819
 
                                settings=server_settings,
820
 
                                clients=clients)
 
3559
 
 
3560
    for client in tcp_server.clients.values():
 
3561
        if use_dbus:
 
3562
            # Emit D-Bus signal for adding
 
3563
            mandos_dbus_service.client_added_signal(client)
 
3564
        # Need to initiate checking of clients
 
3565
        if client.enabled:
 
3566
            client.init_checker()
 
3567
 
 
3568
    tcp_server.enable()
 
3569
    tcp_server.server_activate()
 
3570
 
821
3571
    # Find out what port we got
822
 
    service.port = tcp_server.socket.getsockname()[1]
823
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
824
 
                u" scope_id %d" % tcp_server.socket.getsockname())
825
 
    
826
 
    #service.interface = tcp_server.socket.getsockname()[3]
827
 
    
 
3572
    if zeroconf:
 
3573
        service.port = tcp_server.socket.getsockname()[1]
 
3574
    if use_ipv6:
 
3575
        logger.info("Now listening on address %r, port %d,"
 
3576
                    " flowinfo %d, scope_id %d",
 
3577
                    *tcp_server.socket.getsockname())
 
3578
    else:                       # IPv4
 
3579
        logger.info("Now listening on address %r, port %d",
 
3580
                    *tcp_server.socket.getsockname())
 
3581
 
 
3582
    # service.interface = tcp_server.socket.getsockname()[3]
 
3583
 
828
3584
    try:
829
 
        # From the Avahi example code
830
 
        server.connect_to_signal("StateChanged", server_state_changed)
831
 
        try:
832
 
            server_state_changed(server.GetState())
833
 
        except dbus.exceptions.DBusException, error:
834
 
            logger.critical(u"DBusException: %s", error)
835
 
            sys.exit(1)
836
 
        # End of Avahi example code
837
 
        
838
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
839
 
                             lambda *args, **kwargs:
840
 
                             tcp_server.handle_request\
841
 
                             (*args[2:], **kwargs) or True)
842
 
        
843
 
        logger.debug(u"Starting main loop")
844
 
        main_loop_started = True
 
3585
        if zeroconf:
 
3586
            # From the Avahi example code
 
3587
            try:
 
3588
                service.activate()
 
3589
            except dbus.exceptions.DBusException as error:
 
3590
                logger.critical("D-Bus Exception", exc_info=error)
 
3591
                cleanup()
 
3592
                sys.exit(1)
 
3593
            # End of Avahi example code
 
3594
 
 
3595
        GLib.io_add_watch(tcp_server.fileno(), GLib.IO_IN,
 
3596
                          lambda *args, **kwargs:
 
3597
                          (tcp_server.handle_request
 
3598
                           (*args[2:], **kwargs) or True))
 
3599
 
 
3600
        logger.debug("Starting main loop")
845
3601
        main_loop.run()
846
 
    except AvahiError, error:
847
 
        logger.critical(u"AvahiError: %s" + unicode(error))
 
3602
    except AvahiError as error:
 
3603
        logger.critical("Avahi Error", exc_info=error)
 
3604
        cleanup()
848
3605
        sys.exit(1)
849
3606
    except KeyboardInterrupt:
850
3607
        if debug:
851
 
            print
 
3608
            print("", file=sys.stderr)
 
3609
        logger.debug("Server received KeyboardInterrupt")
 
3610
    logger.debug("Server exiting")
 
3611
    # Must run before the D-Bus bus name gets deregistered
 
3612
    cleanup()
 
3613
 
852
3614
 
853
3615
if __name__ == '__main__':
854
3616
    main()