174
172
def password_encode(self, password):
175
173
# Passphrase can not be empty and can not contain newlines or
176
174
# NUL bytes. So we prefix it and hex encode it.
177
return b"mandos" + binascii.hexlify(password)
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"))
179
183
def encrypt(self, data, password):
180
self.gnupg.passphrase = self.password_encode(password)
181
with open(os.devnull, "w") as devnull:
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:
188
with contextlib.closing(proc.handles['stdout']) as f:
189
ciphertext = f.read()
193
self.gnupg.passphrase = None
184
passphrase = self.password_encode(password)
185
with tempfile.NamedTemporaryFile(dir=self.tempdir
187
passfile.write(passphrase)
189
proc = subprocess.Popen(['gpg', '--symmetric',
193
stdin = subprocess.PIPE,
194
stdout = subprocess.PIPE,
195
stderr = subprocess.PIPE)
196
ciphertext, err = proc.communicate(input = data)
197
if proc.returncode != 0:
194
199
return ciphertext
196
201
def decrypt(self, data, password):
197
self.gnupg.passphrase = self.password_encode(password)
198
with open(os.devnull, "w") as devnull:
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:
205
with contextlib.closing(proc.handles['stdout']) as f:
206
decrypted_plaintext = f.read()
210
self.gnupg.passphrase = None
202
passphrase = self.password_encode(password)
203
with tempfile.NamedTemporaryFile(dir = self.tempdir
205
passfile.write(passphrase)
207
proc = subprocess.Popen(['gpg', '--decrypt',
211
stdin = subprocess.PIPE,
212
stdout = subprocess.PIPE,
213
stderr = subprocess.PIPE)
214
decrypted_plaintext, err = proc.communicate(input
216
if proc.returncode != 0:
211
218
return decrypted_plaintext
439
446
runtime_expansions: Allowed attributes for runtime expansion.
440
447
expires: datetime.datetime(); time (UTC) when a client will be
441
448
disabled, or None
449
server_settings: The server_settings dict from main()
444
452
runtime_expansions = ("approval_delay", "approval_duration",
445
"created", "enabled", "fingerprint",
446
"host", "interval", "last_checked_ok",
453
"created", "enabled", "expires",
454
"fingerprint", "host", "interval",
455
"last_approval_request", "last_checked_ok",
447
456
"last_enabled", "name", "timeout")
448
client_defaults = { "timeout": "5m",
449
"extended_timeout": "15m",
457
client_defaults = { "timeout": "PT5M",
458
"extended_timeout": "PT15M",
451
460
"checker": "fping -q -- %%(host)s",
453
"approval_delay": "0s",
454
"approval_duration": "1s",
462
"approval_delay": "PT0S",
463
"approval_duration": "PT1S",
455
464
"approved_by_default": "True",
456
465
"enabled": "True",
709
721
# in normal mode, that is already done by daemon(),
710
722
# and in debug mode we don't want to. (Stdin is
711
723
# always replaced by /dev/null.)
724
# The exception is when not debugging but nevertheless
725
# running in the foreground; use the previously
728
if (not self.server_settings["debug"]
729
and self.server_settings["foreground"]):
730
popen_args.update({"stdout": wnull,
712
732
self.checker = subprocess.Popen(command,
715
736
except OSError as error:
716
737
logger.error("Failed to start subprocess",
718
740
self.checker_callback_tag = (gobject.child_watch_add
719
741
(self.checker.pid,
720
742
self.checker_callback,
722
744
# The checker may have completed before the gobject
723
745
# watch was added. Check for this.
724
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
747
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
748
except OSError as error:
749
if error.errno == errno.ECHILD:
750
# This should never happen
751
logger.error("Child process vanished",
726
756
gobject.source_remove(self.checker_callback_tag)
727
757
self.checker_callback(pid, status, command)
1898
1928
use_ipv6: Boolean; to use IPv6 or not
1900
1930
def __init__(self, server_address, RequestHandlerClass,
1901
interface=None, use_ipv6=True):
1931
interface=None, use_ipv6=True, socketfd=None):
1932
"""If socketfd is set, use that file descriptor instead of
1933
creating a new one with socket.socket().
1902
1935
self.interface = interface
1904
1937
self.address_family = socket.AF_INET6
1938
if socketfd is not None:
1939
# Save the file descriptor
1940
self.socketfd = socketfd
1941
# Save the original socket.socket() function
1942
self.socket_socket = socket.socket
1943
# To implement --socket, we monkey patch socket.socket.
1945
# (When socketserver.TCPServer is a new-style class, we
1946
# could make self.socket into a property instead of monkey
1947
# patching socket.socket.)
1949
# Create a one-time-only replacement for socket.socket()
1950
@functools.wraps(socket.socket)
1951
def socket_wrapper(*args, **kwargs):
1952
# Restore original function so subsequent calls are
1954
socket.socket = self.socket_socket
1955
del self.socket_socket
1956
# This time only, return a new socket object from the
1957
# saved file descriptor.
1958
return socket.fromfd(self.socketfd, *args, **kwargs)
1959
# Replace socket.socket() function with wrapper
1960
socket.socket = socket_wrapper
1961
# The socketserver.TCPServer.__init__ will call
1962
# socket.socket(), which might be our replacement,
1963
# socket_wrapper(), if socketfd was set.
1905
1964
socketserver.TCPServer.__init__(self, server_address,
1906
1965
RequestHandlerClass)
1907
1967
def server_bind(self):
1908
1968
"""This overrides the normal server_bind() function
1909
1969
to bind to an interface if one was specified, and also NOT to
1918
1978
self.socket.setsockopt(socket.SOL_SOCKET,
1919
1979
SO_BINDTODEVICE,
1980
str(self.interface + '\0'))
1922
1981
except socket.error as error:
1923
1982
if error.errno == errno.EPERM:
1924
logger.error("No permission to"
1925
" bind to interface %s",
1983
logger.error("No permission to bind to"
1984
" interface %s", self.interface)
1927
1985
elif error.errno == errno.ENOPROTOOPT:
1928
1986
logger.error("SO_BINDTODEVICE not available;"
1929
1987
" cannot bind to interface %s",
1930
1988
self.interface)
1931
1989
elif error.errno == errno.ENODEV:
1932
logger.error("Interface %s does not"
1933
" exist, cannot bind",
1990
logger.error("Interface %s does not exist,"
1991
" cannot bind", self.interface)
1937
1994
# Only bind(2) the socket if we really need to.
2122
def rfc3339_duration_to_delta(duration):
2123
"""Parse an RFC 3339 "duration" and return a datetime.timedelta
2125
>>> rfc3339_duration_to_delta("P7D")
2126
datetime.timedelta(7)
2127
>>> rfc3339_duration_to_delta("PT60S")
2128
datetime.timedelta(0, 60)
2129
>>> rfc3339_duration_to_delta("PT60M")
2130
datetime.timedelta(0, 3600)
2131
>>> rfc3339_duration_to_delta("PT24H")
2132
datetime.timedelta(1)
2133
>>> rfc3339_duration_to_delta("P1W")
2134
datetime.timedelta(7)
2135
>>> rfc3339_duration_to_delta("PT5M30S")
2136
datetime.timedelta(0, 330)
2137
>>> rfc3339_duration_to_delta("P1DT3M20S")
2138
datetime.timedelta(1, 200)
2141
# Parsing an RFC 3339 duration with regular expressions is not
2142
# possible - there would have to be multiple places for the same
2143
# values, like seconds. The current code, while more esoteric, is
2144
# cleaner without depending on a parsing library. If Python had a
2145
# built-in library for parsing we would use it, but we'd like to
2146
# avoid excessive use of external libraries.
2148
# New type for defining tokens, syntax, and semantics all-in-one
2149
Token = collections.namedtuple("Token",
2150
("regexp", # To match token; if
2151
# "value" is not None,
2152
# must have a "group"
2154
"value", # datetime.timedelta or
2156
"followers")) # Tokens valid after
2158
# RFC 3339 "duration" tokens, syntax, and semantics; taken from
2159
# the "duration" ABNF definition in RFC 3339, Appendix A.
2160
token_end = Token(re.compile(r"$"), None, frozenset())
2161
token_second = Token(re.compile(r"(\d+)S"),
2162
datetime.timedelta(seconds=1),
2163
frozenset((token_end,)))
2164
token_minute = Token(re.compile(r"(\d+)M"),
2165
datetime.timedelta(minutes=1),
2166
frozenset((token_second, token_end)))
2167
token_hour = Token(re.compile(r"(\d+)H"),
2168
datetime.timedelta(hours=1),
2169
frozenset((token_minute, token_end)))
2170
token_time = Token(re.compile(r"T"),
2172
frozenset((token_hour, token_minute,
2174
token_day = Token(re.compile(r"(\d+)D"),
2175
datetime.timedelta(days=1),
2176
frozenset((token_time, token_end)))
2177
token_month = Token(re.compile(r"(\d+)M"),
2178
datetime.timedelta(weeks=4),
2179
frozenset((token_day, token_end)))
2180
token_year = Token(re.compile(r"(\d+)Y"),
2181
datetime.timedelta(weeks=52),
2182
frozenset((token_month, token_end)))
2183
token_week = Token(re.compile(r"(\d+)W"),
2184
datetime.timedelta(weeks=1),
2185
frozenset((token_end,)))
2186
token_duration = Token(re.compile(r"P"), None,
2187
frozenset((token_year, token_month,
2188
token_day, token_time,
2190
# Define starting values
2191
value = datetime.timedelta() # Value so far
2193
followers = frozenset(token_duration,) # Following valid tokens
2194
s = duration # String left to parse
2195
# Loop until end token is found
2196
while found_token is not token_end:
2197
# Search for any currently valid tokens
2198
for token in followers:
2199
match = token.regexp.match(s)
2200
if match is not None:
2202
if token.value is not None:
2203
# Value found, parse digits
2204
factor = int(match.group(1), 10)
2205
# Add to value so far
2206
value += factor * token.value
2207
# Strip token from string
2208
s = token.regexp.sub("", s, 1)
2211
# Set valid next tokens
2212
followers = found_token.followers
2215
# No currently valid tokens were found
2216
raise ValueError("Invalid RFC 3339 duration")
2064
2221
def string_to_delta(interval):
2065
2222
"""Parse a string and return a datetime.timedelta
2159
2322
parser.add_argument("--no-dbus", action="store_false",
2160
2323
dest="use_dbus", help="Do not provide D-Bus"
2161
" system bus interface")
2324
" system bus interface", default=None)
2162
2325
parser.add_argument("--no-ipv6", action="store_false",
2163
dest="use_ipv6", help="Do not use IPv6")
2326
dest="use_ipv6", help="Do not use IPv6",
2164
2328
parser.add_argument("--no-restore", action="store_false",
2165
2329
dest="restore", help="Do not restore stored"
2330
" state", default=None)
2331
parser.add_argument("--socket", type=int,
2332
help="Specify a file descriptor to a network"
2333
" socket to use instead of creating one")
2167
2334
parser.add_argument("--statedir", metavar="DIR",
2168
2335
help="Directory to save/restore state in")
2336
parser.add_argument("--foreground", action="store_true",
2337
help="Run in foreground", default=None)
2170
2339
options = parser.parse_args()
2197
2368
# Convert the SafeConfigParser object to a dict
2198
2369
server_settings = server_config.defaults()
2199
2370
# Use the appropriate methods on the non-string config options
2200
for option in ("debug", "use_dbus", "use_ipv6"):
2371
for option in ("debug", "use_dbus", "use_ipv6", "foreground"):
2201
2372
server_settings[option] = server_config.getboolean("DEFAULT",
2203
2374
if server_settings["port"]:
2204
2375
server_settings["port"] = server_config.getint("DEFAULT",
2377
if server_settings["socket"]:
2378
server_settings["socket"] = server_config.getint("DEFAULT",
2380
# Later, stdin will, and stdout and stderr might, be dup'ed
2381
# over with an opened os.devnull. But we don't want this to
2382
# happen with a supplied network socket.
2383
if 0 <= server_settings["socket"] <= 2:
2384
server_settings["socket"] = os.dup(server_settings
2206
2386
del server_config
2208
2388
# Override the settings from the config file with command line
2443
2648
# Create all client objects
2444
2649
for client_name, client in clients_data.iteritems():
2445
2650
tcp_server.clients[client_name] = client_class(
2446
name = client_name, settings = client)
2651
name = client_name, settings = client,
2652
server_settings = server_settings)
2448
2654
if not tcp_server.clients:
2449
2655
logger.warning("No clients defined")
2455
pidfile.write(str(pid) + "\n".encode("utf-8"))
2458
logger.error("Could not write to file %r with PID %d",
2461
# "pidfile" was never created
2658
if pidfile is not None:
2662
pidfile.write(str(pid) + "\n".encode("utf-8"))
2664
logger.error("Could not write to file %r with PID %d",
2463
2667
del pidfilename
2464
signal.signal(signal.SIGINT, signal.SIG_IGN)
2466
2669
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
2467
2670
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())