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#!/usr/bin/python
"""
func
Copyright 2007, Red Hat, Inc
see AUTHORS
This software may be freely redistributed under the terms of the GNU
general public license.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
"""
# standard modules
import SimpleXMLRPCServer
import string
import sys
import traceback
import socket
from gettext import textdomain
I18N_DOMAIN = "func"
from func.config import read_config
from func.commonconfig import FuncdConfig
from func import logger
from func import certs
# our modules
import AuthedXMLRPCServer
import codes
import module_loader
import utils
class XmlRpcInterface(object):
def __init__(self):
"""
Constructor.
"""
config_file = '/etc/func/minion.conf'
self.config = read_config(config_file, FuncdConfig)
self.logger = logger.Logger().logger
self.audit_logger = logger.AuditLogger()
self.__setup_handlers()
# need a reference so we can log ip's, certs, etc
# self.server = server
def __setup_handlers(self):
"""
Add RPC functions from each class to the global list so they can be called.
"""
self.handlers = {}
for x in self.modules.keys():
try:
self.modules[x].register_rpc(self.handlers, x)
self.logger.debug("adding %s" % x)
except AttributeError, e:
self.logger.warning("module %s not loaded, missing register_rpc method" % self.modules[x])
# internal methods that we do instead of spreading internal goo
# all over the modules. For now, at lest -akl
# system.listMethods os a quasi stanard xmlrpc method, so
# thats why it has a odd looking name
self.handlers["system.listMethods"] = self.list_methods
self.handlers["system.list_modules"] = self.list_modules
def list_modules(self):
modules = self.modules.keys()
modules.sort()
return modules
def list_methods(self):
methods = self.handlers.keys()
methods.sort()
return methods
def get_dispatch_method(self, method):
if method in self.handlers:
return FuncApiMethod(self.logger, method, self.handlers[method])
else:
self.logger.info("Unhandled method call for method: %s " % method)
raise codes.InvalidMethodException
class FuncApiMethod:
"""
Used to hold a reference to all of the registered functions.
"""
def __init__(self, logger, name, method):
self.logger = logger
self.__method = method
self.__name = name
def __log_exc(self):
"""
Log an exception.
"""
(t, v, tb) = sys.exc_info()
self.logger.info("Exception occured: %s" % t )
self.logger.info("Exception value: %s" % v)
self.logger.info("Exception Info:\n%s" % string.join(traceback.format_list(traceback.extract_tb(tb))))
def __call__(self, *args):
self.logger.debug("(X) -------------------------------------------")
try:
rc = self.__method(*args)
except codes.FuncException, e:
self.__log_exc()
rc = e
except:
self.logger.debug("Not a Func-specific exception")
self.__log_exc()
raise
self.logger.debug("Return code for %s: %s" % (self.__name, rc))
return rc
def serve():
"""
Code for starting the XMLRPC service.
"""
server =FuncSSLXMLRPCServer(('', 51234))
server.logRequests = 0 # don't print stuff to console
server.serve_forever()
class FuncXMLRPCServer(SimpleXMLRPCServer.SimpleXMLRPCServer, XmlRpcInterface):
def __init__(self, args):
self.allow_reuse_address = True
self.modules = module_loader.load_modules()
SimpleXMLRPCServer.SimpleXMLRPCServer.__init__(self, args)
XmlRpcInterface.__init__(self)
class FuncSSLXMLRPCServer(AuthedXMLRPCServer.AuthedSSLXMLRPCServer,
XmlRpcInterface):
def __init__(self, args):
self.allow_reuse_address = True
self.modules = module_loader.load_modules()
XmlRpcInterface.__init__(self)
hn = utils.get_hostname()
self.key = "%s/%s.pem" % (self.config.cert_dir, hn)
self.cert = "%s/%s.cert" % (self.config.cert_dir, hn)
self.ca = "%s/ca.cert" % self.config.cert_dir
self._our_ca = certs.retrieve_cert_from_file(self.ca)
AuthedXMLRPCServer.AuthedSSLXMLRPCServer.__init__(self, ("", 51234),
self.key, self.cert,
self.ca)
def _dispatch(self, method, params):
"""
the SimpleXMLRPCServer class will call _dispatch if it doesn't
find a handler method
"""
# take _this_request and hand it off to check out the acls of the method
# being called vs the requesting host
if not hasattr(self, '_this_request'):
raise codes.InvalidMethodException
r,a = self._this_request
peer_cert = r.get_peer_certificate()
ip = a[0]
if not self._check_acl(peer_cert, ip, method, params):
raise codes.AccessToMethodDenied
# Recognize ipython's tab completion calls
if method == 'trait_names' or method == '_getAttributeNames':
return self.handlers.keys()
cn = peer_cert.get_subject().CN
sub_hash = peer_cert.subject_name_hash()
self.audit_logger.log_call(ip, cn, sub_hash, method, params)
return self.get_dispatch_method(method)(*params)
def auth_cb(self, request, client_address):
peer_cert = request.get_peer_certificate()
return peer_cert.get_subject().CN
def _check_acl(self, cert, ip, method, params):
cn = cert.get_subject().CN
sub_hash = cert.subject_name_hash()
# FIXME - make this be more useful, obviously :)
# until we figure out the right config - just say - if the cert
# is not the cert of our ca (which is where overlord/func/certmaster
# runs then return False
ca_cn = self._our_ca.get_subject().CN
ca_hash = self._our_ca.subject_name_hash()
if cn == ca_cn and sub_hash == ca_hash:
return True
# clearly other method/param checks here
return False
def main(argv):
"""
Start things up.
"""
if "daemon" in sys.argv or "--daemon" in sys.argv:
utils.daemonize("/var/run/funcd.pid")
else:
print "serving...\n"
try:
utils.create_minion_keys()
serve()
except codes.FuncException, e:
print >> sys.stderr, 'error: %s' % e
sys.exit(1)
# ======================================================================================
if __name__ == "__main__":
textdomain(I18N_DOMAIN)
main(sys.argv)
|
