path: root/src/sbin/Bcfg2ServerX

#!/usr/bin/env python

'''The XML-RPC Bcfg2 Server'''
__revision__ = '$Revision:$'

# M2Crypto
from M2Crypto import SSL
# /F's xmlrpcserver.py.
from SimpleXMLRPCServer import SimpleXMLRPCRequestHandler, SimpleXMLRPCDispatcher
from ConfigParser import ConfigParser
from getopt import getopt, GetoptError
from sys import argv
from syslog import openlog, LOG_LOCAL0, syslog, LOG_INFO, LOG_ERR
from Bcfg2.Server.Core import Core, CoreInitError
from Bcfg2.Server.Metadata import MetadataConsistencyError
from threading import Lock
from urlparse import urlparse
from select import select, error as selecterror
from xmlrpclib import Fault, dumps, loads
import sys
from time import time
from socket import gethostbyaddr, herror
from elementtree.ElementTree import XML, Element, tostring

def dgetopt(arglist, opt, vopt):
    '''parse options into a dictionary'''
    ret = {}
    for optname in opt.values() + vopt.values():
        ret[optname] = False
    gstr = "".join(opt.keys()) + "".join([field+':' for field in vopt.keys()])
    try:
        opts = getopt(arglist, gstr)[0]
    except GetoptError, gerr:
        print gerr
        print "bcfg2 Usage:"
        for arg in opt.iteritems():
            print " -%s %s" % arg
        for arg in  vopt.iteritems():
            print " -%s <%s>" % arg
        raise SystemExit, 1
    for (gopt, garg) in opts:
        option = gopt[1:]
        if opt.has_key(option):
            ret[opt[option]] = True
        else:
            ret[vopt[option]] = garg
    return ret

class Bcfg2XMLRPCRequestHandler(SimpleXMLRPCRequestHandler):
    '''Bcfg2XMLRPCRequestHandler 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._bcfg_marshaled_dispatch(data, self.client_address)
        except: # 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
            stamp1 = time()
            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()
            stamp2 = time()
            self.connection.shutdown(1)
            print "write time was %f seconds" % (stamp2-stamp1)

class Bcfg2XMLRPCServer(SSL.SSLServer,
                         SimpleXMLRPCDispatcher):
    """The Bcfg2 Server component providing XML-RPC access to Bcfg methods"""

    def __init__(self, setup):
        # need to get addr
        self.setup = setup
        self.cfile = 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
        if self.cfile.get('communication', 'protocol') != 'xmlrpc/ssl':
            print "Unsupported protocol, exiting."
            raise SystemExit, 1
        location = urlparse(self.cfile.get('communication', 'url'))[1].split(':')
        location = (location[0], int(location[1]))
        self.password = self.cfile.get('communication', 'password')
        sslctx = SSL.Context('sslv23')
        sslctx.load_cert_chain('server.pem')
        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('Bcfg2')
        sslctx.set_info_callback(self.handle_sslinfo)
        sslctx.set_tmp_dh('dh1024.pem')
        self.logRequests = 0
        SimpleXMLRPCDispatcher.__init__(self)
        SSL.SSLServer.__init__(self, location, Bcfg2XMLRPCRequestHandler, sslctx)
        syslog(LOG_INFO, "Bound to port %s" % location[1])
        try:
            self.Core = Core(setup, cfilename)
            self.CoreLock = Lock()
        except CoreInitError, msg:
            print msg
            raise SystemExit, 1
        self.register_introspection_functions()
        self.register_function(self.func2, "func2")
        self.register_function(self.Bcfg2GetConfig, "GetConfig")
        self.register_function(self.Bcfg2GetProbes, "GetProbes")
        self.register_function(self.Bcfg2RecvProbeData, "RecvProbeData")
        self.register_function(self.Bcfg2RecvStats, "RecvStats")

    def func2(self, address, arg):
        '''dummy test function'''
        print address, arg
        return 30 * "foo"

    def handle_sslinfo(self, where, ret, ssl_ptr):
        '''This is where we need to handle all ssl negotiation issues'''
        pass

    def get_request(self):
        '''We need to do work between requests, so we select with timeout instead of blocking in accept'''
        rsockinfo = []
        famfd = self.Core.fam.fm.fileno()
        while self.socket not in rsockinfo:
            try:
                rsockinfo = select([self.socket, famfd], [], [])[0]
            except selecterror:
                continue
            if famfd in rsockinfo:
                print "starting fs sync...", 
                while self.Core.fam.fm.pending():
                    self.Core.fam.HandleEvent()
                print "done"
            if self.socket in rsockinfo:
                return self.socket.accept()

    def _bcfg_marshaled_dispatch(self, data, address):
        """Decode and dispatch XMLRPC requests. Overloaded to pass through
        client address information
        """
        print "in _bcfg_marshalled_dispatch"

        rawparams, method = loads(data)

        if len(rawparams) < 2:
            return dumps(Fault(2, "No Authentication Info"))
        user = rawparams[0]
        password = rawparams[1]
        params = rawparams[2:]
        # check authentication
        print "in _bcfg_marshalled_dispatch 1: user=%s, password=%s" % (user, password)
        if not self._authenticate_connection(method, user, password, address):
            return dumps(Fault(3, "Authentication Failure"))
        # generate response
        print "in _bcfg_marshalled_dispatch 2"
        try:
            response = self._dispatch(method, (address, ) + params)
            # wrap response in a singleton tuple
            response = (response,)
            response = dumps(response, methodresponse=1)
        except Fault, fault:
            print "hit error path"
            response = dumps(fault)
        except:
            # report exception back to server
            response = dumps(Fault(1,
                                   "%s:%s" % (sys.exc_type, sys.exc_value)))
        print "in _bcfg_marshalled_dispatch 3"

        return response

    def _authenticate_connection(self, method, user, password, address):
        '''Authenticate new connection'''
        (user, address, method)
        return password == self.password

    def Bcfg2GetProbes(self, address):
        '''Fetch probes for a particular client'''
        peer = address[0]
        resp = Element('probes')
        try:
            client = gethostbyaddr(peer)[0]
        except herror:
            raise Fault, "host resolution error"
        try:
            meta = self.Core.metadata.FetchMetadata(client)
        except MetadataConsistencyError:
            raise Fault, 'metadata resolution error'
        for generator in self.Core.generators:
            for probe in generator.GetProbes(meta):
                resp.append(probe)
        return tostring(resp)

    def Bcfg2RecvProbeData(self, address, probedata):
        '''Receive probe data from clients'''
        print "in RecvProbeData"
        peer = address[0]
        try:
            client = gethostbyaddr(peer)[0]
        except herror:
            raise Fault, "host resolution error"
        for data in probedata:
            try:
                [generator] = [gen for gen in self.Core.generators if gen.__name__ == data.get('source')]
                generator.ReceiveData(client, data)
            except IndexError:
                syslog(LOG_ERR, "Failed to locate plugin %s" % (data.get('source')))
            except:
                syslog(LOG_ERR, "Unexpected failure in probe data receipt")
        return True

    def Bcfg2GetConfig(self, address, image=False, profile=False):
        '''Build config for a client'''
        peer = address[0]
        try:
            client = gethostbyaddr(peer)[0]
        except herror:
            raise Fault, "host resolution error"
        if image and profile:
            try:
                # if metadata is provided, call FetchMetadata with settings
                # it is screwey. i know.
                self.Core.metadata.FetchMetadata(client, image=image, profile=profile)
            except MetadataConsistencyError:
                syslog(LOG_ERR, "Metadata consistency error for client %s" % client)
                return Fault, 'metadata error'
        return tostring(self.Core.BuildConfiguration(client))

    def Bcfg2RecvStats(self, address, stats):
        '''Act on statistics upload'''
        sdata = XML(stats)
        e = sdata.find(".//Statistics")
        # Versioned stats to prevent tied client/server upgrade
        if e.get('version') >= '2.0':
            try:
                client = gethostbyaddr(address[0])[0]
            except herror:
                return Fault, 'host resolution error'

            # Update statistics
            self.Core.stats.updateStats(sdata, client)

        syslog(LOG_INFO, "Client %s reported state %s"%(client, e.attrib['state']))
        return "<ok/>"

if __name__ == '__main__':
    openlog("Bcfg2", 0, LOG_LOCAL0)
    options =  {'v':'verbose', 'd':'debug'}
    doptions = {'D':'daemon', 'c':'configfile', 'C':'client'}
    ssetup = dgetopt(argv[1:], options, doptions)
    s = Bcfg2XMLRPCServer(ssetup)
    s.serve_forever()