/mandos/release : revision 302

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

72

71

73

72

import dbus

74

73

import dbus.service

79

78

import ctypes.util

80

79

import xml.dom.minidom

81

80

import inspect

81

import GnuPGInterface

82

83

try:

84

SO_BINDTODEVICE = socket.SO_BINDTODEVICE

88

except ImportError:

89

SO_BINDTODEVICE = None

90

91

version = "1.6.2"

91

version = "1.6.0"

92

stored_state_file = "clients.pickle"

93

94

logger = logging.getLogger()

139

class PGPEngine(object):

140

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

141

def __init__(self):

142

self.gnupg = GnuPGInterface.GnuPG()

142

143

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

143

self.gnupgargs = ['--batch',

144

'--home', self.tempdir,

145

'--force-mdc',

146

'--quiet',

147

'--no-use-agent']

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'])

148

150

149

151

def __enter__(self):

150

152

return self

172

174

def password_encode(self, password):

173

175

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

174

176

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

175

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

176

if len(encoded) > 2048:

177

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

178

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

179

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

180

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

181

return encoded

177

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

182

178

183

179

def encrypt(self, data, password):

184

passphrase = self.password_encode(password)

185

with tempfile.NamedTemporaryFile(dir=self.tempdir

186

) as passfile:

187

passfile.write(passphrase)

188

passfile.flush()

189

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

190

'--passphrase-file',

191

passfile.name]

192

+ self.gnupgargs,

193

stdin = subprocess.PIPE,

194

stdout = subprocess.PIPE,

195

stderr = subprocess.PIPE)

196

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

197

if proc.returncode != 0:

198

raise PGPError(err)

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

199

194

return ciphertext

200

195

201

196

def decrypt(self, data, password):

202

passphrase = self.password_encode(password)

203

with tempfile.NamedTemporaryFile(dir = self.tempdir

204

) as passfile:

205

passfile.write(passphrase)

206

passfile.flush()

207

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

208

'--passphrase-file',

209

passfile.name]

210

+ self.gnupgargs,

211

stdin = subprocess.PIPE,

212

stdout = subprocess.PIPE,

213

stderr = subprocess.PIPE)

214

decrypted_plaintext, err = proc.communicate(input

215

= data)

216

if proc.returncode != 0:

217

raise PGPError(err)

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

218

211

return decrypted_plaintext

219

212

220

213

240

233

Used to optionally bind to the specified interface.

241

234

name: string; Example: 'Mandos'

242

235

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

243

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

236

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

244

237

port: integer; what port to announce

245

238

TXT: list of strings; TXT record for the service

246

239

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

446

439

runtime_expansions: Allowed attributes for runtime expansion.

447

440

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

448

441

disabled, or None

449

server_settings: The server_settings dict from main()

450

442

"""

451

443

452

444

runtime_expansions = ("approval_delay", "approval_duration",

454

446

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

455

447

"last_approval_request", "last_checked_ok",

456

448

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

457

client_defaults = { "timeout": "PT5M",

458

"extended_timeout": "PT15M",

459

"interval": "PT2M",

449

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

450

"extended_timeout": "15m",

451

"interval": "2m",

460

452

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

461

453

"host": "",

462

"approval_delay": "PT0S",

463

"approval_duration": "PT1S",

454

"approval_delay": "0s",

455

"approval_duration": "1s",

464

456

"approved_by_default": "True",

465

457

"enabled": "True",

466

458

}

527

519

528

520

return settings

529

521

530

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

522

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

531

523

self.name = name

532

if server_settings is None:

533

server_settings = {}

534

self.server_settings = server_settings

535

524

# adding all client settings

536

525

for setting, value in settings.iteritems():

537

526

setattr(self, setting, value)

690

679

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

691

680

try:

692

681

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

693

except AttributeError:

694

pass

695

except OSError as error:

696

if error.errno != errno.ECHILD:

697

raise

682

except (AttributeError, OSError) as error:

683

if (isinstance(error, OSError)

684

and error.errno != errno.ECHILD):

685

raise error

698

686

else:

699

687

if pid:

700

688

logger.warning("Checker was a zombie")

722

710

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

723

711

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

724

712

# always replaced by /dev/null.)

725

# The exception is when not debugging but nevertheless

726

# running in the foreground; use the previously

727

# created wnull.

728

popen_args = {}

729

if (not self.server_settings["debug"]

730

and self.server_settings["foreground"]):

731

popen_args.update({"stdout": wnull,

732

"stderr": wnull })

733

713

self.checker = subprocess.Popen(command,

734

714

close_fds=True,

735

shell=True, cwd="/",

736

**popen_args)

715

shell=True, cwd="/")

737

716

except OSError as error:

738

717

logger.error("Failed to start subprocess",

739

718

exc_info=error)

740

return True

741

719

self.checker_callback_tag = (gobject.child_watch_add

742

720

(self.checker.pid,

743

721

self.checker_callback,

744

722

data=command))

745

723

# The checker may have completed before the gobject

746

724

# watch was added. Check for this.

747

try:

748

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

749

except OSError as error:

750

if error.errno == errno.ECHILD:

751

# This should never happen

752

logger.error("Child process vanished",

753

exc_info=error)

754

return True

755

raise

725

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

756

726

if pid:

757

727

gobject.source_remove(self.checker_callback_tag)

758

728

self.checker_callback(pid, status, command)

1098

1068

interface_names.add(alt_interface)

1099

1069

# Is this a D-Bus signal?

1100

1070

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

1101

# Extract the original non-method undecorated

1102

# function by black magic

1071

# Extract the original non-method function by

1072

# black magic

1103

1073

nonmethod_func = (dict(

1104

1074

zip(attribute.func_code.co_freevars,

1105

1075

attribute.__closure__))["func"]

1703

1673

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

1704

1674

try:

1705

1675

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

1706

raise RuntimeError(line)

1676

raise RuntimeError

1707

1677

except (ValueError, IndexError, RuntimeError) as error:

1708

1678

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

1709

1679

return

1916

1886

1917

1887

def add_pipe(self, parent_pipe, proc):

1918

1888

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

1919

raise NotImplementedError()

1889

raise NotImplementedError

1920

1890

1921

1891

1922

1892

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1998

1968

if self.address_family == socket.AF_INET6:

1999

1969

any_address = "::" # in6addr_any

2000

1970

else:

2001

any_address = "0.0.0.0" # INADDR_ANY

1971

any_address = socket.INADDR_ANY

2002

1972

self.server_address = (any_address,

2003

1973

self.server_address[1])

2004

1974

elif not self.server_address[1]:

2120

2090

return True

2121

2091

2122

2092

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

2222

2093

def string_to_delta(interval):

2223

2094

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

2224

2095

2235

2106

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

2236

2107

datetime.timedelta(0, 330)

2237

2108

"""

2238

2239

try:

2240

return rfc3339_duration_to_delta(interval)

2241

except ValueError:

2242

pass

2243

2244

2109

timevalue = datetime.timedelta(0)

2245

2110

for s in interval.split():

2246

2111

try:

2259

2124

else:

2260

2125

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

2261

2126

.format(suffix))

2262

except IndexError as e:

2127

except (ValueError, IndexError) as e:

2263

2128

raise ValueError(*(e.args))

2264

2129

timevalue += delta

2265

2130

return timevalue

2309

2174

help="Run self-test")

2310

2175

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

2311

2176

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

2312

" to terminal", default=None)

2177

" to terminal")

2313

2178

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

2314

2179

help="Debug level for stdout output")

2315

2180

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

2322

2187

" files")

2323

2188

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

2324

2189

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

2325

" system bus interface", default=None)

2190

" system bus interface")

2326

2191

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

2327

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

2328

default=None)

2192

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

2329

2193

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

2330

2194

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

2331

" state", default=None)

2195

" state")

2332

2196

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

2333

2197

help="Specify a file descriptor to a network"

2334

2198

" socket to use instead of creating one")

2335

2199

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

2336

2200

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

2337

2201

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

2338

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

2202

help="Run in foreground")

2339

2203

2340

2204

options = parser.parse_args()

2341

2205

2350

2214

"port": "",

2351

2215

"debug": "False",

2352

2216

"priority":

2353

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

2217

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

2354

2218

"servicename": "Mandos",

2355

2219

"use_dbus": "True",

2356

2220

"use_ipv6": "True",

2400

2264

for option in server_settings.keys():

2401

2265

if type(server_settings[option]) is str:

2402

2266

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])

2407

2267

# Debug implies foreground

2408

2268

if server_settings["debug"]:

2409

2269

server_settings["foreground"] = True

2457

2317

socketfd=(server_settings["socket"]

2458

2318

or None))

2459

2319

if not foreground:

2460

pidfilename = "/run/mandos.pid"

2461

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

2462

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

2320

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

2463

2321

pidfile = None

2464

2322

try:

2465

2323

pidfile = open(pidfilename, "w")

2482

2340

os.setuid(uid)

2483

2341

except OSError as error:

2484

2342

if error.errno != errno.EPERM:

2485

raise

2343

raise error

2486

2344

2487

2345

if debug:

2488

2346

# Enable all possible GnuTLS debugging

2551

2409

old_client_settings = {}

2552

2410

clients_data = {}

2553

2411

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

2562

2412

# Get client data and settings from last running state.

2563

2413

if server_settings["restore"]:

2564

2414

try:

2580

2430

2581

2431

with PGPEngine() as pgp:

2582

2432

for client_name, client in clients_data.iteritems():

2583

# Skip removed clients

2584

if client_name not in client_settings:

2585

continue

2586

2587

2433

# Decide which value to use after restoring saved state.

2588

2434

# We have three different values: Old config file,

2589

2435

# new config file, and saved state.

2651

2497

# Create all client objects

2652

2498

for client_name, client in clients_data.iteritems():

2653

2499

tcp_server.clients[client_name] = client_class(

2654

name = client_name, settings = client,

2655

server_settings = server_settings)

2500

name = client_name, settings = client)

2656

2501

2657

2502

if not tcp_server.clients:

2658

2503

logger.warning("No clients defined")

2741

2586

service.cleanup()

2742

2587

2743

2588

multiprocessing.active_children()

2744

wnull.close()

2745

2589

if not (tcp_server.clients or client_settings):

2746

2590

return

2747

2591

2759

2603

# A list of attributes that can not be pickled

2760

2604

# + secret.

2761

2605

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

2762

"checker", "server_settings"))

2606

"checker"))

2763

2607

for name, typ in (inspect.getmembers

2764

2608

(dbus.service.Object)):

2765

2609

exclude.add(name)

2793

2637

else:

2794

2638

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

2795

2639

exc_info=e)

2796

raise

2640

raise e

2797

2641

2798

2642

# Delete all clients, and settings from config

2799

2643

while tcp_server.clients: