mirror of
https://salsa.debian.org/freeipa-team/freeipa.git
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159e848d85
UDP port checks in ipa-replica-conncheck are too strict. The entire conncheck fails when UDP ports cannot be verified as open. However, UDP protocol is unrealiable by its nature and the port can also not be checked if there is an application already bound to it. This can happen for example when ipa-replica-conncheck is run as a part of ipa-ca-install and the replica services are thus already running. This patch changes the behavior of UDP port checks. The conncheck script now rather reports a warning that UDP port cannot be verified but does not fail the entire test. https://fedorahosted.org/freeipa/ticket/2514
407 lines
16 KiB
Python
Executable File
407 lines
16 KiB
Python
Executable File
#! /usr/bin/python -E
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# Authors: Martin Kosek <mkosek@redhat.com>
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#
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# Copyright (C) 2011 Red Hat
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# see file 'COPYING' for use and warranty information
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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from ipapython.config import IPAOptionParser
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from ipapython import version
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from ipapython import ipautil
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from ipapython.ipautil import CalledProcessError
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from ipaserver.install import installutils
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import ipaclient.ipachangeconf
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from optparse import OptionGroup
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from ipapython.ipa_log_manager import *
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import sys
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import os
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import signal
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import tempfile
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import socket
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import time
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import threading
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import errno
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from socket import SOCK_STREAM, SOCK_DGRAM
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CONNECT_TIMEOUT = 5
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RESPONDERS = [ ]
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QUIET = False
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CCACHE_FILE = "/etc/ipa/.conncheck_ccache"
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KRB5_CONFIG = None
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class CheckedPort(object):
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def __init__(self, port, port_type, description):
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self.port = port
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self.port_type = port_type
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self.description = description
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BASE_PORTS = [
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CheckedPort(389, SOCK_STREAM, "Directory Service: Unsecure port"),
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CheckedPort(636, SOCK_STREAM, "Directory Service: Secure port"),
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CheckedPort(88, SOCK_STREAM, "Kerberos KDC: TCP"),
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CheckedPort(88, SOCK_DGRAM, "Kerberos KDC: UDP"),
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CheckedPort(464, SOCK_STREAM, "Kerberos Kpasswd: TCP"),
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CheckedPort(464, SOCK_DGRAM, "Kerberos Kpasswd: UDP"),
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CheckedPort(80, SOCK_STREAM, "HTTP Server: Unsecure port"),
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CheckedPort(443, SOCK_STREAM, "HTTP Server: Secure port"),
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]
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CA_PORTS = [
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CheckedPort(7389, SOCK_STREAM, "PKI-CA: Directory Service port"),
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]
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def print_info(msg):
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if not QUIET:
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print msg
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def parse_options():
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parser = IPAOptionParser(version=version.VERSION)
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replica_group = OptionGroup(parser, "on-replica options")
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replica_group.add_option("-m", "--master", dest="master",
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help="Master address with running IPA for output connection check")
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replica_group.add_option("-a", "--auto-master-check", dest="auto_master_check",
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action="store_true",
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default=False,
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help="Automatically execute connection check on master")
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replica_group.add_option("-r", "--realm", dest="realm",
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help="Realm name")
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replica_group.add_option("-k", "--kdc", dest="kdc",
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help="Master KDC. Defaults to master address")
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replica_group.add_option("-p", "--principal", dest="principal",
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default="admin", help="Principal to use to log in to remote master")
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replica_group.add_option("-w", "--password", dest="password", sensitive=True,
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help="Password for the principal"),
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parser.add_option_group(replica_group)
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master_group = OptionGroup(parser, "on-master options")
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master_group.add_option("-R", "--replica", dest="replica",
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help="Address of remote replica machine to check against")
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parser.add_option_group(master_group)
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common_group = OptionGroup(parser, "common options")
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common_group.add_option("-c", "--check-ca", dest="check_ca",
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action="store_true",
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default=False,
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help="Check also ports for Certificate Authority")
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common_group.add_option("", "--hostname", dest="hostname",
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help="The hostname of this server (FQDN). "
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"By default a nodename from uname(2) is used.")
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parser.add_option_group(common_group)
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parser.add_option("-d", "--debug", dest="debug",
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action="store_true",
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default=False, help="Print debugging information")
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parser.add_option("-q", "--quiet", dest="quiet",
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action="store_true",
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default=False, help="Output only errors")
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options, args = parser.parse_args()
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safe_options = parser.get_safe_opts(options)
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if options.master and options.replica:
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parser.error("on-master and on-replica options are mutually exclusive!")
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if options.master:
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if options.auto_master_check and not options.realm:
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parser.error("Realm is parameter is required to connect to remote master!")
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if not os.getegid() == 0:
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parser.error("You can only run on-replica part as root.")
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if options.master and not options.kdc:
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options.kdc = options.master
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if not options.master and not options.replica:
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parser.error("No action: you should select either --replica or --master option.")
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if not options.hostname:
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options.hostname = socket.getfqdn()
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if options.quiet:
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global QUIET
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QUIET = True
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return safe_options, options
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def logging_setup(options):
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log_file = None
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if os.getegid() == 0:
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log_file = "/var/log/ipareplica-conncheck.log"
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standard_logging_setup(log_file, debug=options.debug)
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def clean_responders(responders):
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if not responders:
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return
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for responder in responders:
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responder.stop()
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for responder in responders:
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responder.join()
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responders.remove(responder)
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def sigterm_handler(signum, frame):
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# do what SIGINT does (raise a KeyboardInterrupt)
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sigint_handler = signal.getsignal(signal.SIGINT)
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if callable(sigint_handler):
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sigint_handler(signum, frame)
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def configure_krb5_conf(realm, kdc, filename):
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krbconf = ipaclient.ipachangeconf.IPAChangeConf("IPA Installer")
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krbconf.setOptionAssignment(" = ")
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krbconf.setSectionNameDelimiters(("[","]"))
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krbconf.setSubSectionDelimiters(("{","}"))
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krbconf.setIndent((""," "," "))
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opts = [{'name':'comment', 'type':'comment', 'value':'File created by ipa-replica-conncheck'},
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{'name':'empty', 'type':'empty'}]
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#[libdefaults]
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libdefaults = [{'name':'default_realm', 'type':'option', 'value':realm}]
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libdefaults.append({'name':'dns_lookup_realm', 'type':'option', 'value':'false'})
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libdefaults.append({'name':'dns_lookup_kdc', 'type':'option', 'value':'false'})
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libdefaults.append({'name':'rdns', 'type':'option', 'value':'false'})
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libdefaults.append({'name':'ticket_lifetime', 'type':'option', 'value':'24h'})
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libdefaults.append({'name':'forwardable', 'type':'option', 'value':'yes'})
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opts.append({'name':'libdefaults', 'type':'section', 'value': libdefaults})
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opts.append({'name':'empty', 'type':'empty'})
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#the following are necessary only if DNS discovery does not work
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#[realms]
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realms_info =[{'name':'kdc', 'type':'option', 'value':ipautil.format_netloc(kdc, 88)},
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{'name':'admin_server', 'type':'option', 'value':ipautil.format_netloc(kdc, 749)}]
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realms = [{'name':realm, 'type':'subsection', 'value':realms_info}]
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opts.append({'name':'realms', 'type':'section', 'value':realms})
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opts.append({'name':'empty', 'type':'empty'})
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#[appdefaults]
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pamopts = [{'name':'debug', 'type':'option', 'value':'false'},
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{'name':'ticket_lifetime', 'type':'option', 'value':'36000'},
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{'name':'renew_lifetime', 'type':'option', 'value':'36000'},
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{'name':'forwardable', 'type':'option', 'value':'true'},
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{'name':'krb4_convert', 'type':'option', 'value':'false'}]
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appopts = [{'name':'pam', 'type':'subsection', 'value':pamopts}]
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opts.append({'name':'appdefaults', 'type':'section', 'value':appopts})
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root_logger.debug("Writing temporary Kerberos configuration to %s:\n%s"
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% (filename, krbconf.dump(opts)))
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krbconf.newConf(filename, opts)
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class PortResponder(threading.Thread):
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def __init__(self, port, port_type, socket_timeout=1):
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super(PortResponder, self).__init__()
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self.port = port
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self.port_type = port_type
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self.socket_timeout = socket_timeout
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self._stop_request = False
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def run(self):
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while not self._stop_request:
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try:
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ipautil.bind_port_responder(self.port,
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self.port_type,
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socket_timeout=self.socket_timeout,
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responder_data="FreeIPA")
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except socket.timeout:
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pass
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except socket.error, e:
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if e.errno == errno.EADDRINUSE:
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time.sleep(1)
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else:
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raise
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def stop(self):
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self._stop_request = True
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def port_check(host, port_list):
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ip = installutils.resolve_host(host)
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if not ip:
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raise RuntimeError("Port check failed! Unable to resolve host name '%s'" % host)
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ports_failed = []
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ports_udp_warning = [] # conncheck could not verify that port is open
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for port in port_list:
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if ipautil.host_port_open(host, port.port, port.port_type, socket_timeout=CONNECT_TIMEOUT):
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result = "OK"
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else:
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if port.port_type == socket.SOCK_DGRAM:
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ports_udp_warning.append(port)
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result = "WARNING"
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else:
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ports_failed.append(port)
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result = "FAILED"
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print_info(" %s (%d): %s" % (port.description, port.port, result))
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if ports_udp_warning:
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print "The following UDP ports could not be verified as open: %s" \
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% ", ".join(str(port.port) for port in ports_udp_warning)
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print "This can happen if they are already bound to an application"
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print "and ipa-replica-conncheck cannot attach own UDP responder."
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if ports_failed:
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msg_ports = []
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for port in ports_failed:
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port_type_text = "TCP" if port.port_type == SOCK_STREAM else "UDP"
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msg_ports.append('%d (%s)' % (port.port, port_type_text))
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raise RuntimeError("Port check failed! Inaccessible port(s): %s" \
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% ", ".join(msg_ports))
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def main():
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safe_options, options = parse_options()
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logging_setup(options)
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root_logger.debug('%s was invoked with options: %s' % (sys.argv[0], safe_options))
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root_logger.debug("missing options might be asked for interactively later\n")
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signal.signal(signal.SIGTERM, sigterm_handler)
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required_ports = BASE_PORTS
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if options.check_ca:
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required_ports.extend(CA_PORTS)
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if options.replica:
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print_info("Check connection from master to remote replica '%s':" % options.replica)
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port_check(options.replica, required_ports)
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print_info("\nConnection from master to replica is OK.")
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# kinit to foreign master
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if options.master:
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# check ports on master first
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print_info("Check connection from replica to remote master '%s':" % options.master)
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tcp_ports = [ port for port in required_ports if port.port_type == SOCK_STREAM ]
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udp_ports = [ port for port in required_ports if port.port_type == SOCK_DGRAM ]
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port_check(options.master, tcp_ports)
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if udp_ports:
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print_info("\nThe following list of ports use UDP protocol and would need to be")
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print_info("checked manually:")
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for port in udp_ports:
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result = "SKIPPED"
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print_info(" %s (%d): %s" % (port.description, port.port, result))
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print_info("\nConnection from replica to master is OK.")
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# create listeners
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global RESPONDERS
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print_info("Start listening on required ports for remote master check")
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for port in required_ports:
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root_logger.debug("Start listening on port %d (%s)" % (port.port, port.description))
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responder = PortResponder(port.port, port.port_type)
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responder.start()
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RESPONDERS.append(responder)
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if options.auto_master_check:
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(krb_fd, krb_name) = tempfile.mkstemp()
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os.close(krb_fd)
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configure_krb5_conf(options.realm, options.kdc, krb_name)
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global KRB5_CONFIG
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KRB5_CONFIG = krb_name
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print_info("Get credentials to log in to remote master")
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if options.principal.find('@') == -1:
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principal = '%s@%s' % (options.principal, options.realm)
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user = options.principal
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else:
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principal = options.principal
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user = options.principal.partition('@')[0]
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if options.password:
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password=options.password
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else:
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password = installutils.read_password(principal, confirm=False,
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validate=False, retry=False)
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if password is None:
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sys.exit("\nPrincipal password required")
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stderr=''
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(stdout, stderr, returncode) = ipautil.run(['/usr/bin/kinit', principal],
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env={'KRB5_CONFIG':KRB5_CONFIG, 'KRB5CCNAME':CCACHE_FILE},
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stdin=password, raiseonerr=False)
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if returncode != 0:
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raise RuntimeError("Cannot acquire Kerberos ticket: %s" % stderr)
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# Verify kinit was actually successful
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stderr=''
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(stdout, stderr, returncode) = ipautil.run(['/usr/bin/kvno',
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'host/%s' % options.master],
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env={'KRB5_CONFIG':KRB5_CONFIG, 'KRB5CCNAME':CCACHE_FILE},
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raiseonerr=False)
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if returncode != 0:
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raise RuntimeError("Could not get ticket for master server: %s" % stderr)
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remote_check_opts = ['--replica %s' % options.hostname]
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if options.check_ca:
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remote_check_opts.append('--check-ca')
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print_info("Execute check on remote master")
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stderr = ''
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remote_addr = "%s@%s" % (user, options.master)
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(stdout, stderr, returncode) = ipautil.run(['/usr/bin/ssh',
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'-q', '-o StrictHostKeychecking=no',
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'-o UserKnownHostsFile=/dev/null', remote_addr,
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"/usr/sbin/ipa-replica-conncheck " + " ".join(remote_check_opts)],
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env={'KRB5_CONFIG':KRB5_CONFIG, 'KRB5CCNAME' : CCACHE_FILE},
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raiseonerr=False)
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print_info(stdout)
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if returncode != 0:
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raise RuntimeError("Remote master check failed with following error message(s):\n%s" % stderr)
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else:
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# wait until user test is ready
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print_info("Listeners are started. Use CTRL+C to terminate the listening part after the test.")
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print_info("")
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print_info("Please run the following command on remote master:")
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remote_check_opts = ['--replica %s' % options.hostname]
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if options.check_ca:
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remote_check_opts.append('--check-ca')
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print_info("/usr/sbin/ipa-replica-conncheck " + " ".join(remote_check_opts))
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time.sleep(3600)
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print_info("Connection check timeout: terminating listening program")
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if __name__ == "__main__":
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try:
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sys.exit(main())
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except SystemExit, e:
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sys.exit(e)
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except KeyboardInterrupt:
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print_info("\nCleaning up...")
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sys.exit(1)
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except RuntimeError, e:
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sys.exit(e)
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finally:
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clean_responders(RESPONDERS)
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for file_name in (CCACHE_FILE, KRB5_CONFIG):
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if file_name:
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try:
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os.remove(file_name)
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except OSError:
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pass
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