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'''Cobalt component base classes'''
__revision__ = '$Revision$'
import atexit, logging, select, signal, socket, sys, time, urlparse, xmlrpclib, cPickle, ConfigParser
import BaseHTTPServer, OpenSSL.SSL, SimpleXMLRPCServer, SocketServer
import Bcfg2.Client.Proxy as Proxy
log = logging.getLogger('Component')
class ComponentInitError(Exception):
'''Raised in case of component initialization failure'''
pass
class CobaltXMLRPCRequestHandler(SimpleXMLRPCServer.SimpleXMLRPCRequestHandler):
'''CobaltXMLRPCRequestHandler takes care of ssl xmlrpc requests'''
def finish(self):
'''Finish HTTPS connections properly'''
self.request.close()
def do_POST(self):
'''Overload do_POST to pass through client address information'''
try:
# get arguments
data = self.rfile.read(int(self.headers["content-length"]))
response = self.server._cobalt_marshalled_dispatch(data, self.client_address)
except OpenSSL.SSL.SysCallError:
log.error("Client %s unexpectedly closed connection" % (self.client_address[0]))
except: # This should only happen if the module is buggy
# internal error, report as HTTP server error
log.error("Unexcepted handler failure in do_POST", exc_info=1)
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()
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)
class SSLServer(BaseHTTPServer.HTTPServer):
'''This class encapsulates all of the ssl server stuff'''
def __init__(self, address, keyfile, handler):
SocketServer.BaseServer.__init__(self, address, handler)
ctxt = OpenSSL.SSL.Context(OpenSSL.SSL.SSLv23_METHOD)
print keyfile
ctxt.use_privatekey_file (keyfile)
ctxt.use_certificate_file(keyfile)
#ctxt.load_verify_locations('/tmp/keys/CA.cert')
ctxt.set_verify(OpenSSL.SSL.VERIFY_PEER, self.verify_cb)
self.socket = OpenSSL.SSL.Connection(ctxt,
socket.socket(self.address_family, self.socket_type))
self.server_bind()
self.server_activate()
def verify_cb(self, conn, cert, errnum, depth, ok):
'''handle cerificate verification'''
print "here"
print 'Got cert: %s' % (cert.get_subject())
print cert.get_pubkey()
return ok
def handle_request(self):
"""Handle one request, possibly blocking."""
try:
request, client_address = self.get_request()
except socket.error:
return
if self.verify_request(request, client_address):
try:
self.process_request(request, client_address)
except Exception, err:
if isinstance(err, OpenSSL.SSL.Error):
if isinstance(err, OpenSSL.SSL.SysCallError):
log.error("Client %s unexpectedly closed connection" % (client_address[0]))
else:
log.error("%s from %s" % (err[0][0][2], client_address[0]))
else:
log.error("Unknown socket I/O failure from %s" % (client_address[0]), exc_info=1)
self.close_request(request)
class Component(SSLServer,
SimpleXMLRPCServer.SimpleXMLRPCDispatcher):
"""Cobalt component providing XML-RPC access"""
__name__ = 'Component'
__implementation__ = 'Generic'
__statefields__ = []
async_funcs = ['assert_location']
def __init__(self, setup):
# need to get addr
self.setup = setup
self.shut = False
signal.signal(signal.SIGINT, self.start_shutdown)
signal.signal(signal.SIGTERM, self.start_shutdown)
self.logger = logging.getLogger('Component')
self.cfile = ConfigParser.ConfigParser()
if setup['configfile']:
cfilename = setup['configfile']
else:
cfilename = '/etc/bcfg2.conf'
self.cfile.read([cfilename])
if not self.cfile.has_section('communication'):
print "Configfile missing communication section"
raise SystemExit, 1
self.static = False
if not self.cfile.has_section('components'):
print "Configfile missing components section"
raise SystemExit, 1
if self.cfile._sections['components'].has_key(self.__name__):
self.static = True
location = urlparse.urlparse(self.cfile.get('components', self.__name__))[1].split(':')
location = (location[0], int(location[1]))
else:
location = (socket.gethostname(), 0)
try:
keyfile = self.cfile.get('communication', 'key')
#keyfile = '/tmp/keys/server.pkey'
except ConfigParser.NoOptionError:
print "No key specified in cobalt.conf"
raise SystemExit, 1
self.password = self.cfile.get('communication', 'password')
try:
SSLServer.__init__(self, location, keyfile, CobaltXMLRPCRequestHandler)
except:
self.logger.error("Failed to load ssl key %s" % (keyfile), exc_info=1)
raise ComponentInitError
try:
SimpleXMLRPCServer.SimpleXMLRPCDispatcher.__init__(self)
except TypeError:
SimpleXMLRPCServer.SimpleXMLRPCDispatcher.__init__(self, False, None)
self.logRequests = 0
self.port = self.socket.getsockname()[1]
self.url = "https://%s:%s" % (socket.gethostname(), self.port)
self.logger.info("Bound to port %s" % self.port)
self.funcs.update({'HandleEvents':self.HandleEvents,
'system.listMethods':self.addr_system_listMethods})
self.atime = 0
self.assert_location()
atexit.register(self.deassert_location)
def HandleEvents(self, address, event_list):
'''Default event handler'''
return True
def _cobalt_marshalled_dispatch(self, data, address):
"""Decode and dispatch XMLRPC requests. Overloaded to pass through
client address information
"""
rawparams, method = xmlrpclib.loads(data)
if len(rawparams) < 2:
self.logger.error("No authentication included with request from %s" % address[0])
return xmlrpclib.dumps(xmlrpclib.Fault(2, "No Authentication Info"))
user = rawparams[0]
password = rawparams[1]
params = rawparams[2:]
# check authentication
if not self._authenticate_connection(method, user, password, address):
self.logger.error("Authentication failure from %s" % address[0])
return xmlrpclib.dumps(xmlrpclib.Fault(3, "Authentication Failure"))
# generate response
try:
# all handlers must take address as the first argument
response = self._dispatch(method, (address, ) + params)
# wrap response in a singleton tuple
response = (response,)
response = xmlrpclib.dumps(response, methodresponse=1)
except xmlrpclib.Fault, fault:
response = xmlrpclib.dumps(fault)
except TypeError, terror:
self.logger.error("Client %s called function %s with wrong argument count" %
(address[0], method), exc_info=1)
response = xmlrpclib.dumps(xmlrpclib.Fault(4, terror.args[0]))
except:
self.logger.error("Unexpected handler failure", exc_info=1)
# report exception back to server
response = xmlrpclib.dumps(xmlrpclib.Fault(1,
"%s:%s" % (sys.exc_type, sys.exc_value)))
return response
def _authenticate_connection(self, method, user, password, address):
'''Authenticate new connection'''
(user, address, method)
return password == self.password
def save_state(self):
'''Save fields defined in __statefields__ in /var/spool/cobalt/__implementation__'''
if self.__statefields__:
savedata = tuple([getattr(self, field) for field in self.__statefields__])
try:
statefile = open("/var/spool/cobalt/%s" % self.__implementation__, 'w')
# need to flock here
statefile.write(cPickle.dumps(savedata))
except:
self.logger.info("Statefile save failed; data persistence disabled")
self.__statefields__ = []
def load_state(self):
'''Load fields defined in __statefields__ from /var/spool/cobalt/__implementation__'''
if self.__statefields__:
try:
loaddata = cPickle.loads(open("/var/spool/cobalt/%s" % self.__implementation__).read())
except:
self.logger.info("Statefile load failed")
return
for field in self.__statefields__:
setattr(self, field, loaddata[self.__statefields__.index(field)])
def addr_system_listMethods(self, address):
"""get rid of the address argument and call the underlying dispatcher method"""
return SimpleXMLRPCServer.SimpleXMLRPCDispatcher.system_listMethods(self)
def get_request(self):
'''We need to do work between requests, so select with timeout instead of blocking in accept'''
rsockinfo = []
while self.socket not in rsockinfo:
if self.shut:
raise socket.error
for funcname in self.async_funcs:
func = getattr(self, funcname, False)
if callable(func):
func()
else:
self.logger.error("Cannot call uncallable method %s" % (funcname))
try:
rsockinfo = select.select([self.socket], [], [], 10)[0]
except select.error:
continue
if self.socket in rsockinfo:
return self.socket.accept()
def assert_location(self):
'''Assert component location with slp'''
if self.__name__ == 'service-location' or self.static:
return
if (time.time() - self.atime) > 240:
slp = Proxy.service_location()
slp.AssertService({'tag':'location', 'name':self.__name__, 'url':self.url})
self.atime = time.time()
def deassert_location(self):
'''remove registration from slp'''
if self.__name__ == 'service-location' or self.static:
return
slp = Proxy.service_location()
try:
slp.DeassertService([{'tag':'location', 'name':self.__name__, 'url':self.url}])
except xmlrpclib.Fault, fault:
if fault.faultCode == 11:
self.logger.error("Failed to deregister self; no matching component")
def serve_forever(self):
"""Handle one request at a time until doomsday."""
while not self.shut:
self.handle_request()
def start_shutdown(self, signum, frame):
'''Shutdown on unexpected signals'''
self.shut = True
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