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'''Cobalt component base classes'''
__revision__ = '$Revision: 1.4 $'
from ConfigParser import ConfigParser, NoOptionError
from cPickle import loads, dumps
from M2Crypto import SSL
from SimpleXMLRPCServer import SimpleXMLRPCRequestHandler
from select import select
from socket import gethostname
from sys import exc_info
import sys
from syslog import openlog, syslog, LOG_INFO, LOG_ERR, LOG_LOCAL0
from traceback import extract_tb
from xmlrpclib import dumps, loads, Fault
from urlparse import urlparse
try:
from SimpleXMLRPCServer import SimpleXMLRPCDispatcher
except ImportError:
SimpleXMLRPCDispatcher = object
class CobaltXMLRPCRequestHandler(SimpleXMLRPCRequestHandler):
'''CobaltXMLRPCRequestHandler takes care of ssl xmlrpc requests'''
def finish(self):
'''Finish HTTPS connections properly'''
self.request.set_shutdown(SSL.SSL_RECEIVED_SHUTDOWN | SSL.SSL_SENT_SHUTDOWN)
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: # This should only happen if the module is buggy
# internal error, report as HTTP server error
(trace, val, trb) = exc_info()
syslog(LOG_ERR, "Unexpected failure in handler")
for line in extract_tb(trb):
syslog(LOG_ERR, ' File "%s", line %i, in %s\n %s\n' % line)
syslog(LOG_ERR, "%s: %s\n"%(trace, val))
del trace, val, trb
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(1)
class Component(SSL.SSLServer,
SimpleXMLRPCDispatcher):
"""Cobalt component providing XML-RPC access"""
__name__ = 'Component'
__implementation__ = 'Generic'
__statefields__ = []
def __init__(self, setup):
# need to get addr
self.setup = setup
self.cfile = ConfigParser()
openlog(self.__implementation__, 0, LOG_LOCAL0)
if setup['configfile']:
cfilename = setup['configfile']
else:
cfilename = '/etc/cobalt.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(self.cfile.get('components', self.__name__))[1].split(':')
location = (location[0], int(location[1]))
else:
location = (gethostname(), 0)
self.password = self.cfile.get('communication', 'password')
sslctx = SSL.Context('sslv23')
try:
keyfile = self.cfile.get('communication', 'key')
except NoOptionError:
print "No key specified in cobalt.conf"
raise SystemExit, 1
sslctx.load_cert_chain(keyfile)
#sslctx.load_verify_locations('ca.pem')
#sslctx.set_client_CA_list_from_file('ca.pem')
sslctx.set_verify(SSL.verify_none, 15)
#sslctx.set_allow_unknown_ca(1)
sslctx.set_session_id_ctx(self.__name__)
sslctx.set_info_callback(self.handle_sslinfo)
#sslctx.set_tmp_dh('dh1024.pem')
self.logRequests = 0
# setup unhandled request syslog handling
SimpleXMLRPCDispatcher.__init__(self)
SSL.SSLServer.__init__(self, location, CobaltXMLRPCRequestHandler, sslctx)
self.port = self.socket.socket.getsockname()[1]
syslog(LOG_INFO, "Bound to port %s" % self.port)
self.funcs.update({'HandleEvents':self.HandleEvents,
'system.listMethods':self.system_listMethods})
def HandleEvents(self, address, event_list):
'''Default event handler'''
return True
def handle_sslinfo(self, where, ret, ssl_ptr):
'''This is where we need to handle all ssl negotiation issues'''
pass
def _cobalt_marshalled_dispatch(self, data, address):
"""Decode and dispatch XMLRPC requests. Overloaded to pass through
client address information
"""
rawparams, method = loads(data)
if len(rawparams) < 2:
syslog(LOG_ERR, "No authentication included with request from %s" % address[0])
return dumps(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):
syslog(LOG_ERR, "Authentication failure from %s" % address[0])
return dumps(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 = dumps(response, methodresponse=1)
except Fault, fault:
response = dumps(fault)
except TypeError, t:
syslog(LOG_ERR, "Client %s called function %s with wrong argument count" %
(address[0], method))
response = dumps(Fault(4, t.args[0]))
except:
(trace, val, trb) = exc_info()
syslog(LOG_ERR, "Unexpected failure in handler")
for line in extract_tb(trb):
syslog(LOG_ERR, ' File "%s", line %i, in %s\n %s\n' % line)
syslog(LOG_ERR, "%s: %s\n"%(trace, val))
del trace, val, trb
# report exception back to server
response = dumps(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(dumps(savedata))
except:
syslog(LOG_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 = loads(open("/var/spool/cobalt/%s" % self.__implementation__).read())
except:
syslog(LOG_INFO, "Statefile load failed")
return
for field in self.__statefields__:
setattr(self, field, loaddata[self.__statefields__.index(field)])
def system_listMethods(self, address):
"""get rid of the address argument and call the underlying dispatcher method"""
return SimpleXMLRPCDispatcher.system_listMethods(self)
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