#!/usr/bin/env python
# vim: expandtab
#
# Copyright (C) Matthieu Patou <mat@matws.net> 2009
#
# Based on provision a Samba4 server by
# Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2007-2008
# Copyright (C) Andrew Bartlett <abartlet@samba.org> 2008
#
#
# 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 shutil
import optparse
import os
import sys
import tempfile
# Allow to run from s4 source directory (without installing samba)
sys.path.insert(0, "bin/python")

import samba
import samba.getopt as options
from samba.credentials import DONT_USE_KERBEROS
from samba.auth import system_session, admin_session
from samba import Ldb, version
from ldb import SCOPE_SUBTREE, SCOPE_BASE, \
                FLAG_MOD_REPLACE, FLAG_MOD_ADD, FLAG_MOD_DELETE,\
                MessageElement, Message, Dn
from samba import param
from samba.misc import messageEltFlagToString
from samba.provision import find_setup_dir, get_domain_descriptor, get_config_descriptor, secretsdb_self_join,set_gpo_acl,getpolicypath,create_gpo_struct, ProvisioningError
from samba.schema import get_linked_attributes, Schema, get_schema_descriptor
from samba.dcerpc import security
from samba.ndr import ndr_unpack
from samba.dcerpc.misc import SEC_CHAN_BDC
from samba.upgradehelpers import dn_sort, get_paths, newprovision, find_provision_key_parameters

never=0
replace=2^FLAG_MOD_REPLACE
add=2^FLAG_MOD_ADD
delete=2^FLAG_MOD_DELETE

#Errors are always logged
ERROR =     -1
SIMPLE =     0x00
CHANGE =     0x01
CHANGESD =     0x02
GUESS =     0x04
PROVISION =    0x08
CHANGEALL =    0xff

__docformat__ = "restructuredText"

# Attributes that are never copied from the reference provision (even if they
# do not exist in the destination object).
# This is most probably because they are populated automatcally when object is
# created
# This also apply to imported object from reference provision
hashAttrNotCopied = {     "dn": 1, "whenCreated": 1, "whenChanged": 1, "objectGUID": 1, "replPropertyMetaData": 1, "uSNChanged": 1,
                        "uSNCreated": 1, "parentGUID": 1, "objectCategory": 1, "distinguishedName": 1,
                        "showInAdvancedViewOnly": 1, "instanceType": 1, "cn": 1, "msDS-Behavior-Version":1, "nextRid":1,
                        "nTMixedDomain": 1, "versionNumber":1, "lmPwdHistory":1, "pwdLastSet": 1, "ntPwdHistory":1, "unicodePwd":1,
                        "dBCSPwd":1, "supplementalCredentials":1, "gPCUserExtensionNames":1, "gPCMachineExtensionNames":1,
                        "maxPwdAge":1, "mail":1, "secret":1, "possibleInferiors":1, "sAMAccountType":1}

# Usually for an object that already exists we do not overwrite attributes as
# they might have been changed for good reasons. Anyway for a few of them it's
# mandatory to replace them otherwise the provision will be broken somehow.
hashOverwrittenAtt = {    "prefixMap": replace, "systemMayContain": replace, "systemOnly":replace, "searchFlags":replace,
                        "mayContain":replace,  "systemFlags":replace, "description":replace,
                        "oEMInformation":never, "operatingSystemVersion":replace, "adminPropertyPages":replace,
                        "defaultSecurityDescriptor": replace, "wellKnownObjects":replace, "privilege":delete, "groupType":replace,
                        "rIDAvailablePool": never}


backlinked = []
dn_syntax_att = []
def define_what_to_log(opts):
    what = 0
    if opts.debugchange:
        what = what | CHANGE
    if opts.debugchangesd:
        what = what | CHANGESD
    if opts.debugguess:
        what = what | GUESS
    if opts.debugprovision:
        what = what | PROVISION
    if opts.debugall:
        what = what | CHANGEALL
    return what


parser = optparse.OptionParser("provision [options]")
sambaopts = options.SambaOptions(parser)
parser.add_option_group(sambaopts)
parser.add_option_group(options.VersionOptions(parser))
credopts = options.CredentialsOptions(parser)
parser.add_option_group(credopts)
parser.add_option("--setupdir", type="string", metavar="DIR",
                    help="directory with setup files")
parser.add_option("--debugprovision", help="Debug provision", action="store_true")
parser.add_option("--debugguess", help="Print information on what is different but won't be changed", action="store_true")
parser.add_option("--debugchange", help="Print information on what is different but won't be changed", action="store_true")
parser.add_option("--debugchangesd", help="Print information security descriptors differences", action="store_true")
parser.add_option("--debugall", help="Print all available information (very verbose)", action="store_true")
parser.add_option("--full", help="Perform full upgrade of the samdb (schema, configuration, new objects, ...", action="store_true")

opts = parser.parse_args()[0]

whatToLog = define_what_to_log(opts)

def messageprovision(text):
    """Print a message if quiet is not set

    :param text: Message to print """
    if opts.debugprovision or opts.debugall:
        print text

def message(what,text):
    """Print a message if this message type has been selected to be printed

    :param what: Category of the message
    :param text: Message to print """
    if (whatToLog & what) or what <= 0:
        print text

if len(sys.argv) == 1:
    opts.interactive = True
lp = sambaopts.get_loadparm()
smbconf = lp.configfile

creds = credopts.get_credentials(lp)
creds.set_kerberos_state(DONT_USE_KERBEROS)
setup_dir = opts.setupdir
if setup_dir is None:
    setup_dir = find_setup_dir()

session = system_session()

def identic_rename(ldbobj,dn):
    """Perform a back and forth rename to trigger renaming on attribute that can't be directly modified.

    :param lbdobj: An Ldb Object
    :param dn: DN of the object to manipulate """
    (before,sep,after)=str(dn).partition('=')
    ldbobj.rename(dn,Dn(ldbobj,"%s=foo%s"%(before,after)))
    ldbobj.rename(Dn(ldbobj,"%s=foo%s"%(before,after)),dn)


def populate_backlink(newpaths,creds,session,schemadn):
    """Populate an array with all the back linked attributes

    This attributes that are modified automaticaly when
    front attibutes are changed

    :param newpaths: a list of paths for different provision objects
    :param creds: credential for the authentification
    :param session: session for connexion
    :param schemadn: DN of the schema for the partition"""
    newsam_ldb = Ldb(newpaths.samdb, session_info=session, credentials=creds,lp=lp)
    linkedAttHash = get_linked_attributes(Dn(newsam_ldb,str(schemadn)),newsam_ldb)
    backlinked.extend(linkedAttHash.values())

def populate_dnsyntax(newpaths,creds,session,schemadn):
    """Populate an array with all the attributes that have DN synthax (oid 2.5.5.1)

    :param newpaths: a list of paths for different provision objects
    :param creds: credential for the authentification
    :param session: session for connexion
    :param schemadn: DN of the schema for the partition"""
    newsam_ldb = Ldb(newpaths.samdb, session_info=session, credentials=creds,lp=lp)
    res = newsam_ldb.search(expression="(attributeSyntax=2.5.5.1)",base=Dn(newsam_ldb,str(schemadn)),
                            scope=SCOPE_SUBTREE, attrs=["lDAPDisplayName"])
    for elem in res:
        dn_syntax_att.append(elem["lDAPDisplayName"])


def sanitychecks(credentials,session_info,names,paths):
    """Populate an array with all the attributes that have DN synthax (oid 2.5.5.1)

    :param creds: credential for the authentification
    :param session_info: session for connexion
    :param names: list of key provision parameters
    :param paths: list of path to provision object
    :return: Status of check (1 for Ok, 0 for not Ok) """
    sam_ldb = Ldb(paths.samdb, session_info=session, credentials=creds,lp=lp,options=["modules:samba_dsdb"])

    sam_ldb.set_session_info(session)
    res = sam_ldb.search(expression="objectClass=ntdsdsa",base=str(names.configdn),
                         scope=SCOPE_SUBTREE,attrs=["dn"],controls=["search_options:1:2"])
    if len(res) == 0:
        print "No DC found, your provision is most probalby hardly broken !"
        return False
    elif len(res) != 1:
        print "Found %d domain controllers, for the moment upgradeprovision is not able to handle upgrade on \
domain with more than one DC, please demote the other(s) DC(s) before upgrading"%len(res)
        return False
    else:
        return True


def print_provision_key_parameters(names):
    """Do a a pretty print of provision parameters

    :param names: list of key provision parameters """
    message(GUESS, "rootdn      :"+str(names.rootdn))
    message(GUESS, "configdn    :"+str(names.configdn))
    message(GUESS, "schemadn    :"+str(names.schemadn))
    message(GUESS, "serverdn    :"+str(names.serverdn))
    message(GUESS, "netbiosname :"+names.netbiosname)
    message(GUESS, "defaultsite :"+names.sitename)
    message(GUESS, "dnsdomain   :"+names.dnsdomain)
    message(GUESS, "hostname    :"+names.hostname)
    message(GUESS, "domain      :"+names.domain)
    message(GUESS, "realm       :"+names.realm)
    message(GUESS, "invocationid:"+names.invocation)
    message(GUESS, "policyguid  :"+names.policyid)
    message(GUESS, "policyguiddc:"+str(names.policyid_dc))
    message(GUESS, "domainsid   :"+str(names.domainsid))
    message(GUESS, "domainguid  :"+names.domainguid)
    message(GUESS, "ntdsguid    :"+names.ntdsguid)
    message(GUESS, "domainlevel :"+str(names.domainlevel))


def handle_security_desc(ischema, att, msgElt, hashallSD, old, new):
    """Check if the security descriptor has been modified.

    This function also populate a hash used for the upgrade process.
    :param ischema: Boolean that indicate if it's the schema that is updated
    :param att: Name of the attribute
    :param msgElt: MessageElement object
    :param hashallSD: Hash table with DN as key and the old SD as value
    :param old: The updated LDAP object
    :param new: The reference LDAP object
    :return: 1 to indicate that the attribute should be kept, 0 for discarding it
    """
    if ischema == 1 and att == "defaultSecurityDescriptor"  and msgElt.flags() == FLAG_MOD_REPLACE:
        hashSD = {}
        hashSD["oldSD"] = old[0][att]
        hashSD["newSD"] = new[0][att]
        hashallSD[str(old[0].dn)] = hashSD
        return True
    if att == "nTSecurityDescriptor"  and msgElt.flags() == FLAG_MOD_REPLACE:
        if ischema == 0:
            hashSD = {}
            hashSD["oldSD"] = ndr_unpack(security.descriptor, str(old[0][att]))
            hashSD["newSD"] = ndr_unpack(security.descriptor, str(new[0][att]))
            hashallSD[str(old[0].dn)] = hashSD
        return False
    return False


def handle_special_case(att, delta, new, old, ischema):
    """Define more complicate update rules for some attributes

    :param att: The attribute to be updated
    :param delta: A messageElement object that correspond to the difference between the updated object and the reference one
    :param new: The reference object
    :param old: The Updated object
    :param ischema: A boolean that indicate that the attribute is part of a schema object
    :return: Tru to indicate that the attribute should be kept, False for discarding it
    """
    flag = delta.get(att).flags()
    if (att == "gPLink" or att == "gPCFileSysPath") and \
        flag == FLAG_MOD_REPLACE and str(new[0].dn).lower() == str(old[0].dn).lower():
        delta.remove(att)
        return True
    if att == "forceLogoff":
        ref=0x8000000000000000
        oldval=int(old[0][att][0])
        newval=int(new[0][att][0])
        ref == old and ref == abs(new)
        return True
    if (att == "adminDisplayName" or att == "adminDescription") and ischema:
        return True

    if (str(old[0].dn) == "CN=Samba4-Local-Domain,%s" % (str(names.schemadn))\
        and att == "defaultObjectCategory" and flag == FLAG_MOD_REPLACE):
        return True

    if (str(old[0].dn) == "CN=Title,%s"%(str(names.schemadn)) and att == "rangeUpper" and flag == FLAG_MOD_REPLACE):
        return True

    if ((att == "member" or att == "servicePrincipalName") and flag == FLAG_MOD_REPLACE):
        hash = {}
        newval = []
        changeDelta=0
        for elem in old[0][att]:
            hash[str(elem)]=1
            newval.append(str(elem))

        for elem in new[0][att]:
            if not hash.has_key(str(elem)):
                changeDelta=1
                newval.append(str(elem))
        if changeDelta == 1:
            delta[att] = MessageElement(newval, FLAG_MOD_REPLACE, att)
        else:
            delta.remove(att)
        return True

    if (str(old[0].dn) == "%s"%(str(names.rootdn)) and att == "subRefs" and flag == FLAG_MOD_REPLACE):
        return True
    if str(delta.dn).endswith("CN=DisplaySpecifiers,%s"%names.configdn):
        return True
    return False

def update_secrets(newpaths, paths, creds, session):
    """Update secrets.ldb

    :param newpaths: a list of paths for different provision objects from the
        reference provision
    :param paths: a list of paths for different provision objects from the
        upgraded provision
    :param creds: credential for the authentification
    :param session: session for connexion"""

    message(SIMPLE,"update secrets.ldb")
    newsecrets_ldb = Ldb(newpaths.secrets, session_info=session,
        credentials=creds,lp=lp)
    secrets_ldb = Ldb(paths.secrets, session_info=session,
        credentials=creds,lp=lp, options=["modules:samba_secrets"])
    reference = newsecrets_ldb.search(expression="dn=@MODULES",base="",
        scope=SCOPE_SUBTREE)
    current = secrets_ldb.search(expression="dn=@MODULES",base="",
        scope=SCOPE_SUBTREE)
    delta = secrets_ldb.msg_diff(current[0],reference[0])
    delta.dn = current[0].dn
    secrets_ldb.modify(delta)

    newsecrets_ldb = Ldb(newpaths.secrets, session_info=session, credentials=creds,lp=lp)
    secrets_ldb = Ldb(paths.secrets, session_info=session, credentials=creds,lp=lp)
    reference = newsecrets_ldb.search(expression="objectClass=top",base="", scope=SCOPE_SUBTREE,attrs=["dn"])
    current = secrets_ldb.search(expression="objectClass=top",base="", scope=SCOPE_SUBTREE,attrs=["dn"])
    hash_new = {}
    hash = {}
    listMissing = []
    listPresent = []

    empty = Message()
    for i in range(0,len(reference)):
        hash_new[str(reference[i]["dn"]).lower()] = reference[i]["dn"]

    # Create a hash for speeding the search of existing object in the
    # current provision
    for i in range(0,len(current)):
        hash[str(current[i]["dn"]).lower()] = current[i]["dn"]

    for k in hash_new.keys():
        if not hash.has_key(k):
            listMissing.append(hash_new[k])
        else:
            listPresent.append(hash_new[k])

    for entry in listMissing:
        reference = newsecrets_ldb.search(expression="dn=%s"%entry,base="", scope=SCOPE_SUBTREE)
        current = secrets_ldb.search(expression="dn=%s"%entry,base="", scope=SCOPE_SUBTREE)
        delta = secrets_ldb.msg_diff(empty,reference[0])
        for att in hashAttrNotCopied.keys():
            delta.remove(att)
        message(CHANGE,"Entry %s is missing from secrets.ldb"%reference[0].dn)
        for att in delta:
            message(CHANGE," Adding attribute %s"%att)
        delta.dn = reference[0].dn
        secrets_ldb.add(delta)

    for entry in listPresent:
        reference = newsecrets_ldb.search(expression="dn=%s"%entry,base="", scope=SCOPE_SUBTREE)
        current = secrets_ldb.search(expression="dn=%s"%entry,base="", scope=SCOPE_SUBTREE)
        delta = secrets_ldb.msg_diff(current[0],reference[0])
        for att in hashAttrNotCopied.keys():
            delta.remove(att)
        for att in delta:
            if att == "name":
                message(CHANGE,"Found attribute name on  %s, must rename the DN "%(current[0].dn))
                identic_rename(secrets_ldb,reference[0].dn)
            else:
                delta.remove(att)

    for entry in listPresent:
        reference = newsecrets_ldb.search(expression="dn=%s"%entry,base="", scope=SCOPE_SUBTREE)
        current = secrets_ldb.search(expression="dn=%s"%entry,base="", scope=SCOPE_SUBTREE)
        delta = secrets_ldb.msg_diff(current[0],reference[0])
        for att in hashAttrNotCopied.keys():
            delta.remove(att)
        for att in delta:
            if att != "dn":
                message(CHANGE," Adding/Changing attribute %s to %s"%(att,current[0].dn))

        delta.dn = current[0].dn
        secrets_ldb.modify(delta)


def dump_denied_change(dn,att,flagtxt,current,reference):
    """Print detailed information about why a changed is denied

    :param dn: DN of the object which attribute is denied
    :param att: Attribute that was supposed to be upgraded
    :param flagtxt: Type of the update that should be performed (add, change, remove, ...)
    :param current: Value(s) of the current attribute
    :param reference: Value(s) of the reference attribute"""

    message(CHANGE, "dn= "+str(dn)+" "+att+" with flag "+flagtxt+" is not allowed to be changed/removed, I discard this change ...")
    if att != "objectSid" :
        i = 0
        for e in range(0,len(current)):
            message(CHANGE,"old %d : %s"%(i,str(current[e])))
            i+=1
        if reference != None:
            i = 0
            for e in range(0,len(reference)):
                message(CHANGE,"new %d : %s"%(i,str(reference[e])))
                i+=1
    else:
        message(CHANGE,"old : %s"%str(ndr_unpack( security.dom_sid,current[0])))
        message(CHANGE,"new : %s"%str(ndr_unpack( security.dom_sid,reference[0])))


def handle_special_add(sam_ldb,dn,names):
    """Handle special operation (like remove) on some object needed during upgrade

    This is mostly due to wrong creation of the object in previous provision.
    :param sam_ldb: An Ldb object representing the SAM database
    :param dn: DN of the object to inspect
    :param names: list of key provision parameters"""
    dntoremove = None
    if str(dn).lower() == ("CN=Certificate Service DCOM Access,CN=Builtin,%s"%names.rootdn).lower():
        #This entry was misplaced lets remove it if it exists
        dntoremove = "CN=Certificate Service DCOM Access,CN=Users,%s"%names.rootdn

    if str(dn).lower() == ("CN=Cryptographic Operators,CN=Builtin,%s"%names.rootdn).lower():
        #This entry was misplaced lets remove it if it exists
        dntoremove = "CN=Cryptographic Operators,CN=Users,%s"%names.rootdn

    if str(dn).lower() == ("CN=Event Log Readers,CN=Builtin,%s"%names.rootdn).lower():
        #This entry was misplaced lets remove it if it exists
        dntoremove = "CN=Event Log Readers,CN=Users,%s"%names.rootdn

    if dntoremove != None:
        res = sam_ldb.search(expression="objectClass=*",base=dntoremove, scope=SCOPE_BASE,attrs=["dn"],controls=["search_options:1:2"])
        if len(res) > 0:
            message(CHANGE,"Existing object %s must be replaced by %s, removing old object"%(dntoremove,str(dn)))
            sam_ldb.delete(res[0]["dn"])


def check_dn_nottobecreated(hash, index, listdn):
    """Check if one of the DN present in the list has a creation order greater than the current.

    Hash is indexed by dn to be created, with each key is associated the creation order
    First dn to be created has the creation order 0, second has 1, ...
    Index contain the current creation order

    :param hash: Hash holding the different DN of the object to be created as key
    :param index: Current creation order
    :param listdn: List of DNs on which the current DN depends on
    :return: None if the current object do not depend on other object or if all object have been
    created before."""
    if listdn == None:
        return None
    for dn in listdn:
        key = str(dn).lower()
        if hash.has_key(key) and hash[key] > index:
            return str(dn)
    return None


def add_missing_object(newsam_ldb, sam_ldb, dn, names, basedn, hash, index):
    """Add a new object if the dependencies are satisfied

    The function add the object if the object on which it depends are already created
    :param newsam_ldb: Ldb object representing the SAM db of the reference provision
    :param sam_ldb: Ldb object representing the SAM db of the upgraded provision
    :param dn: DN of the object to be added
    :param names: List of key provision parameters
    :param basedn: DN of the partition to be updated
    :param hash: Hash holding the different DN of the object to be created as key
    :param index: Current creation order
    :return: True if the object was created False otherwise"""
    handle_special_add(sam_ldb,dn,names)
    reference = newsam_ldb.search(expression="dn=%s"%(str(dn)),base=basedn,
                    scope=SCOPE_SUBTREE,controls=["search_options:1:2"])
    empty = Message()
    delta = sam_ldb.msg_diff(empty,reference[0])
    for att in hashAttrNotCopied.keys():
        delta.remove(att)
    for att in backlinked:
        delta.remove(att)
    depend_on_yettobecreated = None
    for att in dn_syntax_att:
        depend_on_yet_tobecreated = check_dn_nottobecreated(hash,index,delta.get(str(att)))
        if depend_on_yet_tobecreated != None:
            message(CHANGE,"Object %s depends on %s in attribute %s, delaying the creation"
                            %(str(dn),depend_on_yet_tobecreated,str(att)))
            return False
    delta.dn = dn
    message(CHANGE,"Object %s will be added"%dn)
    sam_ldb.add(delta,["relax:0"])
    return True


def gen_dn_index_hash(listMissing):
    """Generate a hash associating the DN to its creation order

    :param listMissing: List of DN
    :return: Hash with DN as keys and creation order as values"""
    hash = {}
    for i in range(0,len(listMissing)):
        hash[str(listMissing[i]).lower()] = i
    return hash


def add_missing_entries(newsam_ldb, sam_ldb, names, basedn,list):
    """Add the missing object whose DN is the list

    The function add the object if the object on which it depends are already created
    :param newsam_ldb: Ldb object representing the SAM db of the reference provision
    :param sam_ldb: Ldb object representing the SAM db of the upgraded provision
    :param dn: DN of the object to be added
    :param names: List of key provision parameters
    :param basedn: DN of the partition to be updated
    :param list: List of DN to be added in the upgraded provision"""
    listMissing = []
    listDefered = list

    while(len(listDefered) != len(listMissing) and len(listDefered) > 0):
        index = 0
        listMissing = listDefered
        listDefered = []
        hashMissing = gen_dn_index_hash(listMissing)
        for dn in listMissing:
            ret = add_missing_object(newsam_ldb,sam_ldb,dn,names,basedn,hashMissing,index)
            index = index + 1
            if ret == 0:
                #DN can't be created because it depends on some other DN in the list
                listDefered.append(dn)
    if len(listDefered) != 0:
        raise ProvisioningError("Unable to insert missing elements: circular references")


def check_diff_name(newpaths, paths, creds, session, basedn, names, ischema):
    """Check differences between the reference provision and the upgraded one.

    It looks for all objects which base DN is name. If ischema is "false" then
    the scan is done in cross partition mode.
    If "ischema" is true, then special handling is done for dealing with schema

    This function will also add the missing object and update existing object to add
    or remove attributes that were missing.
    :param newpaths: List of paths for different provision objects from the reference provision
    :param paths: List of paths for different provision objects from the upgraded provision
    :param creds: Credential for the authentification
    :param session: Session for connexion
    :param basedn: DN of the partition to update
    :param names: List of key provision parameters
    :param ischema: Boolean indicating if the update is about the schema only
    :return: Hash of security descriptor to update"""

    hash_new = {}
    hash = {}
    hashallSD = {}
    listMissing = []
    listPresent = []
    reference = []
    current = []
    # Connect to the reference provision and get all the attribute in the
    # partition referred by name
    newsam_ldb = Ldb(newpaths.samdb, session_info=session, credentials=creds,lp=lp)
    sam_ldb = Ldb(paths.samdb, session_info=session, credentials=creds,lp=lp, options=["modules:samba_dsdb"])
    sam_ldb.transaction_start()
    if ischema:
        reference = newsam_ldb.search(expression="objectClass=*",base=basedn, scope=SCOPE_SUBTREE,attrs=["dn"])
        current = sam_ldb.search(expression="objectClass=*",base=basedn, scope=SCOPE_SUBTREE,attrs=["dn"])
    else:
        reference = newsam_ldb.search(expression="objectClass=*",base=basedn, scope=SCOPE_SUBTREE,attrs=["dn"],controls=["search_options:1:2"])
        current = sam_ldb.search(expression="objectClass=*",base=basedn, scope=SCOPE_SUBTREE,attrs=["dn"],controls=["search_options:1:2"])

    sam_ldb.transaction_commit()
    # Create a hash for speeding the search of new object
    for i in range(0,len(reference)):
        hash_new[str(reference[i]["dn"]).lower()] = reference[i]["dn"]

    # Create a hash for speeding the search of existing object in the
    # current provision
    for i in range(0,len(current)):
        hash[str(current[i]["dn"]).lower()] = current[i]["dn"]

    for k in hash_new.keys():
        if not hash.has_key(k):
            print hash_new[k]
            listMissing.append(hash_new[k])
        else:
            listPresent.append(hash_new[k])

    # Sort the missing object in order to have object of the lowest level
    # first (which can be containers for higher level objects)
    listMissing.sort(dn_sort)
    listPresent.sort(dn_sort)

    if ischema:
        # The following lines (up to the for loop) is to load the up to
        # date schema into our current LDB
        # a complete schema is needed as the insertion of attributes
        # and class is done against it
        # and the schema is self validated
        # The double ldb open and schema validation is taken from the
        # initial provision script
        # it's not certain that it is really needed ....
        sam_ldb = Ldb(session_info=session, credentials=creds, lp=lp)
        schema = Schema(setup_path, names.domainsid, schemadn=basedn, serverdn=str(names.serverdn))
        # Load the schema from the one we computed earlier
        sam_ldb.set_schema_from_ldb(schema.ldb)
        # And now we can connect to the DB - the schema won't be loaded
        # from the DB
        sam_ldb.connect(paths.samdb)
    else:
        sam_ldb = Ldb(paths.samdb, session_info=session, credentials=creds,lp=lp, options=["modules:samba_dsdb"])

    sam_ldb.transaction_start()
    # XXX: This needs to be wrapped in try/except so we
    # abort on exceptions.
    message(SIMPLE,"There are %d missing objects"%(len(listMissing)))
    add_missing_entries(newsam_ldb,sam_ldb,names,basedn,listMissing)
    changed = 0
    for dn in listPresent:
        reference = newsam_ldb.search(expression="dn=%s"%(str(dn)),base=basedn, scope=SCOPE_SUBTREE,controls=["search_options:1:2"])
        current = sam_ldb.search(expression="dn=%s"%(str(dn)),base=basedn, scope=SCOPE_SUBTREE,controls=["search_options:1:2"])
        if ((str(current[0].dn) != str(reference[0].dn)) and (str(current[0].dn).upper() == str(reference[0].dn).upper())):
            message(CHANGE,"Name are the same but case change, let's rename %s to %s"%(str(current[0].dn),str(reference[0].dn)))
            identic_rename(sam_ldb,reference[0].dn)
            current = sam_ldb.search(expression="dn=%s"%(str(dn)),base=basedn, scope=SCOPE_SUBTREE,controls=["search_options:1:2"])

        delta = sam_ldb.msg_diff(current[0],reference[0])
        for att in hashAttrNotCopied.keys():
            delta.remove(att)
        for att in backlinked:
            delta.remove(att)
        delta.remove("parentGUID")
        nb = 0
        
        for att in delta:
            msgElt = delta.get(att)
            if att == "dn":
                continue
            if att == "name":
                delta.remove(att)
                continue
            if not handle_security_desc(ischema,att,msgElt,hashallSD,current,reference):
                delta.remove(att)
                continue
            if (not hashOverwrittenAtt.has_key(att) or not (hashOverwrittenAtt.get(att)&2^msgElt.flags())):
                if  hashOverwrittenAtt.has_key(att) and hashOverwrittenAtt.get(att)==never:
                    delta.remove(att)
                    continue
                if not handle_special_case(att,delta,reference,current,ischema) and msgElt.flags()!=FLAG_MOD_ADD:
                    if opts.debugchange or opts.debugall:
                        try:
                            dump_denied_change(dn,att,messageEltFlagToString(msgElt.flags()),current[0][att],reference[0][att])
                        except:
                            # FIXME: Should catch an explicit exception here
                            dump_denied_change(dn,att,messageEltFlagToString(msgElt.flags()),current[0][att],None)
                    delta.remove(att)
        delta.dn = dn
        if len(delta.items()) >1:
            attributes=",".join(delta.keys())
            message(CHANGE,"%s is different from the reference one, changed attributes: %s"%(dn,attributes))
            changed = changed + 1
            sam_ldb.modify(delta)

    sam_ldb.transaction_commit()
    message(SIMPLE,"There are %d changed objects"%(changed))
    return hashallSD


def check_updated_sd(newpaths, paths, creds, session, names):
    """Check if the security descriptor in the upgraded provision are the same as the reference

    :param newpaths: List of paths for different provision objects from the reference provision
    :param paths: List of paths for different provision objects from the upgraded provision
    :param creds: Credential for the authentification
    :param session: Session for connexion
    :param basedn: DN of the partition to update
    :param names: List of key provision parameters"""
    newsam_ldb = Ldb(newpaths.samdb, session_info=session, credentials=creds,lp=lp)
    sam_ldb = Ldb(paths.samdb, session_info=session, credentials=creds,lp=lp)
    reference = newsam_ldb.search(expression="objectClass=*",base=str(names.rootdn), scope=SCOPE_SUBTREE,attrs=["dn","nTSecurityDescriptor"],controls=["search_options:1:2"])
    current = sam_ldb.search(expression="objectClass=*",base=str(names.rootdn), scope=SCOPE_SUBTREE,attrs=["dn","nTSecurityDescriptor"],controls=["search_options:1:2"])
    hash_new = {}
    for i in range(0,len(reference)):
        hash_new[str(reference[i]["dn"]).lower()] = ndr_unpack(security.descriptor,str(reference[i]["nTSecurityDescriptor"])).as_sddl(names.domainsid)

    for i in range(0,len(current)):
        key = str(current[i]["dn"]).lower()
        if hash_new.has_key(key):
            sddl = ndr_unpack(security.descriptor,str(current[i]["nTSecurityDescriptor"])).as_sddl(names.domainsid)
            if sddl != hash_new[key]:
                print "%s new sddl/sddl in ref"%key
                print "%s\n%s"%(sddl,hash_new[key])


def update_sd(paths, creds, session, names):
    """Update security descriptor of the current provision

    During the different pre release of samba4 security descriptors (SD) were notarly broken (up to alpha11 included)
    This function allow to get them back in order, this function make the assumption that nobody has modified manualy an SD
    and so SD can be safely recalculated from scratch to get them right.

    :param paths: List of paths for different provision objects from the upgraded provision
    :param creds: Credential for the authentification
    :param session: Session for connexion
    :param names: List of key provision parameters"""

    sam_ldb = Ldb(paths.samdb, session_info=session, credentials=creds,lp=lp,options=["modules:samba_dsdb"])
    sam_ldb.transaction_start()
    # First update the SD for the rootdn
    sam_ldb.set_session_info(session)
    res = sam_ldb.search(expression="objectClass=*", base=str(names.rootdn), scope=SCOPE_BASE,\
                         attrs=["dn", "whenCreated"], controls=["search_options:1:2"])
    delta = Message()
    delta.dn = Dn(sam_ldb,str(res[0]["dn"]))
    descr = get_domain_descriptor(names.domainsid)
    delta["nTSecurityDescriptor"] = MessageElement(descr, FLAG_MOD_REPLACE, "nTSecurityDescriptor")
    sam_ldb.modify(delta,["recalculate_sd:0"])
    # Then the config dn
    res = sam_ldb.search(expression="objectClass=*",base=str(names.configdn), scope=SCOPE_BASE,attrs=["dn","whenCreated"],controls=["search_options:1:2"])
    delta = Message()
    delta.dn = Dn(sam_ldb,str(res[0]["dn"]))
    descr = get_config_descriptor(names.domainsid)
    delta["nTSecurityDescriptor"] = MessageElement(descr, FLAG_MOD_REPLACE, "nTSecurityDescriptor" )
    sam_ldb.modify(delta,["recalculate_sd:0"])
    # Then the schema dn
    res = sam_ldb.search(expression="objectClass=*",base=str(names.schemadn), scope=SCOPE_BASE,attrs=["dn","whenCreated"],controls=["search_options:1:2"])
    delta = Message()
    delta.dn = Dn(sam_ldb,str(res[0]["dn"]))
    descr = get_schema_descriptor(names.domainsid)
    delta["nTSecurityDescriptor"] = MessageElement(descr, FLAG_MOD_REPLACE, "nTSecurityDescriptor" )
    sam_ldb.modify(delta,["recalculate_sd:0"])

    # Then the rest
    hash = {}
    res = sam_ldb.search(expression="objectClass=*",base=str(names.rootdn), scope=SCOPE_SUBTREE,attrs=["dn","whenCreated"],controls=["search_options:1:2"])
    for obj in res:
        if not (str(obj["dn"]) == str(names.rootdn) or
            str(obj["dn"]) == str(names.configdn) or \
            str(obj["dn"]) == str(names.schemadn)):
            hash[str(obj["dn"])] = obj["whenCreated"]

    listkeys = hash.keys()
    listkeys.sort(dn_sort)

    for key in listkeys:
        try:
            delta = Message()
            delta.dn = Dn(sam_ldb,key)
            delta["whenCreated"] = MessageElement(hash[key], FLAG_MOD_REPLACE, "whenCreated" )
            sam_ldb.modify(delta,["recalculate_sd:0"])
        except:
            # XXX: We should always catch an explicit exception.
            # What could go wrong here?
            sam_ldb.transaction_cancel()
            res = sam_ldb.search(expression="objectClass=*", base=str(names.rootdn), scope=SCOPE_SUBTREE,\
                                 attrs=["dn","nTSecurityDescriptor"], controls=["search_options:1:2"])
            print "bad stuff" +ndr_unpack(security.descriptor,str(res[0]["nTSecurityDescriptor"])).as_sddl(names.domainsid)
            return
    sam_ldb.transaction_commit()


def update_basesamdb(newpaths, paths, names):
    """Update the provision container db: sam.ldb

    :param newpaths: List of paths for different provision objects from the reference provision
    :param paths: List of paths for different provision objects from the upgraded provision
    :param names: List of key provision parameters"""

    message(SIMPLE,"Copy samdb")
    shutil.copy(newpaths.samdb,paths.samdb)

    message(SIMPLE,"Update partitions filename if needed")
    schemaldb = os.path.join(paths.private_dir, "schema.ldb")
    configldb = os.path.join(paths.private_dir, "configuration.ldb")
    usersldb = os.path.join(paths.private_dir, "users.ldb")
    samldbdir = os.path.join(paths.private_dir, "sam.ldb.d")

    if not os.path.isdir(samldbdir):
        os.mkdir(samldbdir)
        os.chmod(samldbdir,0700)
    if os.path.isfile(schemaldb):
        shutil.copy(schemaldb, os.path.join(samldbdir, "%s.ldb" % str(names.schemadn).upper()))
        os.remove(schemaldb)
    if os.path.isfile(usersldb):
        shutil.copy(usersldb, os.path.join(samldbdir, "%s.ldb" % str(names.rootdn).upper()))
        os.remove(usersldb)
    if os.path.isfile(configldb):
        shutil.copy(configldb, os.path.join(samldbdir, "%s.ldb" % str(names.configdn).upper()))
        os.remove(configldb)


def update_privilege(newpaths, paths):
    """Update the privilege database

    :param newpaths: List of paths for different provision objects from the reference provision
    :param paths: List of paths for different provision objects from the upgraded provision"""
    message(SIMPLE, "Copy privilege")
    shutil.copy(os.path.join(newpaths.private_dir, "privilege.ldb"), 
                os.path.join(paths.private_dir, "privilege.ldb"))


def update_samdb(newpaths, paths, creds, session, names):
    """Upgrade the SAM DB contents for all the provision

    :param newpaths: List of paths for different provision objects from the reference provision
    :param paths: List of paths for different provision objects from the upgraded provision
    :param creds: Credential for the authentification
    :param session: Session for connexion
    :param names: List of key provision parameters"""

    message(SIMPLE, "Doing schema update")
    hashdef = check_diff_name(newpaths,paths,creds,session,str(names.schemadn),names,1)
    message(SIMPLE,"Done with schema update")
    message(SIMPLE,"Scanning whole provision for updates and additions")
    hashSD = check_diff_name(newpaths,paths,creds,session,str(names.rootdn),names,0)
    message(SIMPLE,"Done with scanning")


def update_machine_account_password(paths, creds, session, names):
    """Update (change) the password of the current DC both in the SAM db and in secret one

    :param paths: List of paths for different provision objects from the upgraded provision
    :param creds: Credential for the authentification
    :param session: Session for connexion
    :param names: List of key provision parameters"""

    secrets_ldb = Ldb(paths.secrets, session_info=session,
        credentials=creds,lp=lp)
    secrets_ldb.transaction_start()
    secrets_msg = secrets_ldb.search(expression=("samAccountName=%s$" % names.netbiosname), attrs=["secureChannelType"])
    sam_ldb = Ldb(paths.samdb, session_info=session, credentials=creds,lp=lp)
    sam_ldb.transaction_start()
    if int(secrets_msg[0]["secureChannelType"][0]) == SEC_CHAN_BDC:
        res = sam_ldb.search(expression=("samAccountName=%s$" % names.netbiosname), attrs=[])
        assert(len(res) == 1)

        msg = Message(res[0].dn)
        machinepass = samba.generate_random_password(128, 255)
        msg["userPassword"] = MessageElement(machinepass, FLAG_MOD_REPLACE, "userPassword")
        sam_ldb.modify(msg)

        res = sam_ldb.search(expression=("samAccountName=%s$" % names.netbiosname),
                     attrs=["msDs-keyVersionNumber"])
        assert(len(res) == 1)
        kvno = int(str(res[0]["msDs-keyVersionNumber"]))

        secretsdb_self_join(secrets_ldb, domain=names.domain,
                    realm=names.realm or sambaopts._lp.get('realm'),
                    domainsid=names.domainsid,
                    dnsdomain=names.dnsdomain,
                    netbiosname=names.netbiosname,
                    machinepass=machinepass,
                    key_version_number=kvno,
                    secure_channel_type=int(secrets_msg[0]["secureChannelType"][0]))
        sam_ldb.transaction_prepare_commit()
        secrets_ldb.transaction_prepare_commit()
        sam_ldb.transaction_commit()
        secrets_ldb.transaction_commit()
    else:
        secrets_ldb.transaction_cancel()


def update_gpo(paths,creds,session,names):
    """Create missing GPO file object if needed

    Set ACL correctly also.
    """
    dir = getpolicypath(paths.sysvol,names.dnsdomain,names.policyid)
    if not os.path.isdir(dir):
        create_gpo_struct(dir)

    dir = getpolicypath(paths.sysvol,names.dnsdomain,names.policyid_dc)
    if not os.path.isdir(dir):
        create_gpo_struct(dir)
    samdb = Ldb(paths.samdb, session_info=session, credentials=creds,lp=lp)
    set_gpo_acl(paths.sysvol, names.dnsdomain, names.domainsid,
        names.domaindn, samdb, lp)


def updateOEMInfo(paths, creds, session,names):
    sam_ldb = Ldb(paths.samdb, session_info=session, credentials=creds, lp=lp,
        options=["modules:samba_dsdb"])
    res = sam_ldb.search(expression="(objectClass=*)",base=str(names.rootdn),
                            scope=SCOPE_BASE, attrs=["dn","oEMInformation"])
    if len(res) > 0:
        info = res[0]["oEMInformation"]
        info = "%s, upgrade to %s"%(info,version)
        delta = Message()
        delta.dn = Dn(sam_ldb,str(res[0]["dn"]))
        descr = get_schema_descriptor(names.domainsid)
        delta["oEMInformation"] = MessageElement(info, FLAG_MOD_REPLACE,
            "oEMInformation" )
        sam_ldb.modify(delta)


def setup_path(file):
    return os.path.join(setup_dir, file)


if __name__ == '__main__':
    # From here start the big steps of the program
    # First get files paths
    paths=get_paths(param,smbconf=smbconf)
    paths.setup = setup_dir
    # Guess all the needed names (variables in fact) from the current
    # provision.

    names = find_provision_key_parameters(param, creds, session, paths, smbconf)
    if not sanitychecks(creds,session,names,paths):
        message(SIMPLE,"Sanity checks for the upgrade fails, checks messages and correct it before rerunning upgradeprovision")
        sys.exit(1)
    # Let's see them
    print_provision_key_parameters(names)
    # With all this information let's create a fresh new provision used as reference
    message(SIMPLE,"Creating a reference provision")
    provisiondir = tempfile.mkdtemp(dir=paths.private_dir, prefix="referenceprovision")
    newprovision(names, setup_dir, creds, session, smbconf, provisiondir, messageprovision)
    # Get file paths of this new provision
    newpaths = get_paths(param, targetdir=provisiondir)
    populate_backlink(newpaths, creds, session,names.schemadn)
    populate_dnsyntax(newpaths, creds, session,names.schemadn)
    # Check the difference
    update_basesamdb(newpaths, paths, names)

    if opts.full:
        update_samdb(newpaths, paths, creds, session, names)
    update_secrets(newpaths, paths, creds, session)
    update_privilege(newpaths, paths)
    update_machine_account_password(paths, creds, session, names)
    # SD should be created with admin but as some previous acl were so wrong that admin can't modify them we have first
    # to recreate them with the good form but with system account and then give the ownership to admin ...
    admin_session_info = admin_session(lp, str(names.domainsid))
    message(SIMPLE, "Updating SD")
    update_sd(paths, creds, session,names)
    update_sd(paths, creds, admin_session_info, names)
    check_updated_sd(newpaths, paths, creds, session, names)
    updateOEMInfo(paths,creds,session,names)
    message(SIMPLE, "Upgrade finished !")
    # remove reference provision now that everything is done !
    shutil.rmtree(provisiondir)