/mandos/trunk : revision 659

11

# "AvahiService" class, and some lines in "main".

12

#

13

# Everything else is

14

15

14

15

16

#

17

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

18

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

68

import binascii

69

import tempfile

70

import itertools

71

import collections

71

72

73

import dbus

73

74

import dbus.service

78

79

import ctypes.util

79

80

import xml.dom.minidom

80

81

import inspect

81

import GnuPGInterface

82

83

try:

84

SO_BINDTODEVICE = socket.SO_BINDTODEVICE

88

except ImportError:

89

SO_BINDTODEVICE = None

90

91

version = "1.6.0"

91

version = "1.6.4"

92

stored_state_file = "clients.pickle"

93

94

logger = logging.getLogger()

95

syslogger = (logging.handlers.SysLogHandler

96

(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

97

address = str("/dev/log")))

95

syslogger = None

98

96

99

97

try:

100

98

if_nametoindex = (ctypes.cdll.LoadLibrary

116

114

def initlogger(debug, level=logging.WARNING):

117

115

"""init logger and add loglevel"""

118

116

117

syslogger = (logging.handlers.SysLogHandler

118

(facility =

119

logging.handlers.SysLogHandler.LOG_DAEMON,

120

address = str("/dev/log")))

119

121

syslogger.setFormatter(logging.Formatter

120

122

('Mandos [%(process)d]: %(levelname)s:'

121

123

' %(message)s'))

139

141

class PGPEngine(object):

140

142

"""A simple class for OpenPGP symmetric encryption & decryption"""

141

143

def __init__(self):

142

self.gnupg = GnuPGInterface.GnuPG()

143

144

self.tempdir = tempfile.mkdtemp(prefix="mandos-")

144

self.gnupg = GnuPGInterface.GnuPG()

145

self.gnupg.options.meta_interactive = False

146

self.gnupg.options.homedir = self.tempdir

147

self.gnupg.options.extra_args.extend(['--force-mdc',

148

'--quiet',

149

'--no-use-agent'])

145

self.gnupgargs = ['--batch',

146

'--home', self.tempdir,

147

'--force-mdc',

148

'--quiet',

149

'--no-use-agent']

150

151

def __enter__(self):

152

return self

174

def password_encode(self, password):

175

# Passphrase can not be empty and can not contain newlines or

176

# NUL bytes. So we prefix it and hex encode it.

177

return b"mandos" + binascii.hexlify(password)

177

encoded = b"mandos" + binascii.hexlify(password)

178

if len(encoded) > 2048:

179

# GnuPG can't handle long passwords, so encode differently

180

encoded = (b"mandos" + password.replace(b"\\", b"\\\\")

181

.replace(b"\n", b"\\n")

182

.replace(b"\0", b"\\x00"))

183

return encoded

178

184

179

185

def encrypt(self, data, password):

180

self.gnupg.passphrase = self.password_encode(password)

181

with open(os.devnull, "w") as devnull:

182

try:

183

proc = self.gnupg.run(['--symmetric'],

184

create_fhs=['stdin', 'stdout'],

185

attach_fhs={'stderr': devnull})

186

with contextlib.closing(proc.handles['stdin']) as f:

187

f.write(data)

188

with contextlib.closing(proc.handles['stdout']) as f:

189

ciphertext = f.read()

190

proc.wait()

191

except IOError as e:

192

raise PGPError(e)

193

self.gnupg.passphrase = None

186

passphrase = self.password_encode(password)

187

with tempfile.NamedTemporaryFile(dir=self.tempdir

188

) as passfile:

189

passfile.write(passphrase)

190

passfile.flush()

191

proc = subprocess.Popen(['gpg', '--symmetric',

192

'--passphrase-file',

193

passfile.name]

194

+ self.gnupgargs,

195

stdin = subprocess.PIPE,

196

stdout = subprocess.PIPE,

197

stderr = subprocess.PIPE)

198

ciphertext, err = proc.communicate(input = data)

199

if proc.returncode != 0:

200

raise PGPError(err)

194

201

return ciphertext

195

202

196

203

def decrypt(self, data, password):

197

self.gnupg.passphrase = self.password_encode(password)

198

with open(os.devnull, "w") as devnull:

199

try:

200

proc = self.gnupg.run(['--decrypt'],

201

create_fhs=['stdin', 'stdout'],

202

attach_fhs={'stderr': devnull})

203

with contextlib.closing(proc.handles['stdin']) as f:

204

f.write(data)

205

with contextlib.closing(proc.handles['stdout']) as f:

206

decrypted_plaintext = f.read()

207

proc.wait()

208

except IOError as e:

209

raise PGPError(e)

210

self.gnupg.passphrase = None

204

passphrase = self.password_encode(password)

205

with tempfile.NamedTemporaryFile(dir = self.tempdir

206

) as passfile:

207

passfile.write(passphrase)

208

passfile.flush()

209

proc = subprocess.Popen(['gpg', '--decrypt',

210

'--passphrase-file',

211

passfile.name]

212

+ self.gnupgargs,

213

stdin = subprocess.PIPE,

214

stdout = subprocess.PIPE,

215

stderr = subprocess.PIPE)

216

decrypted_plaintext, err = proc.communicate(input

217

= data)

218

if proc.returncode != 0:

219

raise PGPError(err)

211

220

return decrypted_plaintext

212

221

213

222

233

242

Used to optionally bind to the specified interface.

234

243

name: string; Example: 'Mandos'

235

244

type: string; Example: '_mandos._tcp'.

236

See <http://www.dns-sd.org/ServiceTypes.html>

245

See <https://www.iana.org/assignments/service-names-port-numbers>

237

246

port: integer; what port to announce

238

247

TXT: list of strings; TXT record for the service

239

248

domain: string; Domain to publish on, default to .local if empty.

439

448

runtime_expansions: Allowed attributes for runtime expansion.

440

449

expires: datetime.datetime(); time (UTC) when a client will be

441

450

disabled, or None

451

server_settings: The server_settings dict from main()

442

452

"""

443

453

444

454

runtime_expansions = ("approval_delay", "approval_duration",

446

456

"fingerprint", "host", "interval",

447

457

"last_approval_request", "last_checked_ok",

448

458

"last_enabled", "name", "timeout")

449

client_defaults = { "timeout": "5m",

450

"extended_timeout": "15m",

451

"interval": "2m",

459

client_defaults = { "timeout": "PT5M",

460

"extended_timeout": "PT15M",

461

"interval": "PT2M",

452

462

"checker": "fping -q -- %%(host)s",

453

463

"host": "",

454

"approval_delay": "0s",

455

"approval_duration": "1s",

464

"approval_delay": "PT0S",

465

"approval_duration": "PT1S",

456

466

"approved_by_default": "True",

457

467

"enabled": "True",

458

468

}

519

529

520

530

return settings

521

531

522

def __init__(self, settings, name = None):

532

def __init__(self, settings, name = None, server_settings=None):

523

533

self.name = name

534

if server_settings is None:

535

server_settings = {}

536

self.server_settings = server_settings

524

537

# adding all client settings

525

538

for setting, value in settings.iteritems():

526

539

setattr(self, setting, value)

679

692

# If a checker exists, make sure it is not a zombie

680

693

try:

681

694

pid, status = os.waitpid(self.checker.pid, os.WNOHANG)

682

except (AttributeError, OSError) as error:

683

if (isinstance(error, OSError)

684

and error.errno != errno.ECHILD):

685

raise error

695

except AttributeError:

696

pass

697

except OSError as error:

698

if error.errno != errno.ECHILD:

699

raise

686

700

else:

687

701

if pid:

688

702

logger.warning("Checker was a zombie")

710

724

# in normal mode, that is already done by daemon(),

711

725

# and in debug mode we don't want to. (Stdin is

712

726

# always replaced by /dev/null.)

727

# The exception is when not debugging but nevertheless

728

# running in the foreground; use the previously

729

# created wnull.

730

popen_args = {}

731

if (not self.server_settings["debug"]

732

and self.server_settings["foreground"]):

733

popen_args.update({"stdout": wnull,

734

"stderr": wnull })

713

735

self.checker = subprocess.Popen(command,

714

736

close_fds=True,

715

shell=True, cwd="/")

737

shell=True, cwd="/",

738

**popen_args)

716

739

except OSError as error:

717

740

logger.error("Failed to start subprocess",

718

741

exc_info=error)

742

return True

719

743

self.checker_callback_tag = (gobject.child_watch_add

720

744

(self.checker.pid,

721

745

self.checker_callback,

722

746

data=command))

723

747

# The checker may have completed before the gobject

724

748

# watch was added. Check for this.

725

pid, status = os.waitpid(self.checker.pid, os.WNOHANG)

749

try:

750

pid, status = os.waitpid(self.checker.pid, os.WNOHANG)

751

except OSError as error:

752

if error.errno == errno.ECHILD:

753

# This should never happen

754

logger.error("Child process vanished",

755

exc_info=error)

756

return True

757

raise

726

758

if pid:

727

759

gobject.source_remove(self.checker_callback_tag)

728

760

self.checker_callback(pid, status, command)

904

936

# The byte_arrays option is not supported yet on

905

937

# signatures other than "ay".

906

938

if prop._dbus_signature != "ay":

907

raise ValueError

939

raise ValueError("Byte arrays not supported for non-"

940

"'ay' signature {0!r}"

941

.format(prop._dbus_signature))

908

942

value = dbus.ByteArray(b''.join(chr(byte)

909

943

for byte in value))

910

944

prop(value)

1068

1102

interface_names.add(alt_interface)

1069

1103

# Is this a D-Bus signal?

1070

1104

if getattr(attribute, "_dbus_is_signal", False):

1071

# Extract the original non-method function by

1072

# black magic

1105

# Extract the original non-method undecorated

1106

# function by black magic

1073

1107

nonmethod_func = (dict(

1074

1108

zip(attribute.func_code.co_freevars,

1075

1109

attribute.__closure__))["func"]

1318

1352

*args, **kwargs)

1319

1353

1320

1354

def start_checker(self, *args, **kwargs):

1321

old_checker = self.checker

1322

if self.checker is not None:

1323

old_checker_pid = self.checker.pid

1324

else:

1325

old_checker_pid = None

1355

old_checker_pid = getattr(self.checker, "pid", None)

1326

1356

r = Client.start_checker(self, *args, **kwargs)

1327

1357

# Only if new checker process was started

1328

1358

if (self.checker is not None

1673

1703

logger.debug("Protocol version: %r", line)

1674

1704

try:

1675

1705

if int(line.strip().split()[0]) > 1:

1676

raise RuntimeError

1706

raise RuntimeError(line)

1677

1707

except (ValueError, IndexError, RuntimeError) as error:

1678

1708

logger.error("Unknown protocol version: %s", error)

1679

1709

return

1886

1916

1887

1917

def add_pipe(self, parent_pipe, proc):

1888

1918

"""Dummy function; override as necessary"""

1889

raise NotImplementedError

1919

raise NotImplementedError()

1890

1920

1891

1921

1892

1922

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1968

1998

if self.address_family == socket.AF_INET6:

1969

1999

any_address = "::" # in6addr_any

1970

2000

else:

1971

any_address = socket.INADDR_ANY

2001

any_address = "0.0.0.0" # INADDR_ANY

1972

2002

self.server_address = (any_address,

1973

2003

self.server_address[1])

1974

2004

elif not self.server_address[1]:

2090

2120

return True

2091

2121

2092

2122

2123

def rfc3339_duration_to_delta(duration):

2124

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

2125

2126

>>> rfc3339_duration_to_delta("P7D")

2127

datetime.timedelta(7)

2128

>>> rfc3339_duration_to_delta("PT60S")

2129

datetime.timedelta(0, 60)

2130

>>> rfc3339_duration_to_delta("PT60M")

2131

datetime.timedelta(0, 3600)

2132

>>> rfc3339_duration_to_delta("PT24H")

2133

datetime.timedelta(1)

2134

>>> rfc3339_duration_to_delta("P1W")

2135

datetime.timedelta(7)

2136

>>> rfc3339_duration_to_delta("PT5M30S")

2137

datetime.timedelta(0, 330)

2138

>>> rfc3339_duration_to_delta("P1DT3M20S")

2139

datetime.timedelta(1, 200)

2140

"""

2141

2142

# Parsing an RFC 3339 duration with regular expressions is not

2143

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

2144

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

2145

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

2146

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

2147

# avoid excessive use of external libraries.

2148

2149

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

2150

Token = collections.namedtuple("Token",

2151

("regexp", # To match token; if

2152

# "value" is not None,

2153

# must have a "group"

2154

# containing digits

2155

"value", # datetime.timedelta or

2156

# None

2157

"followers")) # Tokens valid after

2158

# this token

2159

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

2160

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

2161

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

2162

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

2163

datetime.timedelta(seconds=1),

2164

frozenset((token_end,)))

2165

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

2166

datetime.timedelta(minutes=1),

2167

frozenset((token_second, token_end)))

2168

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

2169

datetime.timedelta(hours=1),

2170

frozenset((token_minute, token_end)))

2171

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

2172

None,

2173

frozenset((token_hour, token_minute,

2174

token_second)))

2175

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

2176

datetime.timedelta(days=1),

2177

frozenset((token_time, token_end)))

2178

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

2179

datetime.timedelta(weeks=4),

2180

frozenset((token_day, token_end)))

2181

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

2182

datetime.timedelta(weeks=52),

2183

frozenset((token_month, token_end)))

2184

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

2185

datetime.timedelta(weeks=1),

2186

frozenset((token_end,)))

2187

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

2188

frozenset((token_year, token_month,

2189

token_day, token_time,

2190

token_week))),

2191

# Define starting values

2192

value = datetime.timedelta() # Value so far

2193

found_token = None

2194

followers = frozenset(token_duration,) # Following valid tokens

2195

s = duration # String left to parse

2196

# Loop until end token is found

2197

while found_token is not token_end:

2198

# Search for any currently valid tokens

2199

for token in followers:

2200

match = token.regexp.match(s)

2201

if match is not None:

2202

# Token found

2203

if token.value is not None:

2204

# Value found, parse digits

2205

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

2206

# Add to value so far

2207

value += factor * token.value

2208

# Strip token from string

2209

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

2210

# Go to found token

2211

found_token = token

2212

# Set valid next tokens

2213

followers = found_token.followers

2214

break

2215

else:

2216

# No currently valid tokens were found

2217

raise ValueError("Invalid RFC 3339 duration")

2218

# End token found

2219

return value

2220

2221

2093

2222

def string_to_delta(interval):

2094

2223

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

2095

2224

2106

2235

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

2107

2236

datetime.timedelta(0, 330)

2108

2237

"""

2238

2239

try:

2240

return rfc3339_duration_to_delta(interval)

2241

except ValueError:

2242

pass

2243

2109

2244

timevalue = datetime.timedelta(0)

2110

2245

for s in interval.split():

2111

2246

try:

2124

2259

else:

2125

2260

raise ValueError("Unknown suffix {0!r}"

2126

2261

.format(suffix))

2127

except (ValueError, IndexError) as e:

2262

except IndexError as e:

2128

2263

raise ValueError(*(e.args))

2129

2264

timevalue += delta

2130

2265

return timevalue

2174

2309

help="Run self-test")

2175

2310

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

2176

2311

help="Debug mode; run in foreground and log"

2177

" to terminal")

2312

" to terminal", default=None)

2178

2313

parser.add_argument("--debuglevel", metavar="LEVEL",

2179

2314

help="Debug level for stdout output")

2180

2315

parser.add_argument("--priority", help="GnuTLS"

2187

2322

" files")

2188

2323

parser.add_argument("--no-dbus", action="store_false",

2189

2324

dest="use_dbus", help="Do not provide D-Bus"

2190

" system bus interface")

2325

" system bus interface", default=None)

2191

2326

parser.add_argument("--no-ipv6", action="store_false",

2192

dest="use_ipv6", help="Do not use IPv6")

2327

dest="use_ipv6", help="Do not use IPv6",

2328

default=None)

2193

2329

parser.add_argument("--no-restore", action="store_false",

2194

2330

dest="restore", help="Do not restore stored"

2195

" state")

2331

" state", default=None)

2196

2332

parser.add_argument("--socket", type=int,

2197

2333

help="Specify a file descriptor to a network"

2198

2334

" socket to use instead of creating one")

2199

2335

parser.add_argument("--statedir", metavar="DIR",

2200

2336

help="Directory to save/restore state in")

2201

2337

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

2202

help="Run in foreground")

2338

help="Run in foreground", default=None)

2203

2339

2204

2340

options = parser.parse_args()

2205

2341

2206

2342

if options.check:

2207

2343

import doctest

2208

doctest.testmod()

2209

sys.exit()

2344

fail_count, test_count = doctest.testmod()

2345

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

2210

2346

2211

2347

# Default values for config file for server-global settings

2212

2348

server_defaults = { "interface": "",

2214

2350

"port": "",

2215

2351

"debug": "False",

2216

2352

"priority":

2217

"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",

2353

"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:+SIGN-RSA-SHA224:+SIGN-RSA-RMD160",

2218

2354

"servicename": "Mandos",

2219

2355

"use_dbus": "True",

2220

2356

"use_ipv6": "True",

2264

2400

for option in server_settings.keys():

2265

2401

if type(server_settings[option]) is str:

2266

2402

server_settings[option] = unicode(server_settings[option])

2403

# Force all boolean options to be boolean

2404

for option in ("debug", "use_dbus", "use_ipv6", "restore",

2405

"foreground"):

2406

server_settings[option] = bool(server_settings[option])

2267

2407

# Debug implies foreground

2268

2408

if server_settings["debug"]:

2269

2409

server_settings["foreground"] = True

2317

2457

socketfd=(server_settings["socket"]

2318

2458

or None))

2319

2459

if not foreground:

2320

pidfilename = "/var/run/mandos.pid"

2460

pidfilename = "/run/mandos.pid"

2461

if not os.path.isdir("/run/."):

2462

pidfilename = "/var/run/mandos.pid"

2321

2463

pidfile = None

2322

2464

try:

2323

2465

pidfile = open(pidfilename, "w")

2340

2482

os.setuid(uid)

2341

2483

except OSError as error:

2342

2484

if error.errno != errno.EPERM:

2343

raise error

2485

raise

2344

2486

2345

2487

if debug:

2346

2488

# Enable all possible GnuTLS debugging

2409

2551

old_client_settings = {}

2410

2552

clients_data = {}

2411

2553

2554

# This is used to redirect stdout and stderr for checker processes

2555

global wnull

2556

wnull = open(os.devnull, "w") # A writable /dev/null

2557

# Only used if server is running in foreground but not in debug

2558

# mode

2559

if debug or not foreground:

2560

wnull.close()

2561

2412

2562

# Get client data and settings from last running state.

2413

2563

if server_settings["restore"]:

2414

2564

try:

2430

2580

2431

2581

with PGPEngine() as pgp:

2432

2582

for client_name, client in clients_data.iteritems():

2583

# Skip removed clients

2584

if client_name not in client_settings:

2585

continue

2586

2433

2587

# Decide which value to use after restoring saved state.

2434

2588

# We have three different values: Old config file,

2435

2589

# new config file, and saved state.

2497

2651

# Create all client objects

2498

2652

for client_name, client in clients_data.iteritems():

2499

2653

tcp_server.clients[client_name] = client_class(

2500

name = client_name, settings = client)

2654

name = client_name, settings = client,

2655

server_settings = server_settings)

2501

2656

2502

2657

if not tcp_server.clients:

2503

2658

logger.warning("No clients defined")

2586

2741

service.cleanup()

2587

2742

2588

2743

multiprocessing.active_children()

2744

wnull.close()

2589

2745

if not (tcp_server.clients or client_settings):

2590

2746

return

2591

2747

2603

2759

# A list of attributes that can not be pickled

2604

2760

# + secret.

2605

2761

exclude = set(("bus", "changedstate", "secret",

2606

"checker"))

2762

"checker", "server_settings"))

2607

2763

for name, typ in (inspect.getmembers

2608

2764

(dbus.service.Object)):

2609

2765

exclude.add(name)

2637

2793

else:

2638

2794

logger.warning("Could not save persistent state:",

2639

2795

exc_info=e)

2640

raise e

2796

raise

2641

2797

2642

2798

# Delete all clients, and settings from config

2643

2799

while tcp_server.clients: