/mandos/release

To get this branch, use:
bzr branch http://bzr.recompile.se/loggerhead/mandos/release
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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()