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#!/usr/bin/python
import SocketServer
import socket
import select
from optparse import OptionParser
import datetime
import errno
import gnutls.crypto
import gnutls.connection
import gnutls.errors
import ConfigParser
import sys
import re
import os
import signal
class Client(object):
def __init__(self, name=None, options=None, dn=None,
password=None, passfile=None, fqdn=None,
timeout=None, interval=-1):
self.name = name
self.dn = dn
if password:
self.password = password
elif passfile:
self.password = open(passfile).readall()
else:
print "No Password or Passfile in client config file"
# raise RuntimeError XXX
self.password = "gazonk"
self.fqdn = fqdn # string
self.created = datetime.datetime.now()
self.last_seen = None # datetime.datetime()
if timeout is None:
timeout = options.timeout
self.timeout = timeout # datetime.timedelta()
if interval == -1:
interval = options.interval
self.interval = interval # datetime.timedelta()
self.next_check = datetime.datetime.now() # datetime.datetime()
self.checker = None # or a subprocess.Popen()
def check_action(self, now=None):
"""The checker said something and might have completed.
Check if is has, and take appropriate actions."""
if self.checker.poll() is None:
# False alarm, no result yet
#self.checker.read()
return
if now is None:
now = datetime.datetime.now()
if self.checker.returncode == 0:
self.last_seen = now
while self.next_check <= now:
self.next_check += self.interval
handle_request = check_action
def start_checker(self):
self.stop_checker()
try:
self.checker = subprocess.Popen("sleep 1; fping -q -- %s"
% re.escape(self.fqdn),
stdout=subprocess.PIPE,
close_fds=True,
shell=True, cwd="/")
except subprocess.OSError, e:
print "Failed to start subprocess:", e
def stop_checker(self):
if self.checker is None:
return
os.kill(self.checker.pid, signal.SIGTERM)
if self.checker.poll() is None:
os.kill(self.checker.pid, signal.SIGKILL)
self.checker = None
__del__ = stop_checker
def fileno(self):
if self.checker is None:
return None
return self.checker.stdout.fileno()
def next_stop(self):
"""The time when something must be done about this client"""
return min(self.last_seen + self.timeout, self.next_check)
def still_valid(self, now=None):
"""Has this client's timeout not passed?"""
if now is None:
now = datetime.datetime.now()
return now < (self.last_seen + timeout)
def it_is_time_to_check(self, now=None):
if now is None:
now = datetime.datetime.now()
return self.next_check <= now
class server_metaclass(type):
"Common behavior for the UDP and TCP server classes"
def __new__(cls, name, bases, attrs):
attrs["address_family"] = socket.AF_INET6
attrs["allow_reuse_address"] = True
def server_bind(self):
if self.options.interface:
if not hasattr(socket, "SO_BINDTODEVICE"):
# From /usr/include/asm-i486/socket.h
socket.SO_BINDTODEVICE = 25
try:
self.socket.setsockopt(socket.SOL_SOCKET,
socket.SO_BINDTODEVICE,
self.options.interface)
except socket.error, error:
if error[0] == errno.EPERM:
print "Warning: No permission to bind to interface", \
self.options.interface
else:
raise error
return super(type(self), self).server_bind()
attrs["server_bind"] = server_bind
def init(self, *args, **kwargs):
if "options" in kwargs:
self.options = kwargs["options"]
del kwargs["options"]
if "clients" in kwargs:
self.clients = kwargs["clients"]
del kwargs["clients"]
if "credentials" in kwargs:
self.credentials = kwargs["credentials"]
del kwargs["credentials"]
return super(type(self), self).__init__(*args, **kwargs)
attrs["__init__"] = init
return type.__new__(cls, name, bases, attrs)
class udp_handler(SocketServer.DatagramRequestHandler, object):
def handle(self):
self.wfile.write("Polo")
print "UDP request answered"
class IPv6_UDPServer(SocketServer.UDPServer, object):
__metaclass__ = server_metaclass
def verify_request(self, request, client_address):
print "UDP request came"
return request[0] == "Marco"
class tcp_handler(SocketServer.BaseRequestHandler, object):
def handle(self):
print "TCP request came"
print "Request:", self.request
print "Client Address:", self.client_address
print "Server:", self.server
session = gnutls.connection.ServerSession(self.request,
self.server.credentials)
session.handshake()
if session.peer_certificate:
print "DN:", session.peer_certificate.subject
try:
session.verify_peer()
except gnutls.errors.CertificateError, error:
print "Verify failed", error
session.bye()
return
try:
session.send(dict((client.dn, client.password)
for client in self.server.clients)
[session.peer_certificate.subject])
except KeyError:
session.send("gazonk")
# Log maybe? XXX
session.bye()
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
__metaclass__ = server_metaclass
request_queue_size = 1024
in6addr_any = "::"
def string_to_delta(interval):
"""Parse a string and return a datetime.timedelta
>>> string_to_delta('7d')
datetime.timedelta(7)
>>> string_to_delta('60s')
datetime.timedelta(0, 60)
>>> string_to_delta('60m')
datetime.timedelta(0, 3600)
>>> string_to_delta('24h')
datetime.timedelta(1)
>>> string_to_delta(u'1w')
datetime.timedelta(7)
"""
try:
suffix=unicode(interval[-1])
value=int(interval[:-1])
if suffix == u"d":
delta = datetime.timedelta(value)
elif suffix == u"s":
delta = datetime.timedelta(0, value)
elif suffix == u"m":
delta = datetime.timedelta(0, 0, 0, 0, value)
elif suffix == u"h":
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
elif suffix == u"w":
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
else:
raise ValueError
except (ValueError, IndexError):
raise ValueError
return delta
def main():
parser = OptionParser()
parser.add_option("-i", "--interface", type="string",
default="eth0", metavar="IF",
help="Interface to bind to")
parser.add_option("--cert", type="string", default="cert.pem",
metavar="FILE",
help="Public key certificate to use")
parser.add_option("--key", type="string", default="key.pem",
metavar="FILE",
help="Private key to use")
parser.add_option("--ca", type="string", default="ca.pem",
metavar="FILE",
help="Certificate Authority certificate to use")
parser.add_option("--crl", type="string", default="crl.pem",
metavar="FILE",
help="Certificate Revokation List to use")
parser.add_option("-p", "--port", type="int", default=49001,
help="Port number to receive requests on")
parser.add_option("--dh", type="int", metavar="BITS",
help="DH group to use")
parser.add_option("-t", "--timeout", type="string", # Parsed later
default="15m",
help="Amount of downtime allowed for clients")
parser.add_option("--interval", type="string", # Parsed later
default="5m",
help="How often to check that a client is up")
parser.add_option("--check", action="store_true", default=False,
help="Run self-test")
(options, args) = parser.parse_args()
if options.check:
import doctest
doctest.testmod()
sys.exit()
# Parse the time arguments
try:
options.timeout = string_to_delta(options.timeout)
except ValueError:
parser.error("option --timeout: Unparseable time")
try:
options.interval = string_to_delta(options.interval)
except ValueError:
parser.error("option --interval: Unparseable time")
cert = gnutls.crypto.X509Certificate(open(options.cert).read())
key = gnutls.crypto.X509PrivateKey(open(options.key).read())
ca = gnutls.crypto.X509Certificate(open(options.ca).read())
crl = gnutls.crypto.X509CRL(open(options.crl).read())
cred = gnutls.connection.X509Credentials(cert, key, [ca], [crl])
# Parse config file
defaults = {}
client_config_object = ConfigParser.SafeConfigParser(defaults)
client_config_object.read("mandos-clients.conf")
clients = [Client(name=section, options=options,
**(dict(client_config_object.items(section))))
for section in client_config_object.sections()]
udp_server = IPv6_UDPServer((in6addr_any, options.port),
udp_handler,
options=options)
tcp_server = IPv6_TCPServer((in6addr_any, options.port),
tcp_handler,
options=options,
clients=clients,
credentials=cred)
while True:
try:
input, out, err = select.select((udp_server,
tcp_server), (), ())
if not input:
pass
else:
for obj in input:
obj.handle_request()
except KeyboardInterrupt:
break
# Cleanup here
for client in clients:
client.stop_checker()
if __name__ == "__main__":
main()
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