2 # This module implements a general-purpose server layer for sfa.
3 # The same basic server should be usable on the registry, component, or
6 # TODO: investigate ways to combine this with existing PLC server?
13 from queue import Queue
20 from sfa.util.sfalogging import logger
21 from sfa.util.config import Config
22 from sfa.util.cache import Cache
23 from sfa.trust.certificate import Certificate
24 from sfa.trust.trustedroots import TrustedRoots
26 # don't hard code an api class anymore here
27 from sfa.generic import Generic
30 # Verification callback for pyOpenSSL. We do our own checking of keys because
31 # we have our own authentication spec. Thus we disable several of the normal
32 # prohibitions that OpenSSL places on certificates
35 def verify_callback(conn, x509, err, depth, preverify):
36 # if the cert has been preverified, then it is ok
38 # print " preverified"
41 # the certificate verification done by openssl checks a number of things
42 # that we aren't interested in, so we look out for those error messages
45 # XXX SMBAKER: I don't know what this error is, but it's being returned
46 # xxx thierry: this most likely means the cert
47 # has a validity range in the future
50 # print " X509_V_ERR_CERT_NOT_YET_VALID"
53 # allow self-signed certificates
55 # print " X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT"
58 # allow certs that don't have an issuer
60 # print " X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY"
63 # allow chained certs with self-signed roots
67 # allow certs that are untrusted
69 # print " X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE"
72 # allow certs that are untrusted
74 # print " X509_V_ERR_CERT_UNTRUSTED"
77 # ignore X509_V_ERR_CERT_SIGNATURE_FAILURE
81 logger.debug(" unhandled error %s in verify_callback" % err)
86 # taken from the web (XXX find reference). Implements HTTPS xmlrpc request
89 # python-2.7 http://code.activestate.com/recipes/442473-simple-http-server-supporting-ssl-secure-communica/
90 # python-3.3 https://gist.github.com/ubershmekel/6194556
91 class SecureXMLRpcRequestHandler(xmlrpc.server.SimpleXMLRPCRequestHandler):
93 Secure XML-RPC request handler class.
95 It it very similar to SimpleXMLRPCRequestHandler
96 but it uses HTTPS for transporting XML data.
100 # setup() no longer needed
104 Handles the HTTPS POST request.
106 It was copied out from SimpleXMLRPCServer.py and modified to shutdown
110 peer_cert = Certificate()
111 peer_cert.load_from_pyopenssl_x509(
112 self.connection.getpeercert())
113 generic = Generic.the_flavour()
114 self.api = generic.make_api(peer_cert=peer_cert,
115 interface=self.server.interface,
116 key_file=self.server.key_file,
117 cert_file=self.server.cert_file,
119 # logger.info("SecureXMLRpcRequestHandler.do_POST:")
120 # logger.info("interface=%s"%self.server.interface)
121 # logger.info("key_file=%s"%self.server.key_file)
122 # logger.info("api=%s"%self.api)
123 # logger.info("server=%s"%self.server)
124 # logger.info("handler=%s"%self)
126 request = self.rfile.read(int(self.headers["content-length"]))
128 remote_ip, remote_port) = self.connection.getpeername()
129 self.api.remote_addr = remote_addr
130 response = self.api.handle(
131 remote_addr, request, self.server.method_map)
132 except Exception as fault:
133 # This should only happen if the module is buggy
134 # internal error, report as HTTP server error
135 logger.log_exc("server.do_POST")
136 response = self.api.prepare_response(fault)
137 # self.send_response(500)
140 # avoid session/connection leaks : do this no matter what
142 self.send_response(200)
143 self.send_header("Content-type", "text/xml")
144 self.send_header("Content-length", str(len(response)))
146 self.wfile.write(response.encode())
148 # close db connection
149 self.api.close_dbsession()
150 # shut down the connection
151 self.connection.shutdown(socket.SHUT_RDWR) # Modified here!
154 # Taken from the web (XXX find reference). Implements an HTTPS xmlrpc server
157 class SecureXMLRPCServer(http.server.HTTPServer,
158 xmlrpc.server.SimpleXMLRPCDispatcher):
160 def __init__(self, server_address, HandlerClass,
161 key_file, cert_file, logRequests=True):
163 Secure XML-RPC server.
165 It it very similar to SimpleXMLRPCServer
166 but it uses HTTPS for transporting XML data.
169 f"SecureXMLRPCServer.__init__, server_address={server_address}, "
170 f"cert_file={cert_file}, key_file={key_file}")
171 self.logRequests = logRequests
172 self.interface = None
173 self.key_file = key_file
174 self.cert_file = cert_file
176 # add cache to the request handler
177 HandlerClass.cache = Cache()
178 xmlrpc.server.SimpleXMLRPCDispatcher.__init__(self, True, None)
179 socketserver.BaseServer.__init__(self, server_address, HandlerClass)
180 ssl_context = ssl.create_default_context(purpose=ssl.Purpose.CLIENT_AUTH)
181 ssl_context.load_cert_chain(cert_file, key_file)
182 # If you wanted to verify certs against known CAs..
183 # this is how you would do it
184 # ssl_context.load_verify_locations('/etc/sfa/trusted_roots/plc.gpo.gid')
186 trusted_cert_files = TrustedRoots(
187 config.get_trustedroots_dir()).get_file_list()
189 for cert_file in trusted_cert_files:
190 with open(cert_file) as cafile:
191 cadata += cafile.read()
192 ssl_context.load_verify_locations(cadata=cadata)
193 # ctx.set_verify(SSL.VERIFY_PEER |
194 # SSL.VERIFY_FAIL_IF_NO_PEER_CERT, verify_callback)
195 # ctx.set_verify_depth(5)
196 # ctx.set_app_data(self)
197 # with python3 we use standard library SSLContext.wrap_socket()
198 # instead of an OpenSSL.SSL.Connection object
199 self.socket = ssl_context.wrap_socket(
200 socket.socket(self.address_family, self.socket_type),
203 self.server_activate()
207 # Convert an exception on the server to a full stack trace and send it to
210 def _dispatch(self, method, params):
211 logger.debug("SecureXMLRPCServer._dispatch, method=%s" % method)
213 return xmlrpc.server.SimpleXMLRPCDispatcher._dispatch(
214 self, method, params)
216 # can't use format_exc() as it is not available in jython yet
218 type, value, tb = sys.exc_info()
219 raise xmlrpc.client.Fault(1, ''.join(
220 traceback.format_exception(type, value, tb)))
223 # shutdown_request() no longer needed
226 # From Active State code: http://code.activestate.com/recipes/574454/
227 # This is intended as a drop-in replacement for the ThreadingMixIn class in
228 # module SocketServer of the standard lib. Instead of spawning a new thread
229 # for each request, requests are processed by of pool of reusable threads.
231 class ThreadPoolMixIn(socketserver.ThreadingMixIn):
233 use a thread pool instead of a new thread on every request
235 # XX TODO: Make this configurable
237 # numThreads = config.SFA_SERVER_NUM_THREADS
239 allow_reuse_address = True # seems to fix socket.error on server restart
241 def serve_forever(self):
243 Handle one request at a time until doomsday.
245 # set up the threadpool
246 self.requests = Queue()
248 for _ in range(self.numThreads):
249 thread = threading.Thread(target=self.process_request_thread)
255 self.handle_request()
259 def process_request_thread(self):
261 obtain request from queue instead of directly from server socket
264 socketserver.ThreadingMixIn.process_request_thread(
265 self, *self.requests.get())
267 def handle_request(self):
269 simply collect requests and put them on the queue for the workers.
272 request, client_address = self.get_request()
275 if self.verify_request(request, client_address):
276 self.requests.put((request, client_address))
279 class ThreadedServer(ThreadPoolMixIn, SecureXMLRPCServer):