freeipa/install/tools/ipa-replica-install

#! /usr/bin/python -E
# Authors: Karl MacMillan <kmacmillan@mentalrootkit.com>
#
# Copyright (C) 2007  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/>.
#

import sys
import socket

import tempfile, os, pwd, traceback, logging, shutil
import grp
from ConfigParser import SafeConfigParser

from ipapython import ipautil

from ipaserver.install import dsinstance, installutils, krbinstance, service
from ipaserver.install import bindinstance, httpinstance, ntpinstance, certs
from ipaserver.install.replication import check_replication_plugin
from ipaserver.install.installutils import HostnameLocalhost, resolve_host
from ipaserver.plugins.ldap2 import ldap2
from ipapython import version
from ipalib import api, errors, util
from ipapython.config import IPAOptionParser
from ipapython import sysrestore

CACERT="/etc/ipa/ca.crt"
REPLICA_INFO_TOP_DIR=None

class ReplicaConfig:
    def __init__(self):
        self.realm_name = ""
        self.domain_name = ""
        self.master_host_name = ""
        self.dirman_password = ""
        self.host_name = ""
        self.dir = ""
        self.subject_base = ""

def parse_options():
    usage = "%prog [options] REPLICA_FILE"
    parser = IPAOptionParser(usage=usage, version=version.VERSION)
    parser.add_option("-N", "--no-ntp", dest="conf_ntp", action="store_false",
                      help="do not configure ntp", default=True)
    parser.add_option("-d", "--debug", dest="debug", action="store_true",
                      default=False, help="gather extra debugging information")
    parser.add_option("-p", "--password", dest="password", sensitive=True,
                      help="Directory Manager (existing master) password")
    parser.add_option("-w", "--admin-password", dest="admin_password", sensitive=True,
                      help="Admin user Kerberos password used for connection check")
    parser.add_option("--setup-dns", dest="setup_dns", action="store_true",
                      default=False, help="configure bind with our zone")
    parser.add_option("--forwarder", dest="forwarders", action="append",
                      type="ip", help="Add a DNS forwarder")
    parser.add_option("--no-forwarders", dest="no_forwarders", action="store_true",
                      default=False, help="Do not add any DNS forwarders, use root servers instead")
    parser.add_option("--no-reverse", dest="no_reverse", action="store_true",
                      default=False, help="Do not create reverse DNS zone")
    parser.add_option("--no-host-dns", dest="no_host_dns", action="store_true",
                      default=False,
                      help="Do not use DNS for hostname lookup during installation")
    parser.add_option("--no-pkinit", dest="setup_pkinit", action="store_false",
                      default=True, help="disables pkinit setup steps")
    parser.add_option("--skip-conncheck", dest="skip_conncheck", action="store_true",
                      default=False, help="skip connection check to remote master")
    parser.add_option("-U", "--unattended", dest="unattended", action="store_true",
                      default=False, help="unattended installation never prompts the user")

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

    if len(args) != 1:
        parser.error("you must provide a file generated by ipa-replica-prepare")

    if not options.setup_dns:
        if options.forwarders:
            parser.error("You cannot specify a --forwarder option without the --setup-dns option")
        if options.no_forwarders:
            parser.error("You cannot specify a --no-forwarders option without the --setup-dns option")
        if options.no_reverse:
            parser.error("You cannot specify a --no-reverse option without the --setup-dns option")
    elif options.forwarders and options.no_forwarders:
        parser.error("You cannot specify a --forwarder option together with --no-forwarders")
    elif not options.forwarders and not options.no_forwarders:
        parser.error("You must specify at least one --forwarder option or --no-forwarders option")

    return safe_options, options, args[0]

def get_dirman_password():
    return installutils.read_password("Directory Manager (existing master)", confirm=False, validate=False)

def expand_info(filename, password):
    top_dir = tempfile.mkdtemp("ipa")
    tarfile = top_dir+"/files.tar"
    dir = top_dir + "/realm_info"
    ipautil.decrypt_file(filename, tarfile, password, top_dir)
    ipautil.run(["tar", "xf", tarfile, "-C", top_dir])
    os.remove(tarfile)

    return top_dir, dir

def read_info(dir, rconfig):
    filename = dir + "/realm_info"
    fd = open(filename)
    config = SafeConfigParser()
    config.readfp(fd)

    rconfig.realm_name = config.get("realm", "realm_name")
    rconfig.master_host_name = config.get("realm", "master_host_name")
    rconfig.domain_name = config.get("realm", "domain_name")
    rconfig.host_name = config.get("realm", "destination_host")
    rconfig.subject_base = config.get("realm", "subject_base")

def get_host_name(no_host_dns):
    hostname = installutils.get_fqdn()
    try:
        installutils.verify_fqdn(hostname, no_host_dns)
    except RuntimeError, e:
        logging.error(str(e))
        sys.exit(1)

    return hostname

def set_owner(config, dir):
    pw = pwd.getpwnam(dsinstance.DS_USER)
    os.chown(dir, pw.pw_uid, pw.pw_gid)

def install_ca(config):
    # FIXME, need to pass along the CA plugin to use
    cafile = config.dir + "/cacert.p12"

    if not ipautil.file_exists(cafile):
        # CA not used on the server, return empty instances
        return (None, None)

    try:
        from ipaserver.install import cainstance
    except ImportError:
        print >> sys.stderr, "Import failed: %s" % sys.exc_value
        sys.exit(1)

    if not cainstance.check_inst():
        print "A CA was specified but the dogtag certificate server"
        print "is not installed on the system"
        print "Please install dogtag and restart the setup program"
        sys.exit(1)

    pkcs12_info = None
    if ipautil.file_exists(config.dir + "/dogtagcert.p12"):
        pkcs12_info = (config.dir + "/dogtagcert.p12",
                       config.dir + "/dirsrv_pin.txt")
    cs = cainstance.CADSInstance()
    cs.create_instance(config.realm_name, config.host_name,
                       config.domain_name, config.dirman_password,
                       pkcs12_info)
    cs.load_pkcs12()
    cs.enable_ssl()
    cs.restart_instance()
    ca = cainstance.CAInstance(config.realm_name, certs.NSS_DIR)
    ca.configure_instance(config.host_name, config.dirman_password,
                          config.dirman_password, pkcs12_info=(cafile,),
                          master_host=config.master_host_name,
                          subject_base=config.subject_base)

    # The dogtag DS instance needs to be restarted after installation.
    # The procedure for this is: stop dogtag, stop DS, start DS, start
    # dogtag
    #
    # The service_name trickery is due to the service naming we do
    # internally. In the case of the dogtag DS the name doesn't match the
    # unix service.

    service_name = cs.service_name
    service.print_msg("Restarting the directory and certificate servers")
    cs.service_name = "dirsrv"
    ca.stop()
    cs.stop("PKI-IPA")
    cs.start("PKI-IPA")
    ca.start()
    cs.service_name = service_name

    return (ca, cs)

def install_replica_ds(config):
    dsinstance.check_existing_installation()
    dsinstance.check_ports()

    # if we have a pkcs12 file, create the cert db from
    # that. Otherwise the ds setup will create the CA
    # cert
    pkcs12_info = None
    if ipautil.file_exists(config.dir + "/dscert.p12"):
        pkcs12_info = (config.dir + "/dscert.p12",
                       config.dir + "/dirsrv_pin.txt")

    ds = dsinstance.DsInstance()
    ds.create_replica(config.realm_name,
                      config.master_host_name, config.host_name,
                      config.domain_name, config.dirman_password,
                      pkcs12_info)

    return ds

def install_krb(config, setup_pkinit=False):
    krb = krbinstance.KrbInstance()
    ldappwd_filename = config.dir + "/ldappwd"
    kpasswd_filename = config.dir + "/kpasswd.keytab"

    #pkinit files
    pkcs12_info = None
    if ipautil.file_exists(config.dir + "/pkinitcert.p12"):
        pkcs12_info = (config.dir + "/pkinitcert.p12",
                       config.dir + "/pkinit_pin.txt")

    krb.create_replica(config.realm_name,
                       config.master_host_name, config.host_name,
                       config.domain_name, config.dirman_password,
                       ldappwd_filename, kpasswd_filename,
                       setup_pkinit, pkcs12_info)

def install_ca_cert(config):
    cafile = config.dir + "/ca.crt"
    if not ipautil.file_exists(cafile):
        raise RuntimeError("Ca cert file is not available")

    try:
        shutil.copy(cafile, CACERT)
        os.chmod(CACERT, 0444)
    except Exception, e:
        print "error copying files: " + str(e)
        sys.exit(1)

def install_http(config):
    # if we have a pkcs12 file, create the cert db from
    # that. Otherwise the ds setup will create the CA
    # cert
    pkcs12_info = None
    if ipautil.file_exists(config.dir + "/httpcert.p12"):
        pkcs12_info = (config.dir + "/httpcert.p12",
                       config.dir + "/http_pin.txt")

    http = httpinstance.HTTPInstance()
    http.create_instance(config.realm_name, config.host_name, config.domain_name, config.dirman_password, False, pkcs12_info, self_signed_ca=True)

    # Now copy the autoconfiguration files
    if ipautil.file_exists(config.dir + "/preferences.html"):
        try:
            shutil.copy(config.dir + "/preferences.html", "/usr/share/ipa/html/preferences.html")
            shutil.copy(config.dir + "/configure.jar", "/usr/share/ipa/html/configure.jar")
        except Exception, e:
            print "error copying files: " + str(e)
            sys.exit(1)

def install_bind(config, options):
    api.Backend.ldap2.connect(bind_dn="cn=Directory Manager",
                              bind_pw=config.dirman_password)
    if options.forwarders:
        forwarders = options.forwarders
    else:
        forwarders = ()
    bind = bindinstance.BindInstance(dm_password=config.dirman_password)
    ip_address = resolve_host(config.host_name)
    if not ip_address:
        sys.exit("Unable to resolve IP address for host name")
    ip = installutils.parse_ip_address(ip_address)
    ip_address = str(ip)
    ip_prefixlen = ip.prefixlen

    create_reverse = True
    if options.unattended:
        # In unattended mode just use the cmdline flag
        create_reverse = not options.no_reverse
    else:
        if options.no_reverse:
            create_reverse = False
        else:
            # In interactive mode, if the flag was not explicitly 
            # specified, ask the user
            create_reverse = bindinstance.create_reverse()

    bind.setup(config.host_name, ip_address, ip_prefixlen, config.realm_name,
               config.domain_name, forwarders, options.conf_ntp, create_reverse)
    bind.create_instance()

def install_dns_records(config, options):

    if not bindinstance.dns_container_exists(config.master_host_name,
                                             util.realm_to_suffix(config.realm_name)):
        return

    # We have to force to connect to the remote master because we do this step
    # before our DS server is installed.
    cur_uri = api.Backend.ldap2.ldap_uri
    object.__setattr__(api.Backend.ldap2, 'ldap_uri',
                       'ldaps://%s' % config.master_host_name)
    api.Backend.ldap2.connect(bind_dn="cn=Directory Manager",
                              bind_pw=config.dirman_password,
                              tls_cacertfile=CACERT)
    bind = bindinstance.BindInstance(dm_password=config.dirman_password)
    ip_address = resolve_host(config.host_name)
    if not ip_address:
        sys.exit("Unable to resolve IP address for host name")
    ip = installutils.parse_ip_address(ip_address)
    ip_address = str(ip)
    ip_prefixlen = ip.prefixlen

    bind.add_master_dns_records(config.host_name, ip_address, ip_prefixlen,
                                config.realm_name, config.domain_name,
                                options.conf_ntp)

    #set it back to the default
    api.Backend.ldap2.disconnect()
    object.__setattr__(api.Backend.ldap2, 'ldap_uri', cur_uri)

def check_dirsrv():
    serverids = dsinstance.check_existing_installation()
    if serverids:
        print ""
        print "An existing Directory Server has been detected."
        if not ipautil.user_input("Do you wish to remove it and create a new one?", False):
            print ""
            print "Only a single Directory Server instance is allowed on an IPA"
            print "server, the one used by IPA itself."
            sys.exit(1)

        try:
            service.stop("dirsrv")
        except:
            pass

        for serverid in serverids:
            dsinstance.erase_ds_instance_data(serverid)

    (ds_unsecure, ds_secure) = dsinstance.check_ports()
    if not ds_unsecure or not ds_secure:
        print "IPA requires ports 389 and 636 for the Directory Server."
        print "These are currently in use:"
        if not ds_unsecure:
            print "\t389"
        if not ds_secure:
            print "\t636"
        sys.exit(1)

def check_bind():
    if not bindinstance.check_inst(unattended=True):
        print "Aborting installation"
        sys.exit(1)

def main():
    if not check_replication_plugin():
        sys.exit(1)
    safe_options, options, filename = parse_options()
    installutils.standard_logging_setup("/var/log/ipareplica-install.log", options.debug)
    logging.debug('%s was invoked with argument "%s" and options: %s' % (sys.argv[0], filename, safe_options))

    if not ipautil.file_exists(filename):
        sys.exit("Replica file %s does not exist" % filename)

    client_fstore = sysrestore.FileStore('/var/lib/ipa-client/sysrestore')
    if client_fstore.has_files():
        sys.exit("IPA client is already configured on this system.\n"
                 + "Please uninstall it first before configuring the replica.")

    global sstore
    sstore = sysrestore.StateFile('/var/lib/ipa/sysrestore')

    # check the bind is installed
    if options.setup_dns:
        check_bind()

    check_dirsrv()

    # get the directory manager password
    dirman_password = options.password
    if not dirman_password:
        try:
            dirman_password = get_dirman_password()
        except KeyboardInterrupt:
            sys.exit(0)

    try:
        top_dir, dir = expand_info(filename, dirman_password)
        global REPLICA_INFO_TOP_DIR
        REPLICA_INFO_TOP_DIR = top_dir
    except Exception, e:
        print "ERROR: Failed to decrypt or open the replica file."
        print "Verify you entered the correct Directory Manager password."
        sys.exit(1)

    config = ReplicaConfig()
    read_info(dir, config)
    config.dirman_password = dirman_password
    host = get_host_name(options.no_host_dns)
    if config.host_name != host:
        try:
            print "This replica was created for '%s' but this machine is named '%s'" % (config.host_name, host)
            if not ipautil.user_input("This may cause problems. Continue?", True):
                sys.exit(0)
            config.host_name = host
            print ""
        except KeyboardInterrupt:
            sys.exit(0)
    config.dir = dir


    # check connection
    if not options.skip_conncheck:
        print "Run connection check to master"
        args = ["/usr/sbin/ipa-replica-conncheck", "--master", config.master_host_name,
                "--auto-master-check", "--realm", config.realm_name,
                "--principal", "admin",
                "--hostname", config.host_name]

        if options.admin_password:
            args.extend(["--password", options.admin_password])

        cafile = config.dir + "/cacert.p12"
        if ipautil.file_exists(cafile): # with CA
            args.append('--check-ca')
        logging.debug("Running ipa-replica-conncheck with following arguments: %s" %
                " ".join(args))
        (stdin, stderr, returncode) = ipautil.run(args,raiseonerr=False, capture_output=False)

        if returncode != 0:
            sys.exit("Connection check failed!" +
                     "\nPlease fix your network settings according to error messages above." +
                     "\nIf the check results are not valid it can be skipped with --skip-conncheck parameter.")
        else:
            print "Connection check OK"

    # Create the management framework config file
    # Note: We must do this before bootstraping and finalizing ipalib.api
    old_umask = os.umask(022)   # must be readable for httpd
    try:
        fd = open("/etc/ipa/default.conf", "w")
        fd.write("[global]\n")
        fd.write("host=" + config.host_name + "\n")
        fd.write("basedn=" + util.realm_to_suffix(config.realm_name) + "\n")
        fd.write("realm=" + config.realm_name + "\n")
        fd.write("domain=" + config.domain_name + "\n")
        fd.write("xmlrpc_uri=https://%s/ipa/xml\n" % config.host_name)
        fd.write("ldap_uri=ldapi://%%2fvar%%2frun%%2fslapd-%s.socket\n" % dsinstance.realm_to_serverid(config.realm_name))
        if ipautil.file_exists(config.dir + "/cacert.p12"):
            fd.write("enable_ra=True\n")
            fd.write("ra_plugin=dogtag\n")
        fd.write("mode=production\n")
        fd.close()
    finally:
        os.umask(old_umask)

    api.bootstrap(in_server=True)
    api.finalize()

    # Create DS group if it doesn't exist yet
    try:
        grp.getgrnam(dsinstance.DS_GROUP)
        logging.debug("ds group %s exists" % dsinstance.DS_GROUP)
        group_exists = True
    except KeyError:
        group_exists = False
        args = ["/usr/sbin/groupadd", "-r", dsinstance.DS_GROUP]
        try:
            ipautil.run(args)
            logging.debug("done adding DS group")
        except ipautil.CalledProcessError, e:
            logging.critical("failed to add DS group: %s" % e)
    sstore.backup_state("install", "group_exists", group_exists)

    #Automatically disable pkinit w/ dogtag until that is supported
    #[certs.ipa_self_signed() must be called only after api.finalize()]
    if not ipautil.file_exists(config.dir + "/pkinitcert.p12") and not certs.ipa_self_signed():
        options.setup_pkinit = False

    # Install CA cert so that we can do SSL connections with ldap
    install_ca_cert(config)

    # Try out the password
    ldapuri = 'ldaps://%s' % config.master_host_name
    try:
        conn = ldap2(shared_instance=False, ldap_uri=ldapuri, base_dn='')
        conn.connect(bind_dn='cn=directory manager',
                     bind_pw=config.dirman_password,
                     tls_cacertfile=CACERT)
        try:
            entry = conn.find_entries(u'fqdn=%s' % host, ['dn', 'fqdn'], u'%s,%s' % (api.env.container_host, api.env.basedn))
            print "The host %s already exists on the master server. Depending on your configuration, you may perform the following:\n" % host
            print "Remove the replication agreement, if any:"
            print "    %% ipa-replica-manage del %s" % host
            print "Remove the host entry:"
            print "    %% ipa host-del %s" % host
            sys.exit(3)
        except errors.NotFound:
            pass
        conn.disconnect()
    except errors.ACIError:
        sys.exit("\nThe password provided is incorrect for LDAP server %s" % config.master_host_name)
    except errors.LDAPError:
        sys.exit("\nUnable to connect to LDAP server %s" % config.master_host_name)

    # Configure ntpd
    if options.conf_ntp:
        ntp = ntpinstance.NTPInstance()
        ntp.create_instance()

    # Configure the CA if necessary
    (CA, cs) = install_ca(config)

    # Always try to install DNS records
    install_dns_records(config, options)

    # Configure dirsrv
    ds = install_replica_ds(config)

    # We need to ldap_enable the CA now that DS is up and running
    if CA:
        CA.ldap_enable('CA', config.host_name, config.dirman_password,
                       util.realm_to_suffix(config.realm_name))
        cs.add_simple_service('dogtagldap/%s@%s' % (config.host_name, config.realm_name))
        cs.add_cert_to_service()

    install_krb(config, setup_pkinit=options.setup_pkinit)
    install_http(config)
    if CA:
        CA.import_ra_cert(dir + "/ra.p12")
        CA.fix_ra_perms()
        service.restart("httpd")
        service.print_msg("Setting the certificate subject base")
        CA.set_subject_in_config(util.realm_to_suffix(config.realm_name))

    # The DS instance is created before the keytab, add the SSL cert we
    # generated
    ds.add_cert_to_service()

    # Apply any LDAP updates. Needs to be done after the replica is synced-up
    service.print_msg("Applying LDAP updates")
    ds.apply_updates()

    service.restart("dirsrv")
    service.restart("krb5kdc")
    service.restart("httpd")

    if options.setup_dns:
        install_bind(config, options)

    # Call client install script
    try:
        ipautil.run(["/usr/sbin/ipa-client-install", "--on-master", "--unattended", "--domain", config.domain_name, "--server", config.host_name, "--realm", config.realm_name])
    except Exception, e:
        print "Configuration of client side components failed!"
        print "ipa-client-install returned: " + str(e)
        raise RuntimeError("Failed to configure the client")

    ds.replica_populate()
    ds.init_memberof()

    #Everything installed properly, activate ipa service.
    service.chkconfig_on('ipa')

try:
    if not os.geteuid()==0:
        sys.exit("\nYou must be root to run this script.\n")

    main()
    sys.exit(0)
except SystemExit, e:
    sys.exit(e)
except socket.error, (errno, errstr):
    print errstr
except HostnameLocalhost:
    print "The hostname resolves to the localhost address (127.0.0.1/::1)"
    print "Please change your /etc/hosts file so that the hostname"
    print "resolves to the ip address of your network interface."
    print ""
    print "Please fix your /etc/hosts file and restart the setup program"
except Exception, e:
    print "creation of replica failed: %s" % str(e)
    message = str(e)
    for str in traceback.format_tb(sys.exc_info()[2]):
        message = message + "\n" + str
    logging.debug(message)
except KeyboardInterrupt:
    print "Installation cancelled." 
finally:
    # always try to remove decrypted replica file
    try:
        if REPLICA_INFO_TOP_DIR:
            shutil.rmtree(REPLICA_INFO_TOP_DIR)
    except OSError:
        pass

print ""
print "Your system may be partly configured." 
print "Run /usr/sbin/ipa-server-install --uninstall to clean up."

# the only way to get here is on error or ^C
sys.exit(1)