freeipa/install/tools/ipa-adtrust-install

#! /usr/bin/python
#
# Authors: Sumit Bose <sbose@redhat.com>
# Based on ipa-server-install by Karl MacMillan <kmacmillan@mentalrootkit.com>
# and ipa-dns-install by Martin Nagy
#
# 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 ipaserver.plugins.ldap2 import ldap2
from ipaserver.install import adtrustinstance
from ipaserver.install.installutils import *
from ipaserver.install import service
from ipapython import version
from ipapython import ipautil, sysrestore
from ipalib import api, errors, util
from ipapython.config import IPAOptionParser
import krbV
import ldap
from ipapython.ipa_log_manager import *
from ipapython.dn import DN

log_file_name = "/var/log/ipaserver-install.log"

def parse_options():
    parser = IPAOptionParser(version=version.VERSION)
    parser.add_option("-d", "--debug", dest="debug", action="store_true",
                      default=False, help="print debugging information")
    parser.add_option("--ip-address", dest="ip_address",
                      type="ip", ip_local=True, help="Master Server IP Address")
    parser.add_option("--netbios-name", dest="netbios_name",
                      help="NetBIOS name of the IPA domain")
    parser.add_option("--no-msdcs", dest="no_msdcs", action="store_true",
                      default=False, help="Do not create DNS service records " \
                                          "for Windows in managed DNS server")
    parser.add_option("--rid-base", dest="rid_base", type=int, default=1000,
                      help="Start value for mapping UIDs and GIDs to RIDs")
    parser.add_option("--secondary-rid-base", dest="secondary_rid_base",
                      type=int, default=100000000,
                      help="Start value of the secondary range for mapping " \
                           "UIDs and GIDs to RIDs")
    parser.add_option("-U", "--unattended", dest="unattended", action="store_true",
                      default=False, help="unattended installation never prompts the user")
    parser.add_option("-a", "--admin-password",
                      sensitive=True, dest="admin_password",
                      help="admin user kerberos password")
    parser.add_option("-A", "--admin-name",
                      sensitive=True, dest="admin_name", default='admin',
                      help="admin user principal")

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

    return safe_options, options

def netbios_name_error(name):
    print "Illegal NetBIOS name [%s].\n" % name
    print "Up to 15 characters and only uppercase ASCII letter and digits are allowed."

def read_netbios_name(netbios_default):
    netbios_name = ""

    print "Enter the NetBIOS name for the IPA domain."
    print "Only up to 15 uppercase ASCII letters and digits are allowed."
    print "Example: EXAMPLE."
    print ""
    print ""
    if not netbios_default:
        netbios_default = "EXAMPLE"
    while True:
        netbios_name = ipautil.user_input("NetBIOS domain name", netbios_default, allow_empty = False)
        print ""
        if adtrustinstance.check_netbios_name(netbios_name):
            break

        netbios_name_error(netbios_name)

    return netbios_name

def read_admin_password(admin_name):
    print "Configuring cross-realm trusts for IPA server requires password for user '%s'." % (admin_name)
    print "This user is a regular system account used for IPA server administration."
    print ""
    admin_password = read_password(admin_name, confirm=False, validate=None)
    return admin_password

def ensure_admin_kinit(admin_name, admin_password):
    try:
        ipautil.run(['kinit', admin_name], stdin=admin_password+'\n')
    except ipautil.CalledProcessError, e:
        print "There was error to automatically re-kinit your admin user ticket."
        return False
    return True

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

    if os.getegid() != 0:
        sys.exit("Must be root to setup AD trusts on server")

    standard_logging_setup(log_file_name, debug=options.debug, filemode='a')
    print "\nThe log file for this installation can be found in %s" % log_file_name

    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")

    check_server_configuration()

    global fstore
    fstore = sysrestore.FileStore('/var/lib/ipa/sysrestore')

    print "=============================================================================="
    print "This program will setup components needed to establish trust to AD domains for"
    print "the FreeIPA Server."
    print ""
    print "This includes:"
    print "  * Configure Samba"
    print "  * Add trust related objects to FreeIPA LDAP server"
    #TODO:
    #print "  * Add a SID to all users and Posix groups"
    print ""
    print "To accept the default shown in brackets, press the Enter key."
    print ""

    # Check if samba packages are installed
    if not adtrustinstance.check_inst():
        sys.exit("Aborting installation.")

    # Initialize the ipalib api
    cfg = dict(
        in_server=True,
        debug=options.debug,
    )
    api.bootstrap(**cfg)
    api.finalize()

    if adtrustinstance.ipa_smb_conf_exists():
        if not options.unattended:
            while True:
                print "IPA generated smb.conf detected."
                if not ipautil.user_input("Overwrite smb.conf?", default = False, allow_empty = False):
                    sys.exit("Aborting installation.")
                break

    # Check we have a public IP that is associated with the hostname
    ip = None
    try:
        hostaddr = resolve_host(api.env.host)
        if len(hostaddr) > 1:
            print >> sys.stderr, "The server hostname resolves to more than one address:"
            for addr in hostaddr:
                print >> sys.stderr, "  %s" % addr

            if options.ip_address:
                if str(options.ip_address) not in hostaddr:
                    print >> sys.stderr, "Address passed in --ip-address did not match any resolved"
                    print >> sys.stderr, "address!"
                    sys.exit(1)
                print "Selected IP address:", str(options.ip_address)
                ip = options.ip_address
            else:
                if options.unattended:
                    print >> sys.stderr, "Please use --ip-address option to specify the address"
                    sys.exit(1)
                else:
                    ip = read_ip_address(api.env.host, fstore)
        else:
                ip = hostaddr and ipautil.CheckedIPAddress(hostaddr[0], match_local=True)
    except Exception, e:
        print "Error: Invalid IP Address %s: %s" % (ip, e)
        print "Aborting installation"
        sys.exit(1)

    ip_address = str(ip)
    root_logger.debug("will use ip_address: %s\n", ip_address)

    if not options.unattended:
        print ""
        print "The following operations may take some minutes to complete."
        print "Please wait until the prompt is returned."
        print ""

    # Create a Adtrust instance
    if options.unattended and not options.dm_password:
        sys.exit("\nIn unattended mode you need to provide at least the -p option")

    netbios_name = options.netbios_name
    if not netbios_name:
        netbios_name = adtrustinstance.make_netbios_name(api.env.domain)

    if not adtrustinstance.check_netbios_name(netbios_name):
        if options.unattended:
            netbios_name_error(netbios_name)
            sys.exit("Aborting installation.")
        else:
            netbios_name = None
            if options.netbios_name:
                netbios_name_error(options.netbios_name)

    if not options.unattended and ( not netbios_name or not options.netbios_name):
        netbios_name = read_netbios_name(netbios_name)

    admin_password = options.admin_password
    if not (options.unattended or admin_password):
        admin_password = read_admin_password(options.admin_name)

    admin_kinited = None
    if admin_password:
        admin_kinited = ensure_admin_kinit(options.admin_name, admin_password)
        if not admin_kinited:
            print "Proceeding with credentials that existed before"

    try:
        ctx = krbV.default_context()
        ccache = ctx.default_ccache()
        principal = ccache.principal()
    except krbV.Krb5Error, e:
        sys.exit("Must have Kerberos credentials to setup AD trusts on server")

    try:
        api.Backend.ldap2.connect(ccache.name)
    except errors.ACIError, e:
        sys.exit("Outdated Kerberos credentials. Use kdestroy and kinit to update your ticket")
    except errors.DatabaseError, e:
        sys.exit("Cannot connect to the LDAP database. Please check if IPA is running")

    try:
        user = api.Command.user_show(unicode(principal[0]))['result']
        group = api.Command.group_show(u'admins')['result']
        if not (user['uid'][0] in group['member_user'] and
                group['cn'][0] in user['memberof_group']):
            raise errors.RequirementError(name='admins group membership')
    except errors.RequirementError, e:
        sys.exit("Must have administrative privileges to setup AD trusts on server")
    except Exception, e:
        sys.exit("Unrecognized error during check of admin rights: %s" % (str(e)))

    smb = adtrustinstance.ADTRUSTInstance(fstore)
    smb.realm = api.env.realm
    smb.autobind = service.ENABLED
    smb.setup(api.env.host, ip_address, api.env.realm, api.env.domain,
              netbios_name, options.rid_base, options.secondary_rid_base,
              options.no_msdcs)
    smb.find_local_id_range()
    smb.create_instance()

    print """
=============================================================================
Setup complete

You must make sure these network ports are open:
\tTCP Ports:
\t  * 138: netbios-dgm
\t  * 139: netbios-ssn
\t  * 445: microsoft-ds
\tUDP Ports:
\t  * 138: netbios-dgm
\t  * 139: netbios-ssn
\t  * 389: (C)LDAP
\t  * 445: microsoft-ds

Additionally you have to make sure the FreeIPA LDAP server is not reachable
by any domain controller in the Active Directory domain by closing down
the following ports for these servers:
\tTCP Ports:
\t  * 389, 636: LDAP/LDAPS

You may want to choose to REJECT the network packets instead of DROPing
them to avoid timeouts on the AD domain controllers.

=============================================================================
"""
    if admin_password:
        admin_kinited = ensure_admin_kinit(options.admin_name, admin_password)

    if not admin_kinited:
        print """
WARNING: you MUST re-kinit admin user before using 'ipa trust-*' commands
family in order to re-generate Kerberos tickets to include AD-specific
information"""

    return 0

if __name__ == '__main__':
    run_script(main, log_file_name=log_file_name,
            operation_name='ipa-adtrust-install')