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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
class Client(object):
def __init__(self, name=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
# self.created = ...
self.last_seen = None
if timeout is None:
timeout = self.server.options.timeout
self.timeout = timeout
if interval == -1:
interval = self.server.options.interval
self.interval = interval
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: Denied permission to bind to interface", \
self.options.interface
else:
raise error
return super(type(self), self).server_bind()
def init_with_options(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)
class udp_handler(SocketServer.DatagramRequestHandler, object):
def handle(self):
self.wfile.write("Polo")
print "UDP request answered"
class IPv6_UDPServer(SocketServer.UDPServer, object):
__init__ = init_with_options
address_family = socket.AF_INET6
allow_reuse_address = True
server_bind = server_bind
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):
__init__ = init_with_options
address_family = socket.AF_INET6
allow_reuse_address = True
request_queue_size = 1024
server_bind = server_bind
in6addr_any = "::"
cred = None
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")
(options, args) = parser.parse_args()
# Parse the time argument
try:
suffix=options.timeout[-1]
value=int(options.timeout[:-1])
if suffix == "d":
options.timeout = datetime.timedelta(value)
elif suffix == "s":
options.timeout = datetime.timedelta(0, value)
elif suffix == "m":
options.timeout = datetime.timedelta(0, 0, 0, 0, value)
elif suffix == "h":
options.timeout = datetime.timedelta(0, 0, 0, 0, 0, value)
elif suffix == "w":
options.timeout = datetime.timedelta(0, 0, 0, 0, 0, 0,
value)
else:
raise ValueError
except (ValueError, IndexError):
parser.error("option --timeout: 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,
**(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:
in_, out, err = select.select((udp_server,
tcp_server), (), ())
for server in in_:
server.handle_request()
if __name__ == "__main__":
main()
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