def dtls(nssfile_path, certs_path, certs_name):
sck = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sck.bind(("0.0.0.0", 4433))
# Windows
scn = SSLConnection(sck,
keyfile="{}{}.key".format(certs_path, certs_name),
certfile="{}{}.pem".format(certs_path, certs_name),
server_side=True,
ca_certs="{}{}.ca".format(certs_path, certs_name),
do_handshake_on_connect=False,
cb_user_config_ssl_ctx=ssl_ctx_cb)
while True:
peer_address = scn.listen()
act = scn.accept()
if act:
conn = act[0]
z = threading.Thread(target=readdtls, args=[conn, nssfile_path])
z.start()
def main():
sck = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sck.bind(("127.0.0.1", 28000))
sck.settimeout(30)
cert_path = path.join(path.abspath(path.dirname(__file__)), "certs")
scn = SSLConnection(sck,
keyfile=path.join(cert_path, "keycert.pem"),
certfile=path.join(cert_path, "keycert.pem"),
server_side=True,
ca_certs=path.join(cert_path, "ca-cert.pem"),
do_handshake_on_connect=False)
cnt = 0
while True:
cnt += 1
print "Listen invocation: %d" % cnt
peer_address = scn.listen()
if peer_address:
print "Completed listening for peer: %s" % str(peer_address)
break
print "Accepting..."
conn = scn.accept()[0]
sck.settimeout(5)
conn.get_socket(True).settimeout(5)
cnt = 0
while True:
cnt += 1
print "Listen invocation: %d" % cnt
peer_address = scn.listen()
assert not peer_address
print "Handshake invocation: %d" % cnt
try:
conn.do_handshake()
except SSLError as err:
if err.errno == 504:
continue
raise
print "Completed handshaking with peer"
break
cnt = 0
while True:
cnt += 1
print "Listen invocation: %d" % cnt
peer_address = scn.listen()
assert not peer_address
print "Read invocation: %d" % cnt
try:
message = conn.read()
except SSLError as err:
if err.errno == 502:
continue
if err.args[0] == SSL_ERROR_ZERO_RETURN:
break
raise
print message
conn.write("Back to you: " + message)
cnt = 0
while True:
cnt += 1
print "Listen invocation: %d" % cnt
peer_address = scn.listen()
assert not peer_address
print "Shutdown invocation: %d" % cnt
try:
s = conn.shutdown()
s.shutdown(socket.SHUT_RDWR)
except SSLError as err:
if err.errno == 502:
continue
raise
break
def main():
sck = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sck.bind(("127.0.0.1", 28000))
sck.settimeout(30)
cert_path = path.join(path.abspath(path.dirname(__file__)), "certs")
scn = SSLConnection(
sck,
keyfile=path.join(cert_path, "keycert.pem"),
certfile=path.join(cert_path, "keycert.pem"),
server_side=True,
ca_certs=path.join(cert_path, "ca-cert.pem"),
do_handshake_on_connect=False)
cnt = 0
while True:
cnt += 1
print "Listen invocation: %d" % cnt
peer_address = scn.listen()
if peer_address:
print "Completed listening for peer: %s" % str(peer_address)
break
print "Accepting..."
conn = scn.accept()[0]
sck.settimeout(5)
conn.get_socket(True).settimeout(5)
cnt = 0
while True:
cnt += 1
print "Listen invocation: %d" % cnt
peer_address = scn.listen()
assert not peer_address
print "Handshake invocation: %d" % cnt
try:
conn.do_handshake()
except SSLError as err:
if err.errno == 504:
continue
raise
print "Completed handshaking with peer"
break
cnt = 0
while True:
cnt += 1
print "Listen invocation: %d" % cnt
peer_address = scn.listen()
assert not peer_address
print "Read invocation: %d" % cnt
try:
message = conn.read()
except SSLError as err:
if err.errno == 502:
continue
if err.args[0] == SSL_ERROR_ZERO_RETURN:
break
raise
print message
conn.write("Back to you: " + message)
cnt = 0
while True:
cnt += 1
print "Listen invocation: %d" % cnt
peer_address = scn.listen()
assert not peer_address
print "Shutdown invocation: %d" % cnt
try:
s = conn.shutdown()
s.shutdown(socket.SHUT_RDWR)
except SSLError as err:
if err.errno == 502:
continue
raise
break
class DtlsServer(DatagramServer):
"""DtlsServer extends the Gevent DatagramServer with DTLS support"""
def __init__(self,
listener,
handle=None,
backlog=None,
spawn='default',
**ssl_args):
"""Initializes the Server
Calls init_socket()
:param listener: Tuple (address, port) used by the server
:param handle: function called when application data is recieved
:param ssl_args: contains two keywords: "keyfile" and "certfile"
containing paths to respective files
"""
DatagramServer.__init__(self, listener, handle=handle, spawn=spawn)
self.backlog = backlog
self.ssl_args = ssl_args
def init_socket(self):
"""Initalizes listening socket and SSL Connection"""
if not hasattr(self, 'socket'):
self.socket = self.get_listener(self.address, self.backlog,
self.family)
self.address = self.socket.getsockname()
self._handle = self.handle
self._socket = self.socket
self.scn = SSLConnection(self._socket,
keyfile=self.ssl_args["keyfile"],
certfile=self.ssl_args["certfile"],
ca_certs=self.ssl_args["certfile"],
server_side=True,
do_handshake_on_connect=False)
@classmethod
def get_listener(cls, address, backlog=None, family=None):
"""Creates a datagram socket used to listen to incoming requests"""
return _udp_socket(address, reuse_addr=cls.reuse_addr, family=family)
def sendto(self, buff, remote):
"""Overwrites the DatagramServer sendto in order to send an encrypted
reply
:param buff: Byte buffer to be encrypted and sent
:param remote: Unused parameter, since an SSL connection exists
"""
self.conn.write(buff)
def do_handshake(self, remote):
"""Performs the DTLS handshake before recieving data.
Calls the message handler with tuple(data buffer, tuple(client IP,
client Port))
:param remote: tuple(client IP, client Port)
"""
# TODO: Error handling: send something in case of SSL socket timeout
# Accepting
self.conn = self.scn.accept()[0]
self.conn.get_socket(True).settimeout(5)
# Handshake
self.conn.do_handshake()
# Reading the CoAP message
message = self.conn.read()
self._handle(message, remote)
def do_read(self):
"""Overwrites the DatagramServer do_read in order to perform the DTLS
handshake before receiving data.
This function is triggered automatically by the DatagramServer when an
I/O operation is detected.
"""
peer_address = self.scn.listen()
if peer_address:
# FIXME: need to join these on stop()
Greenlet.spawn(self.do_handshake, peer_address)