174
174
def password_encode(self, password):
175
175
# Passphrase can not be empty and can not contain newlines or
176
176
# NUL bytes. So we prefix it and hex encode it.
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"))
177
return b"mandos" + binascii.hexlify(password)
185
179
def encrypt(self, data, password):
186
passphrase = self.password_encode(password)
187
with tempfile.NamedTemporaryFile(dir=self.tempdir
189
passfile.write(passphrase)
191
proc = subprocess.Popen(['gpg', '--symmetric',
195
stdin = subprocess.PIPE,
196
stdout = subprocess.PIPE,
197
stderr = subprocess.PIPE)
198
ciphertext, err = proc.communicate(input = data)
199
if proc.returncode != 0:
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
201
194
return ciphertext
203
196
def decrypt(self, data, password):
204
passphrase = self.password_encode(password)
205
with tempfile.NamedTemporaryFile(dir = self.tempdir
207
passfile.write(passphrase)
209
proc = subprocess.Popen(['gpg', '--decrypt',
213
stdin = subprocess.PIPE,
214
stdout = subprocess.PIPE,
215
stderr = subprocess.PIPE)
216
decrypted_plaintext, err = proc.communicate(input
218
if proc.returncode != 0:
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
220
211
return decrypted_plaintext
456
446
"fingerprint", "host", "interval",
457
447
"last_approval_request", "last_checked_ok",
458
448
"last_enabled", "name", "timeout")
459
client_defaults = { "timeout": "PT5M",
460
"extended_timeout": "PT15M",
449
client_defaults = { "timeout": "5m",
450
"extended_timeout": "15m",
462
452
"checker": "fping -q -- %%(host)s",
464
"approval_delay": "PT0S",
465
"approval_duration": "PT1S",
454
"approval_delay": "0s",
455
"approval_duration": "1s",
466
456
"approved_by_default": "True",
467
457
"enabled": "True",
724
710
# in normal mode, that is already done by daemon(),
725
711
# and in debug mode we don't want to. (Stdin is
726
712
# always replaced by /dev/null.)
727
# The exception is when not debugging but nevertheless
728
# running in the foreground; use the previously
731
if (not self.server_settings["debug"]
732
and self.server_settings["foreground"]):
733
popen_args.update({"stdout": wnull,
735
713
self.checker = subprocess.Popen(command,
739
716
except OSError as error:
740
717
logger.error("Failed to start subprocess",
743
719
self.checker_callback_tag = (gobject.child_watch_add
744
720
(self.checker.pid,
745
721
self.checker_callback,
747
723
# The checker may have completed before the gobject
748
724
# watch was added. Check for this.
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",
725
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
759
727
gobject.source_remove(self.checker_callback_tag)
760
728
self.checker_callback(pid, status, command)
1933
1899
use_ipv6: Boolean; to use IPv6 or not
1935
1901
def __init__(self, server_address, RequestHandlerClass,
1936
interface=None, use_ipv6=True, socketfd=None):
1937
"""If socketfd is set, use that file descriptor instead of
1938
creating a new one with socket.socket().
1902
interface=None, use_ipv6=True):
1940
1903
self.interface = interface
1942
1905
self.address_family = socket.AF_INET6
1943
if socketfd is not None:
1944
# Save the file descriptor
1945
self.socketfd = socketfd
1946
# Save the original socket.socket() function
1947
self.socket_socket = socket.socket
1948
# To implement --socket, we monkey patch socket.socket.
1950
# (When socketserver.TCPServer is a new-style class, we
1951
# could make self.socket into a property instead of monkey
1952
# patching socket.socket.)
1954
# Create a one-time-only replacement for socket.socket()
1955
@functools.wraps(socket.socket)
1956
def socket_wrapper(*args, **kwargs):
1957
# Restore original function so subsequent calls are
1959
socket.socket = self.socket_socket
1960
del self.socket_socket
1961
# This time only, return a new socket object from the
1962
# saved file descriptor.
1963
return socket.fromfd(self.socketfd, *args, **kwargs)
1964
# Replace socket.socket() function with wrapper
1965
socket.socket = socket_wrapper
1966
# The socketserver.TCPServer.__init__ will call
1967
# socket.socket(), which might be our replacement,
1968
# socket_wrapper(), if socketfd was set.
1969
1906
socketserver.TCPServer.__init__(self, server_address,
1970
1907
RequestHandlerClass)
1972
1908
def server_bind(self):
1973
1909
"""This overrides the normal server_bind() function
1974
1910
to bind to an interface if one was specified, and also NOT to
1983
1919
self.socket.setsockopt(socket.SOL_SOCKET,
1984
1920
SO_BINDTODEVICE,
1985
str(self.interface + '\0'))
1986
1923
except socket.error as error:
1987
1924
if error.errno == errno.EPERM:
1988
logger.error("No permission to bind to"
1989
" interface %s", self.interface)
1925
logger.error("No permission to"
1926
" bind to interface %s",
1990
1928
elif error.errno == errno.ENOPROTOOPT:
1991
1929
logger.error("SO_BINDTODEVICE not available;"
1992
1930
" cannot bind to interface %s",
1993
1931
self.interface)
1994
1932
elif error.errno == errno.ENODEV:
1995
logger.error("Interface %s does not exist,"
1996
" cannot bind", self.interface)
1933
logger.error("Interface %s does not"
1934
" exist, cannot bind",
1999
1938
# Only bind(2) the socket if we really need to.
2127
def rfc3339_duration_to_delta(duration):
2128
"""Parse an RFC 3339 "duration" and return a datetime.timedelta
2130
>>> rfc3339_duration_to_delta("P7D")
2131
datetime.timedelta(7)
2132
>>> rfc3339_duration_to_delta("PT60S")
2133
datetime.timedelta(0, 60)
2134
>>> rfc3339_duration_to_delta("PT60M")
2135
datetime.timedelta(0, 3600)
2136
>>> rfc3339_duration_to_delta("PT24H")
2137
datetime.timedelta(1)
2138
>>> rfc3339_duration_to_delta("P1W")
2139
datetime.timedelta(7)
2140
>>> rfc3339_duration_to_delta("PT5M30S")
2141
datetime.timedelta(0, 330)
2142
>>> rfc3339_duration_to_delta("P1DT3M20S")
2143
datetime.timedelta(1, 200)
2146
# Parsing an RFC 3339 duration with regular expressions is not
2147
# possible - there would have to be multiple places for the same
2148
# values, like seconds. The current code, while more esoteric, is
2149
# cleaner without depending on a parsing library. If Python had a
2150
# built-in library for parsing we would use it, but we'd like to
2151
# avoid excessive use of external libraries.
2153
# New type for defining tokens, syntax, and semantics all-in-one
2154
Token = collections.namedtuple("Token",
2155
("regexp", # To match token; if
2156
# "value" is not None,
2157
# must have a "group"
2159
"value", # datetime.timedelta or
2161
"followers")) # Tokens valid after
2163
# RFC 3339 "duration" tokens, syntax, and semantics; taken from
2164
# the "duration" ABNF definition in RFC 3339, Appendix A.
2165
token_end = Token(re.compile(r"$"), None, frozenset())
2166
token_second = Token(re.compile(r"(\d+)S"),
2167
datetime.timedelta(seconds=1),
2168
frozenset((token_end,)))
2169
token_minute = Token(re.compile(r"(\d+)M"),
2170
datetime.timedelta(minutes=1),
2171
frozenset((token_second, token_end)))
2172
token_hour = Token(re.compile(r"(\d+)H"),
2173
datetime.timedelta(hours=1),
2174
frozenset((token_minute, token_end)))
2175
token_time = Token(re.compile(r"T"),
2177
frozenset((token_hour, token_minute,
2179
token_day = Token(re.compile(r"(\d+)D"),
2180
datetime.timedelta(days=1),
2181
frozenset((token_time, token_end)))
2182
token_month = Token(re.compile(r"(\d+)M"),
2183
datetime.timedelta(weeks=4),
2184
frozenset((token_day, token_end)))
2185
token_year = Token(re.compile(r"(\d+)Y"),
2186
datetime.timedelta(weeks=52),
2187
frozenset((token_month, token_end)))
2188
token_week = Token(re.compile(r"(\d+)W"),
2189
datetime.timedelta(weeks=1),
2190
frozenset((token_end,)))
2191
token_duration = Token(re.compile(r"P"), None,
2192
frozenset((token_year, token_month,
2193
token_day, token_time,
2195
# Define starting values
2196
value = datetime.timedelta() # Value so far
2198
followers = frozenset(token_duration,) # Following valid tokens
2199
s = duration # String left to parse
2200
# Loop until end token is found
2201
while found_token is not token_end:
2202
# Search for any currently valid tokens
2203
for token in followers:
2204
match = token.regexp.match(s)
2205
if match is not None:
2207
if token.value is not None:
2208
# Value found, parse digits
2209
factor = int(match.group(1), 10)
2210
# Add to value so far
2211
value += factor * token.value
2212
# Strip token from string
2213
s = token.regexp.sub("", s, 1)
2216
# Set valid next tokens
2217
followers = found_token.followers
2220
# No currently valid tokens were found
2221
raise ValueError("Invalid RFC 3339 duration")
2226
2065
def string_to_delta(interval):
2227
2066
"""Parse a string and return a datetime.timedelta
2327
2160
parser.add_argument("--no-dbus", action="store_false",
2328
2161
dest="use_dbus", help="Do not provide D-Bus"
2329
" system bus interface", default=None)
2162
" system bus interface")
2330
2163
parser.add_argument("--no-ipv6", action="store_false",
2331
dest="use_ipv6", help="Do not use IPv6",
2164
dest="use_ipv6", help="Do not use IPv6")
2333
2165
parser.add_argument("--no-restore", action="store_false",
2334
2166
dest="restore", help="Do not restore stored"
2335
" state", default=None)
2336
parser.add_argument("--socket", type=int,
2337
help="Specify a file descriptor to a network"
2338
" socket to use instead of creating one")
2339
2168
parser.add_argument("--statedir", metavar="DIR",
2340
2169
help="Directory to save/restore state in")
2341
parser.add_argument("--foreground", action="store_true",
2342
help="Run in foreground", default=None)
2344
2171
options = parser.parse_args()
2346
2173
if options.check:
2348
fail_count, test_count = doctest.testmod()
2349
sys.exit(os.EX_OK if fail_count == 0 else 1)
2351
2178
# Default values for config file for server-global settings
2352
2179
server_defaults = { "interface": "",
2373
2198
# Convert the SafeConfigParser object to a dict
2374
2199
server_settings = server_config.defaults()
2375
2200
# Use the appropriate methods on the non-string config options
2376
for option in ("debug", "use_dbus", "use_ipv6", "foreground"):
2201
for option in ("debug", "use_dbus", "use_ipv6"):
2377
2202
server_settings[option] = server_config.getboolean("DEFAULT",
2379
2204
if server_settings["port"]:
2380
2205
server_settings["port"] = server_config.getint("DEFAULT",
2382
if server_settings["socket"]:
2383
server_settings["socket"] = server_config.getint("DEFAULT",
2385
# Later, stdin will, and stdout and stderr might, be dup'ed
2386
# over with an opened os.devnull. But we don't want this to
2387
# happen with a supplied network socket.
2388
if 0 <= server_settings["socket"] <= 2:
2389
server_settings["socket"] = os.dup(server_settings
2391
2207
del server_config
2393
2209
# Override the settings from the config file with command line
2655
2444
# Create all client objects
2656
2445
for client_name, client in clients_data.iteritems():
2657
2446
tcp_server.clients[client_name] = client_class(
2658
name = client_name, settings = client,
2659
server_settings = server_settings)
2447
name = client_name, settings = client)
2661
2449
if not tcp_server.clients:
2662
2450
logger.warning("No clients defined")
2665
if pidfile is not None:
2669
pidfile.write(str(pid) + "\n".encode("utf-8"))
2671
logger.error("Could not write to file %r with PID %d",
2456
pidfile.write(str(pid) + "\n".encode("utf-8"))
2459
logger.error("Could not write to file %r with PID %d",
2462
# "pidfile" was never created
2674
2464
del pidfilename
2676
2466
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())