1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
#!/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
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
self.created = datetime.datetime.now()
self.last_seen = None
if timeout is None:
timeout = options.timeout
self.timeout = timeout
if interval == -1:
interval = options.interval
self.interval = interval
self.next_check = datetime.datetime.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 = "::"
cred = None
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:
in_, out, err = select.select((udp_server,
tcp_server), (), ())
for server in in_:
server.handle_request()
if __name__ == "__main__":
main()
|