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?
18 import SimpleHTTPServer
19 import SimpleXMLRPCServer
20 from OpenSSL import SSL
21 from Queue import Queue
23 #import sfa.util.sfalogging
24 from sfa.trust.certificate import Keypair, Certificate
25 from sfa.trust.credential import *
26 from sfa.util.faults import *
27 from sfa.plc.api import SfaAPI
28 from sfa.util.cache import Cache
29 #from sfa.util.debug import log
31 # Verification callback for pyOpenSSL. We do our own checking of keys because
32 # we have our own authentication spec. Thus we disable several of the normal
33 # 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
42 # the certificate verification done by openssl checks a number of things
43 # that we aren't interested in, so we look out for those error messages
46 # XXX SMBAKER: I don't know what this error is, but it's being returned
49 #print " X509_V_ERR_CERT_NOT_YET_VALID"
52 # allow self-signed certificates
54 #print " X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT"
57 # allow certs that don't have an issuer
59 #print " X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY"
62 # allow chained certs with self-signed roots
66 # allow certs that are untrusted
68 #print " X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE"
71 # allow certs that are untrusted
73 #print " X509_V_ERR_CERT_UNTRUSTED"
76 print " error", err, "in verify_callback"
81 # taken from the web (XXX find reference). Implents HTTPS xmlrpc request handler
82 class SecureXMLRpcRequestHandler(SimpleXMLRPCServer.SimpleXMLRPCRequestHandler):
83 """Secure XML-RPC request handler class.
85 It it very similar to SimpleXMLRPCRequestHandler but it uses HTTPS for transporting XML data.
88 self.connection = self.request
89 self.rfile = socket._fileobject(self.request, "rb", self.rbufsize)
90 self.wfile = socket._fileobject(self.request, "wb", self.wbufsize)
93 """Handles the HTTPS POST request.
95 It was copied out from SimpleXMLRPCServer.py and modified to shutdown
99 peer_cert = Certificate()
100 peer_cert.load_from_pyopenssl_x509(self.connection.get_peer_certificate())
101 self.api = SfaAPI(peer_cert = peer_cert,
102 interface = self.server.interface,
103 key_file = self.server.key_file,
104 cert_file = self.server.cert_file,
107 request = self.rfile.read(int(self.headers["content-length"]))
108 remote_addr = (remote_ip, remote_port) = self.connection.getpeername()
109 self.api.remote_addr = remote_addr
110 response = self.api.handle(remote_addr, request, self.server.method_map)
111 except Exception, fault:
112 # This should only happen if the module is buggy
113 # internal error, report as HTTP server error
114 traceback.print_exc()
115 response = self.api.prepare_response(fault)
116 #self.send_response(500)
119 # got a valid response
120 self.send_response(200)
121 self.send_header("Content-type", "text/xml")
122 self.send_header("Content-length", str(len(response)))
124 self.wfile.write(response)
126 # shut down the connection
128 self.connection.shutdown() # Modified here!
131 # Taken from the web (XXX find reference). Implements an HTTPS xmlrpc server
132 class SecureXMLRPCServer(BaseHTTPServer.HTTPServer,SimpleXMLRPCServer.SimpleXMLRPCDispatcher):
133 def __init__(self, server_address, HandlerClass, key_file, cert_file, logRequests=True):
134 """Secure XML-RPC server.
136 It it very similar to SimpleXMLRPCServer but it uses HTTPS for transporting XML data.
138 self.logRequests = logRequests
139 self.interface = None
140 self.key_file = key_file
141 self.cert_file = cert_file
143 # add cache to the request handler
144 HandlerClass.cache = Cache()
145 #for compatibility with python 2.4 (centos53)
146 if sys.version_info < (2, 5):
147 SimpleXMLRPCServer.SimpleXMLRPCDispatcher.__init__(self)
149 SimpleXMLRPCServer.SimpleXMLRPCDispatcher.__init__(self, True, None)
150 SocketServer.BaseServer.__init__(self, server_address, HandlerClass)
151 ctx = SSL.Context(SSL.SSLv23_METHOD)
152 ctx.use_privatekey_file(key_file)
153 ctx.use_certificate_file(cert_file)
154 # If you wanted to verify certs against known CAs.. this is how you would do it
155 #ctx.load_verify_locations('/etc/sfa/trusted_roots/plc.gpo.gid')
156 ctx.set_verify(SSL.VERIFY_PEER | SSL.VERIFY_FAIL_IF_NO_PEER_CERT, verify_callback)
157 ctx.set_verify_depth(5)
158 ctx.set_app_data(self)
159 self.socket = SSL.Connection(ctx, socket.socket(self.address_family,
162 self.server_activate()
166 # Convert an exception on the server to a full stack trace and send it to
169 def _dispatch(self, method, params):
171 return SimpleXMLRPCServer.SimpleXMLRPCDispatcher._dispatch(self, method, params)
173 # can't use format_exc() as it is not available in jython yet
175 type, value, tb = sys.exc_info()
176 raise xmlrpclib.Fault(1,''.join(traceback.format_exception(type, value, tb)))
178 ## From Active State code: http://code.activestate.com/recipes/574454/
179 # This is intended as a drop-in replacement for the ThreadingMixIn class in
180 # module SocketServer of the standard lib. Instead of spawning a new thread
181 # for each request, requests are processed by of pool of reusable threads.
182 class ThreadPoolMixIn(SocketServer.ThreadingMixIn):
184 use a thread pool instead of a new thread on every request
186 # XX TODO: Make this configurable
188 # numThreads = config.SFA_SERVER_NUM_THREADS
190 allow_reuse_address = True # seems to fix socket.error on server restart
192 def serve_forever(self):
194 Handle one request at a time until doomsday.
196 # set up the threadpool
197 self.requests = Queue()
199 for x in range(self.numThreads):
200 t = threading.Thread(target = self.process_request_thread)
206 self.handle_request()
211 def process_request_thread(self):
213 obtain request from queue instead of directly from server socket
216 SocketServer.ThreadingMixIn.process_request_thread(self, *self.requests.get())
219 def handle_request(self):
221 simply collect requests and put them on the queue for the workers.
224 request, client_address = self.get_request()
227 if self.verify_request(request, client_address):
228 self.requests.put((request, client_address))
230 class ThreadedServer(ThreadPoolMixIn, SecureXMLRPCServer):
233 # Implements an HTTPS XML-RPC server. Generally it is expected that SFA
234 # functions will take a credential string, which is passed to
235 # decode_authentication. Decode_authentication() will verify the validity of
236 # the credential, and verify that the user is using the key that matches the
237 # GID supplied in the credential.
239 class SfaServer(threading.Thread):
242 # Create a new SfaServer object.
244 # @param ip the ip address to listen on
245 # @param port the port to listen on
246 # @param key_file private key filename of registry
247 # @param cert_file certificate filename containing public key
248 # (could be a GID file)
250 def __init__(self, ip, port, key_file, cert_file):
251 threading.Thread.__init__(self)
252 self.key = Keypair(filename = key_file)
253 self.cert = Certificate(filename = cert_file)
254 #self.server = SecureXMLRPCServer((ip, port), SecureXMLRpcRequestHandler, key_file, cert_file)
255 self.server = ThreadedServer((ip, port), SecureXMLRpcRequestHandler, key_file, cert_file)
256 self.trusted_cert_list = None
257 self.register_functions()
261 # Register functions that will be served by the XMLRPC server. This
262 # function should be overridden by each descendant class.
264 def register_functions(self):
265 self.server.register_function(self.noop)
268 # Sample no-op server function. The no-op function decodes the credential
269 # that was passed to it.
271 def noop(self, cred, anything):
272 self.decode_authentication(cred)
276 # Execute the server, serving requests forever.
279 self.server.serve_forever()