path: root/install/tools/ipa-replica-conncheck

#! /usr/bin/python2 -E
# Authors: Martin Kosek <mkosek@redhat.com>
#
# Copyright (C) 2011  Red Hat
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

from __future__ import print_function

from ipapython.config import IPAOptionParser
from ipapython import version
from ipapython import ipautil, certdb
from ipalib import api, errors, x509
from ipaserver.install import installutils
import ipaclient.ipachangeconf
from optparse import OptionGroup, OptionValueError
from ipapython.ipa_log_manager import root_logger, standard_logging_setup
import sys
import os
import signal
import tempfile
import socket
import time
import threading
import errno
from socket import SOCK_STREAM, SOCK_DGRAM
import distutils.spawn
from ipaplatform.paths import paths
import gssapi
from nss import nss

CONNECT_TIMEOUT = 5
RESPONDERS = [ ]
QUIET = False
CCACHE_FILE = None
KRB5_CONFIG = None

class SshExec(object):
    def __init__(self, user, addr):
        self.user = user
        self.addr = addr
        self.cmd = distutils.spawn.find_executable('ssh')

    def __call__(self, command, verbose=False):
        # Bail if ssh is not installed
        if self.cmd is None:
            print("WARNING: ssh not installed, skipping ssh test")
            return ('', '', 0)

        tmpf = tempfile.NamedTemporaryFile()
        cmd = [
            self.cmd,
            '-o StrictHostKeychecking=no',
            '-o UserKnownHostsFile=%s' % tmpf.name,
            '-o GSSAPIAuthentication=yes',
            '-o User=%s' % self.user,
            '%s' % self.addr,
            command
        ]
        if verbose:
            cmd.insert(1, '-v')

        env = dict()
        if KRB5_CONFIG is not None:
            env['KRB5_CONFIG'] = KRB5_CONFIG
        elif 'KRB5_CONFIG' in os.environ:
            env['KRB5_CONFIG'] = os.environ['KRB5_CONFIG']
        if CCACHE_FILE is not None:
            env['KRB5CCNAME'] = CCACHE_FILE
        elif 'KRB5CCNAME' in os.environ:
            env['KRB5CCNAME'] = os.environ['KRB5CCNAME']

        return ipautil.run(cmd, env=env, raiseonerr=False,
                           capture_output=True, capture_error=True)


class CheckedPort(object):
    def __init__(self, port, port_type, description):
        self.port = port
        self.port_type = port_type
        self.description = description

BASE_PORTS = [
                CheckedPort(389, SOCK_STREAM, "Directory Service: Unsecure port"),
                CheckedPort(636, SOCK_STREAM, "Directory Service: Secure port"),
                CheckedPort(88, SOCK_STREAM, "Kerberos KDC: TCP"),
                CheckedPort(88, SOCK_DGRAM, "Kerberos KDC: UDP"),
                CheckedPort(464, SOCK_STREAM, "Kerberos Kpasswd: TCP"),
                CheckedPort(464, SOCK_DGRAM, "Kerberos Kpasswd: UDP"),
                CheckedPort(80, SOCK_STREAM, "HTTP Server: Unsecure port"),
                CheckedPort(443, SOCK_STREAM, "HTTP Server: Secure port"),
             ]


def print_info(msg):
    if not QUIET:
        print(msg)

def parse_options():
    def ca_cert_file_callback(option, opt, value, parser):
        if not os.path.exists(value):
            raise OptionValueError(
                "%s option '%s' does not exist" % (opt, value))
        if not os.path.isfile(value):
            raise OptionValueError(
                "%s option '%s' is not a file" % (opt, value))
        if not os.path.isabs(value):
            raise OptionValueError(
                "%s option '%s' is not an absolute file path" % (opt, value))

        initialized = nss.nss_is_initialized()
        try:
            x509.load_certificate_list_from_file(value)
        except Exception:
            raise OptionValueError(
                "%s option '%s' is not a valid certificate file" %
                (opt, value))
        finally:
            if not initialized:
                nss.nss_shutdown()

        parser.values.ca_cert_file = value

    parser = IPAOptionParser(version=version.VERSION)

    replica_group = OptionGroup(parser, "on-replica options")
    replica_group.add_option("-m", "--master", dest="master",
                      help="Master address with running IPA for output connection check")
    replica_group.add_option("-a", "--auto-master-check", dest="auto_master_check",
                      action="store_true",
                      default=False,
                      help="Automatically execute connection check on master")
    replica_group.add_option("-r", "--realm", dest="realm",
                      help="Realm name")
    replica_group.add_option("-k", "--kdc", dest="kdc",
                      help="Master KDC. Defaults to master address")
    replica_group.add_option("-p", "--principal", dest="principal",
                      default=None, help="Principal to use to log in to remote master")
    replica_group.add_option("-w", "--password", dest="password", sensitive=True,
                      help="Password for the principal")
    replica_group.add_option("--ca-cert-file", dest="ca_cert_file",
                             type="string", action="callback",
                             callback=ca_cert_file_callback,
                             help="load the CA certificate from this file")
    parser.add_option_group(replica_group)


    master_group = OptionGroup(parser, "on-master options")
    master_group.add_option("-R", "--replica", dest="replica",
                      help="Address of remote replica machine to check against")
    parser.add_option_group(master_group)

    common_group = OptionGroup(parser, "common options")
    common_group.add_option("-c", "--check-ca", dest="check_ca",
                      action="store_true",
                      default=False,
                      help="Check also ports for Certificate Authority "
                        "(for servers installed before IPA 3.1)")

    common_group.add_option("", "--hostname", dest="hostname",
                      help="The hostname of this server (FQDN). "
                           "By default the result of getfqdn() call from "
                           "Python's socket module is used.")
    parser.add_option_group(common_group)

    parser.add_option("-d", "--debug", dest="debug",
                      action="store_true",
                      default=False, help="Print debugging information")
    parser.add_option("-q", "--quiet", dest="quiet",
                      action="store_true",
                      default=False, help="Output only errors")
    parser.add_option("--no-log", dest="log_to_file", action="store_false",
                      default=True, help="Do not log into file")

    options, _args = parser.parse_args()
    safe_options = parser.get_safe_opts(options)

    if options.master and options.replica:
        parser.error("on-master and on-replica options are mutually exclusive!")

    if options.master:
        if options.auto_master_check and not options.realm:
            parser.error("Realm is parameter is required to connect to remote master!")
        if not os.getegid() == 0:
            parser.error("You can only run on-replica part as root.")

    if options.master and not options.kdc:
       options.kdc = options.master

    if not options.master and not options.replica:
       parser.error("No action: you should select either --replica or --master option.")

    if not options.hostname:
        options.hostname = socket.getfqdn()

    if options.quiet:
        global QUIET
        QUIET = True

    return safe_options, options

def logging_setup(options):
    log_file = None

    if os.getegid() == 0 and options.log_to_file:
        log_file = paths.IPAREPLICA_CONNCHECK_LOG

    standard_logging_setup(log_file, debug=options.debug)

def clean_responders(responders):
    if not responders:
        return

    for responder in responders:
        responder.stop()

    for responder in responders:
        responder.join()
        responders.remove(responder)

def sigterm_handler(signum, frame):
    # do what SIGINT does (raise a KeyboardInterrupt)
    sigint_handler = signal.getsignal(signal.SIGINT)
    if callable(sigint_handler):
        sigint_handler(signum, frame)

def configure_krb5_conf(realm, kdc, filename):

    krbconf = ipaclient.ipachangeconf.IPAChangeConf("IPA Installer")
    krbconf.setOptionAssignment((" = ", " "))
    krbconf.setSectionNameDelimiters(("[","]"))
    krbconf.setSubSectionDelimiters(("{","}"))
    krbconf.setIndent(("","  ","    "))

    opts = [{'name':'comment', 'type':'comment', 'value':'File created by ipa-replica-conncheck'},
            {'name':'empty', 'type':'empty'}]

    #[libdefaults]
    libdefaults = [{'name':'default_realm', 'type':'option', 'value':realm}]
    libdefaults.append({'name':'dns_lookup_realm', 'type':'option', 'value':'false'})
    libdefaults.append({'name':'dns_lookup_kdc', 'type':'option', 'value':'true'})
    libdefaults.append({'name':'rdns', 'type':'option', 'value':'false'})
    libdefaults.append({'name':'ticket_lifetime', 'type':'option', 'value':'24h'})
    libdefaults.append({'name':'forwardable', 'type':'option', 'value':'true'})
    libdefaults.append({'name':'udp_preference_limit', 'type':'option', 'value':'0'})

    opts.append({'name':'libdefaults', 'type':'section', 'value': libdefaults})
    opts.append({'name':'empty', 'type':'empty'})

    #the following are necessary only if DNS discovery does not work
    #[realms]
    realms_info =[{'name':'kdc', 'type':'option', 'value':ipautil.format_netloc(kdc, 88)},
                 {'name':'master_kdc', 'type':'option', 'value':ipautil.format_netloc(kdc, 88)},
                 {'name':'admin_server', 'type':'option', 'value':ipautil.format_netloc(kdc, 749)}]
    realms = [{'name':realm, 'type':'subsection', 'value':realms_info}]

    opts.append({'name':'realms', 'type':'section', 'value':realms})
    opts.append({'name':'empty', 'type':'empty'})

    #[appdefaults]
    pamopts = [{'name':'debug', 'type':'option', 'value':'false'},
               {'name':'ticket_lifetime', 'type':'option', 'value':'36000'},
               {'name':'renew_lifetime', 'type':'option', 'value':'36000'},
               {'name':'forwardable', 'type':'option', 'value':'true'},
               {'name':'krb4_convert', 'type':'option', 'value':'false'}]
    appopts = [{'name':'pam', 'type':'subsection', 'value':pamopts}]
    opts.append({'name':'appdefaults', 'type':'section', 'value':appopts})

    root_logger.debug("Writing temporary Kerberos configuration to %s:\n%s"
                              % (filename, krbconf.dump(opts)))

    krbconf.newConf(filename, opts)

class PortResponder(threading.Thread):

    def __init__(self, port, port_type, socket_timeout=1):
        super(PortResponder, self).__init__()
        self.port = port
        self.port_type = port_type
        self.socket_timeout = socket_timeout
        self._stop_request = False

    def run(self):
        while not self._stop_request:
            try:
                ipautil.bind_port_responder(self.port,
                        self.port_type,
                        socket_timeout=self.socket_timeout,
                        responder_data="FreeIPA")
            except socket.timeout:
                pass
            except socket.error as e:
                if e.errno == errno.EADDRINUSE:
                    time.sleep(1)
                else:
                    raise

    def stop(self):
        self._stop_request = True

def port_check(host, port_list):
    ports_failed = []
    ports_udp_warning = []  # conncheck could not verify that port is open
    for port in port_list:
        try:
            port_open = ipautil.host_port_open(host, port.port,
                    port.port_type, socket_timeout=CONNECT_TIMEOUT)
        except socket.gaierror:
            raise RuntimeError("Port check failed! Unable to resolve host name '%s'" % host)
        if port_open:
            result = "OK"
        else:
            if port.port_type == socket.SOCK_DGRAM:
                ports_udp_warning.append(port)
                result = "WARNING"
            else:
                ports_failed.append(port)
                result = "FAILED"
        print_info("   %s (%d): %s" % (port.description, port.port, result))

    if ports_udp_warning:
        print("The following UDP ports could not be verified as open: %s" \
                % ", ".join(str(port.port) for port in ports_udp_warning))
        print("This can happen if they are already bound to an application")
        print("and ipa-replica-conncheck cannot attach own UDP responder.")

    if ports_failed:
        msg_ports = []
        for port in ports_failed:
            port_type_text = "TCP" if port.port_type == SOCK_STREAM else "UDP"
            msg_ports.append('%d (%s)' % (port.port, port_type_text))
        raise RuntimeError("Port check failed! Inaccessible port(s): %s" \
                % ", ".join(msg_ports))

def main():
    safe_options, options = parse_options()

    logging_setup(options)
    root_logger.debug('%s was invoked with options: %s' % (sys.argv[0], safe_options))
    root_logger.debug("missing options might be asked for interactively later\n")
    root_logger.debug('IPA version %s' % version.VENDOR_VERSION)

    signal.signal(signal.SIGTERM, sigterm_handler)

    required_ports = BASE_PORTS
    if options.check_ca:
        # Check old Dogtag CA replication port
        # New installs with unified databases use main DS port (checked above)
        required_ports.append(CheckedPort(7389, SOCK_STREAM,
                                          "PKI-CA: Directory Service port"))

    if options.replica:
        print_info("Check connection from master to remote replica '%s':" % options.replica)
        port_check(options.replica, required_ports)
        print_info("\nConnection from master to replica is OK.")

    # kinit to foreign master
    if options.master:
        # check ports on master first
        print_info("Check connection from replica to remote master '%s':" % options.master)
        tcp_ports = [ port for port in required_ports if port.port_type == SOCK_STREAM ]
        udp_ports = [ port for port in required_ports if port.port_type == SOCK_DGRAM ]
        port_check(options.master, tcp_ports)

        if udp_ports:
            print_info("\nThe following list of ports use UDP protocol and would need to be")
            print_info("checked manually:")
            for port in udp_ports:
                result = "SKIPPED"
                print_info("   %s (%d): %s" % (port.description, port.port, result))

        print_info("\nConnection from replica to master is OK.")

        # create listeners
        print_info("Start listening on required ports for remote master check")

        for port in required_ports:
            root_logger.debug("Start listening on port %d (%s)" % (port.port, port.description))
            responder = PortResponder(port.port, port.port_type)
            responder.start()
            RESPONDERS.append(responder)

        remote_check_opts = ['--replica %s' % options.hostname]

        if options.auto_master_check:
            print_info("Get credentials to log in to remote master")
            cred = None
            if options.principal is None:
                # Check if ccache is available
                try:
                    root_logger.debug('KRB5CCNAME set to %s' %
                                      os.environ.get('KRB5CCNAME', None))
                    # get default creds, will raise if none found
                    cred = gssapi.creds.Credentials()
                    principal = str(cred.name)
                except gssapi.raw.misc.GSSError as e:
                    root_logger.debug('Failed to find default ccache: %s' % e)
                    # Use admin as the default principal
                    principal = "admin"
            else:
                principal = options.principal

            if cred is None:
                (krb_fd, krb_name) = tempfile.mkstemp()
                os.close(krb_fd)
                configure_krb5_conf(options.realm, options.kdc, krb_name)
                global KRB5_CONFIG
                KRB5_CONFIG = krb_name
                (ccache_fd, ccache_name) = tempfile.mkstemp()
                os.close(ccache_fd)
                global CCACHE_FILE
                CCACHE_FILE = ccache_name

                if principal.find('@') == -1:
                    principal = '%s@%s' % (principal, options.realm)

                if options.password:
                    password=options.password
                else:
                    password = installutils.read_password(principal, confirm=False,
                               validate=False, retry=False)
                    if password is None:
                        sys.exit("Principal password required")


                result = ipautil.run([paths.KINIT, principal],
                     env={'KRB5_CONFIG':KRB5_CONFIG, 'KRB5CCNAME':CCACHE_FILE},
                    stdin=password, raiseonerr=False, capture_error=True)
                if result.returncode != 0:
                    raise RuntimeError("Cannot acquire Kerberos ticket: %s" %
                                        result.error_output)

                # Verify kinit was actually successful
                result = ipautil.run([paths.BIN_KVNO,
                     'host/%s' % options.master],
                    env={'KRB5_CONFIG':KRB5_CONFIG, 'KRB5CCNAME':CCACHE_FILE},
                    raiseonerr=False, capture_error=True)
                if result.returncode != 0:
                    raise RuntimeError("Could not get ticket for master server: %s" %
                                        result.error_output)

            try:
                print_info("Check RPC connection to remote master")

                xmlrpc_uri = ('https://%s/ipa/xml' %
                              ipautil.format_netloc(options.master))

                if options.ca_cert_file:
                    nss_dir = None
                else:
                    nss_dir = paths.IPA_NSSDB_DIR

                with certdb.NSSDatabase(nss_dir) as nss_db:
                    if options.ca_cert_file:
                        nss_dir = nss_db.secdir

                        password = ipautil.ipa_generate_password()
                        password_file = ipautil.write_tmp_file(password)
                        nss_db.create_db(password_file.name)

                        ca_certs = x509.load_certificate_list_from_file(
                            options.ca_cert_file, dbdir=nss_db.secdir)
                        for ca_cert in ca_certs:
                            nss_db.add_cert(
                                ca_cert.der_data, str(ca_cert.subject), 'C,,')
                            del ca_cert
                        del ca_certs
                    else:
                        nss_dir = None

                    api.bootstrap(context='client', xmlrpc_uri=xmlrpc_uri,
                                  nss_dir=nss_db.secdir)
                    api.finalize()
                    try:
                        api.Backend.rpcclient.connect()
                        api.Command.ping()
                    except Exception as e:
                        print_info(
                            "Could not connect to the remote host: %s" % e)
                        raise

                    print_info("Execute check on remote master")
                    try:
                        result = api.Backend.rpcclient.forward(
                            'server_conncheck',
                            ipautil.fsdecode(options.master),
                            ipautil.fsdecode(options.hostname),
                            version=u'2.162',
                        )
                    except (errors.CommandError, errors.NetworkError) as e:
                        print_info(
                            "Remote master does not support check over RPC: "
                            "%s" % e)
                        raise
                    except errors.PublicError as e:
                        returncode = 1
                        stderr = e
                    else:
                        for message in result['messages']:
                            print_info(message['message'])
                        returncode = int(not result['result'])
                        stderr = ("ipa-replica-conncheck returned non-zero "
                                  "exit code")
                    finally:
                        if api.Backend.rpcclient.isconnected():
                            api.Backend.rpcclient.disconnect()
            except Exception:
                print_info("Retrying using SSH...")

                # Ticket 5812 Always qualify requests for admin
                user = principal
                ssh = SshExec(user, options.master)

                print_info("Check SSH connection to remote master")
                result = ssh('echo OK', verbose=True)
                if result.returncode != 0:
                    print('Could not SSH into remote host. Error output:')
                    for line in result.error_output.splitlines():
                        print('    %s' % line)
                    raise RuntimeError('Could not SSH to remote host.')

                print_info("Execute check on remote master")
                result = ssh(
                    "/usr/sbin/ipa-replica-conncheck " +
                        " ".join(remote_check_opts))
                returncode = result.returncode
                stderr = result.error_output
                print_info(result.output)
            if returncode != 0:
                raise RuntimeError("Remote master check failed with following error message(s):\n%s" % stderr)
        else:
            # wait until user  test is ready
            print_info("Listeners are started. Use CTRL+C to terminate the listening part after the test.")
            print_info("")
            print_info("Please run the following command on remote master:")

            print_info("/usr/sbin/ipa-replica-conncheck " + " ".join(remote_check_opts))
            time.sleep(3600)
            print_info("Connection check timeout: terminating listening program")

if __name__ == "__main__":
    try:
        sys.exit(main())
    except SystemExit as e:
        sys.exit(e)
    except KeyboardInterrupt:
        print_info("\nCleaning up...")
        sys.exit(1)
    except RuntimeError as e:
        sys.exit(e)
    finally:
        clean_responders(RESPONDERS)
        for file_name in (CCACHE_FILE, KRB5_CONFIG):
            if file_name:
                try:
                    os.remove(file_name)
                except OSError:
                    pass