## # This module implements a general-purpose server layer for sfa. # The same basic server should be usable on the registry, component, or # other interfaces. # # TODO: investigate ways to combine this with existing PLC server? ## ### $Id$ ### $URL$ import sys import traceback import threading import socket, os import SocketServer import BaseHTTPServer import SimpleHTTPServer import SimpleXMLRPCServer from OpenSSL import SSL from sfa.trust.certificate import Keypair, Certificate from sfa.trust.credential import * from sfa.util.faults import * from sfa.plc.api import SfaAPI from sfa.util.debug import log ## # Verification callback for pyOpenSSL. We do our own checking of keys because # we have our own authentication spec. Thus we disable several of the normal # prohibitions that OpenSSL places on certificates def verify_callback(conn, x509, err, depth, preverify): # if the cert has been preverified, then it is ok if preverify: #print " preverified" return 1 # we're only passing single certificates, not chains if depth > 0: #print " depth > 0 in verify_callback" return 0 # create a Certificate object and load it from the client's x509 ctx = conn.get_context() server = ctx.get_app_data() server.peer_cert = Certificate() server.peer_cert.load_from_pyopenssl_x509(x509) # the certificate verification done by openssl checks a number of things # that we aren't interested in, so we look out for those error messages # and ignore them # XXX SMBAKER: I don't know what this error is, but it's being returned # by newer pl nodes. if err == 9: #print " X509_V_ERR_CERT_NOT_YET_VALID" return 1 # allow self-signed certificates if err == 18: #print " X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT" return 1 # allow certs that don't have an issuer if err == 20: #print " X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY" return 1 # allow certs that are untrusted if err == 21: #print " X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE" return 1 # allow certs that are untrusted if err == 27: #print " X509_V_ERR_CERT_UNTRUSTED" return 1 print " error", err, "in verify_callback" return 0 ## # Taken from the web (XXX find reference). Implements an HTTPS xmlrpc server class SecureXMLRPCServer(BaseHTTPServer.HTTPServer,SimpleXMLRPCServer.SimpleXMLRPCDispatcher): def __init__(self, server_address, HandlerClass, key_file, cert_file, logRequests=True): """Secure XML-RPC server. It it very similar to SimpleXMLRPCServer but it uses HTTPS for transporting XML data. """ self.logRequests = logRequests self.interface = None self.key_file = key_file self.cert_file = cert_file #for compatibility with python 2.4 (centos53) if sys.version_info < (2, 5): SimpleXMLRPCServer.SimpleXMLRPCDispatcher.__init__(self) else: SimpleXMLRPCServer.SimpleXMLRPCDispatcher.__init__(self, True, None) SocketServer.BaseServer.__init__(self, server_address, HandlerClass) ctx = SSL.Context(SSL.SSLv23_METHOD) ctx.use_privatekey_file(key_file) ctx.use_certificate_file(cert_file) ctx.set_verify(SSL.VERIFY_PEER | SSL.VERIFY_FAIL_IF_NO_PEER_CERT, verify_callback) ctx.set_app_data(self) self.socket = SSL.Connection(ctx, socket.socket(self.address_family, self.socket_type)) self.server_bind() self.server_activate() # _dispatch # # Convert an exception on the server to a full stack trace and send it to # the client. def _dispatch(self, method, params): try: return SimpleXMLRPCServer.SimpleXMLRPCDispatcher._dispatch(self, method, params) except: # can't use format_exc() as it is not available in jython yet # (evein in trunk). type, value, tb = sys.exc_info() raise xmlrpclib.Fault(1,''.join(traceback.format_exception(type, value, tb))) ## # taken from the web (XXX find reference). Implents HTTPS xmlrpc request handler class SecureXMLRpcRequestHandler(SimpleXMLRPCServer.SimpleXMLRPCRequestHandler): """Secure XML-RPC request handler class. It it very similar to SimpleXMLRPCRequestHandler but it uses HTTPS for transporting XML data. """ def setup(self): self.connection = self.request self.rfile = socket._fileobject(self.request, "rb", self.rbufsize) self.wfile = socket._fileobject(self.request, "wb", self.wbufsize) def do_POST(self): """Handles the HTTPS POST request. It was copied out from SimpleXMLRPCServer.py and modified to shutdown the socket cleanly. """ try: self.api = SfaAPI(peer_cert = self.server.peer_cert, interface = self.server.interface, key_file = self.server.key_file, cert_file = self.server.cert_file) # get arguments request = self.rfile.read(int(self.headers["content-length"])) # In previous versions of SimpleXMLRPCServer, _dispatch # could be overridden in this class, instead of in # SimpleXMLRPCDispatcher. To maintain backwards compatibility, # check to see if a subclass implements _dispatch and dispatch # using that method if present. #response = self.server._marshaled_dispatch(request, getattr(self, '_dispatch', None)) remote_addr = (remote_ip, remote_port) = self.connection.getpeername() self.api.remote_addr = remote_addr response = self.api.handle(remote_addr, request) except Exception, fault: raise # This should only happen if the module is buggy # internal error, report as HTTP server error self.send_response(500) self.end_headers() else: # got a valid XML RPC response self.send_response(200) self.send_header("Content-type", "text/xml") self.send_header("Content-length", str(len(response))) self.end_headers() self.wfile.write(response) # shut down the connection self.wfile.flush() self.connection.shutdown() # Modified here! ## # Implements an HTTPS XML-RPC server. Generally it is expected that SFA # functions will take a credential string, which is passed to # decode_authentication. Decode_authentication() will verify the validity of # the credential, and verify that the user is using the key that matches the # GID supplied in the credential. class SfaServer(threading.Thread): ## # Create a new SfaServer object. # # @param ip the ip address to listen on # @param port the port to listen on # @param key_file private key filename of registry # @param cert_file certificate filename containing public key # (could be a GID file) def __init__(self, ip, port, key_file, cert_file): threading.Thread.__init__(self) self.key = Keypair(filename = key_file) self.cert = Certificate(filename = cert_file) self.server = SecureXMLRPCServer((ip, port), SecureXMLRpcRequestHandler, key_file, cert_file) self.trusted_cert_list = None self.register_functions() ## # Register functions that will be served by the XMLRPC server. This # function should be overrided by each descendant class. def register_functions(self): self.server.register_function(self.noop) ## # Sample no-op server function. The no-op function decodes the credential # that was passed to it. def noop(self, cred, anything): self.decode_authentication(cred) return anything ## # Execute the server, serving requests forever. def run(self): self.server.serve_forever()