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# Authors:
#     Alexander Bokovoy <abokovoy@redhat.com>
#
# Copyright (C) 2011  Red Hat
# see file 'COPYING' for use and warranty information
#
# Portions (C) Andrew Tridgell, Andrew Bartlett
#
# 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/>.

# Make sure we only run this module at the server where samba4-python
# package is installed to avoid issues with unavailable modules

from ipalib.plugins.baseldap import *
from ipalib import api, Str, Password, DefaultFrom, _, ngettext, Object
from ipalib.parameters import Enum
from ipalib import Command
from ipalib import errors
from ipapython import ipautil
from ipapython.ipa_log_manager import *
from ipapython.dn import DN
from ipaserver.install import installutils
from ipaserver.plugins import ldap2
from ipalib.util import normalize_name

import os, string, struct, copy
import uuid
from samba import param
from samba import credentials
from samba.dcerpc import security, lsa, drsblobs, nbt, netlogon
from samba.ndr import ndr_pack, ndr_print
from samba import net
import samba
import random
from M2Crypto import RC4
try:
    from ldap.controls import RequestControl as LDAPControl #pylint: disable=F0401
except ImportError:
    from ldap.controls import LDAPControl as LDAPControl    #pylint: disable=F0401
import ldap as _ldap
from ipapython.ipaldap import IPAdmin
from ipalib.session import krbccache_dir, krbccache_prefix
from dns import resolver, rdatatype
from dns.exception import DNSException
import pysss_nss_idmap
import pysss

__doc__ = _("""
Classes to manage trust joins using DCE-RPC calls

The code in this module relies heavily on samba4-python package
and Samba4 python bindings.
""")


def is_sid_valid(sid):
    try:
        security.dom_sid(sid)
    except TypeError:
        return False
    else:
        return True


access_denied_error =  errors.ACIError(info=_('CIFS server denied your credentials'))
dcerpc_error_codes = {
    -1073741823:
        errors.RemoteRetrieveError(reason=_('communication with CIFS server was unsuccessful')),
    -1073741790: access_denied_error,
    -1073741715: access_denied_error,
    -1073741614: access_denied_error,
    -1073741603:
        errors.ValidationError(name=_('AD domain controller'), error=_('unsupported functional level')),
    -1073741811: # NT_STATUS_INVALID_PARAMETER
        errors.RemoteRetrieveError(
            reason=_('AD domain controller complains about communication sequence. It may mean unsynchronized time on both sides, for example')),
}

dcerpc_error_messages = {
    "NT_STATUS_OBJECT_NAME_NOT_FOUND":
         errors.NotFound(reason=_('Cannot find specified domain or server name')),
    "NT_STATUS_INVALID_PARAMETER_MIX":
         errors.RequirementError(name=_('At least the domain or IP address should be specified')),
}

def assess_dcerpc_exception(num=None,message=None):
    """
    Takes error returned by Samba bindings and converts it into
    an IPA error class.
    """
    if num and num in dcerpc_error_codes:
        return dcerpc_error_codes[num]
    if message and message in dcerpc_error_messages:
        return dcerpc_error_messages[message]
    reason = _('''CIFS server communication error: code "%(num)s",
                  message "%(message)s" (both may be "None")''') % dict(num=num, message=message)
    return errors.RemoteRetrieveError(reason=reason)

class ExtendedDNControl(LDAPControl):
    # This class attempts to implement LDAP control that would work
    # with both python-ldap 2.4.x and 2.3.x, thus there is mix of properties
    # from both worlds and encodeControlValue has default parameter
    def __init__(self):
        self.controlValue = 1
        self.controlType = "1.2.840.113556.1.4.529"
        self.criticality = False
        self.integerValue = 1

    def encodeControlValue(self, value=None):
        return '0\x03\x02\x01\x01'


class DomainValidator(object):
    ATTR_FLATNAME = 'ipantflatname'
    ATTR_SID = 'ipantsecurityidentifier'
    ATTR_TRUSTED_SID = 'ipanttrusteddomainsid'
    ATTR_TRUST_PARTNER = 'ipanttrustpartner'
    ATTR_TRUST_AUTHOUT = 'ipanttrustauthoutgoing'

    def __init__(self, api):
        self.api = api
        self.ldap = self.api.Backend.ldap2
        self.domain = None
        self.flatname = None
        self.dn = None
        self.sid = None
        self._domains = None
        self._info = dict()
        self._creds = None
        self._parm = None

    def is_configured(self):
        cn_trust_local = DN(('cn', self.api.env.domain), self.api.env.container_cifsdomains, self.api.env.basedn)
        try:
            (dn, entry_attrs) = self.ldap.get_entry(cn_trust_local, [self.ATTR_FLATNAME, self.ATTR_SID])
            self.flatname = entry_attrs[self.ATTR_FLATNAME][0]
            self.sid = entry_attrs[self.ATTR_SID][0]
            self.dn = dn
            self.domain = self.api.env.domain
        except errors.NotFound, e:
            return False
        return True

    def get_trusted_domains(self):
        """
        Returns case-insensitive dict of trusted domain tuples
        (flatname, sid, trust_auth_outgoing), keyed by domain name.
        """
        cn_trust = DN(('cn', 'ad'), self.api.env.container_trusts,
                      self.api.env.basedn)

        try:
            search_kw = {'objectClass': 'ipaNTTrustedDomain'}
            filter = self.ldap.make_filter(search_kw, rules=self.ldap.MATCH_ALL)
            (entries, truncated) = self.ldap.find_entries(
                filter=filter,
                base_dn=cn_trust,
                attrs_list=[self.ATTR_TRUSTED_SID,
                            self.ATTR_FLATNAME,
                            self.ATTR_TRUST_PARTNER]
                )

            # We need to use case-insensitive dictionary since we use
            # domain names as keys and those are generally case-insensitive
            result = ipautil.CIDict()

            for dn, entry in entries:
                try:
                    trust_partner = entry[self.ATTR_TRUST_PARTNER][0]
                    flatname_normalized = entry[self.ATTR_FLATNAME][0].lower()
                    trusted_sid = entry[self.ATTR_TRUSTED_SID][0]
                except KeyError, e:
                    # Some piece of trusted domain info in LDAP is missing
                    # Skip the domain, but leave log entry for investigation
                    api.log.warn("Trusted domain '%s' entry misses an "
                                 "attribute: %s", dn, e)
                    continue

                result[trust_partner] = (flatname_normalized,
                                         security.dom_sid(trusted_sid))
            return result
        except errors.NotFound, e:
            return []

    def set_trusted_domains(self):
        # At this point we have SID_NT_AUTHORITY family SID and really need to
        # check it against prefixes of domain SIDs we trust to
        if not self._domains:
            self._domains = self.get_trusted_domains()
        if len(self._domains) == 0:
            # Our domain is configured but no trusted domains are configured
            # This means we can't check the correctness of a trusted
            # domain SIDs
            raise errors.ValidationError(name='sid',
                  error=_('no trusted domain is configured'))

    def get_domain_by_sid(self, sid, exact_match=False):
        if not self.domain:
            # our domain is not configured or self.is_configured() never run
            # reject SIDs as we can't check correctness of them
            raise errors.ValidationError(name='sid',
                  error=_('domain is not configured'))

        # Parse sid string to see if it is really in a SID format
        try:
            test_sid = security.dom_sid(sid)
        except TypeError:
            raise errors.ValidationError(name='sid',
                  error=_('SID is not valid'))

        # At this point we have SID_NT_AUTHORITY family SID and really need to
        # check it against prefixes of domain SIDs we trust to
        self.set_trusted_domains()

        # We have non-zero list of trusted domains and have to go through
        # them one by one and check their sids as prefixes / exact match
        # depending on the value of exact_match flag
        if exact_match:
            # check exact match of sids
            for domain in self._domains:
                if sid == str(self._domains[domain][1]):
                    return domain

            raise errors.NotFound(reason=_("SID does not match exactly"
                                           "with any trusted domain's SID"))
        else:
            # check as prefixes
            test_sid_subauths = test_sid.sub_auths
            for domain in self._domains:
                domsid = self._domains[domain][1]
                sub_auths = domsid.sub_auths
                num_auths = min(test_sid.num_auths, domsid.num_auths)
                if test_sid_subauths[:num_auths] == sub_auths[:num_auths]:
                    return domain
            raise errors.NotFound(reason=_('SID does not match any '
                                           'trusted domain'))

    def is_trusted_sid_valid(self, sid):
        try:
            self.get_domain_by_sid(sid)
        except (errors.ValidationError, errors.NotFound):
            return False
        else:
            return True

    def is_trusted_domain_sid_valid(self, sid):
        try:
            self.get_domain_by_sid(sid, exact_match=True)
        except (errors.ValidationError, errors.NotFound):
            return False
        else:
            return True

    def get_sid_from_domain_name(self, name):
        """Returns binary representation of SID for the trusted domain name
           or None if name is not in the list of trusted domains."""

        domains = self.get_trusted_domains()
        if name in domains:
            return domains[name][1]
        else:
            return None

    def get_trusted_domain_objects(self, domain=None, flatname=None, filter="",
            attrs=None, scope=_ldap.SCOPE_SUBTREE, basedn=None):
        """
        Search for LDAP objects in a trusted domain specified either by `domain'
        or `flatname'. The actual LDAP search is specified by `filter', `attrs',
        `scope' and `basedn'. When `basedn' is empty, database root DN is used.
        """
        assert domain is not None or flatname is not None
        """Returns SID for the trusted domain object (user or group only)"""
        if not self.domain:
            # our domain is not configured or self.is_configured() never run
            raise errors.ValidationError(name=_('Trust setup'),
                error=_('Our domain is not configured'))
        if not self._domains:
            self._domains = self.get_trusted_domains()
        if len(self._domains) == 0:
            # Our domain is configured but no trusted domains are configured
            raise errors.ValidationError(name=_('Trust setup'),
                error=_('No trusted domain is not configured'))

        entries = None
        if domain is not None:
            if domain not in self._domains:
                raise errors.ValidationError(name=_('trusted domain object'),
                   error= _('domain is not trusted'))
            # Now we have a name to check against our list of trusted domains
            entries = self.search_in_dc(domain, filter, attrs, scope, basedn)
        elif flatname is not None:
            # Flatname was specified, traverse through the list of trusted
            # domains first to find the proper one
            found_flatname = False
            for domain in self._domains:
                if self._domains[domain][0] == flatname:
                    found_flatname = True
                    entries = self.search_in_dc(domain, filter, attrs, scope, basedn)
                    if entries:
                        break
            if not found_flatname:
                raise errors.ValidationError(name=_('trusted domain object'),
                        error= _('no trusted domain matched the specified flat name'))
        if not entries:
            raise errors.NotFound(reason=_('trusted domain object not found'))

        return entries

    def get_trusted_domain_object_sid(self, object_name):
        result = pysss_nss_idmap.getsidbyname(object_name)
        if object_name in result and (pysss_nss_idmap.SID_KEY in result[object_name]):
            object_sid = result[object_name][pysss_nss_idmap.SID_KEY]
            return object_sid

        # Else, we are going to contact AD DC LDAP
        components = normalize_name(object_name)
        if not ('domain' in components or 'flatname' in components):
            # No domain or realm specified, ambiguous search
             raise errors.ValidationError(name=_('trusted domain object'),
                   error= _('Ambiguous search, user domain was not specified'))

        attrs = ['objectSid']
        filter = '(&(sAMAccountName=%(name)s)(|(objectClass=user)(objectClass=group)))' \
                % dict(name=components['name'])
        scope = _ldap.SCOPE_SUBTREE
        entries = self.get_trusted_domain_objects(components.get('domain'),
                components.get('flatname'), filter, attrs, scope)

        if len(entries) > 1:
            # Treat non-unique entries as invalid
            raise errors.ValidationError(name=_('trusted domain object'),
               error= _('Trusted domain did not return a unique object'))
        sid = self.__sid_to_str(entries[0][1]['objectSid'][0])
        try:
            test_sid = security.dom_sid(sid)
            return unicode(test_sid)
        except TypeError, e:
            raise errors.ValidationError(name=_('trusted domain object'),
               error= _('Trusted domain did not return a valid SID for the object'))

    def __get_trusted_domain_user_and_groups(self, object_name):
        """
        Returns a tuple with user SID and a list of SIDs of all groups he is
        a member of.

        LIMITATIONS:
            - only Trusted Admins group members can use this function as it
              uses secret for IPA-Trusted domain link
            - List of group SIDs does not contain group memberships outside
              of the trusted domain
        """
        components = normalize_name(object_name)
        domain = components.get('domain')
        flatname = components.get('flatname')
        name = components.get('name')

        is_valid_sid = is_sid_valid(object_name)
        if is_valid_sid:
            # Find a trusted domain for the SID
            domain = self.get_domain_by_sid(object_name)
            # Now search a trusted domain for a user with this SID
            attrs = ['cn']
            filter = '(&(objectClass=user)(objectSid=%(sid)s))' \
                    % dict(sid=object_name)
            try:
                entries = self.get_trusted_domain_objects(domain=domain, filter=filter,
                        attrs=attrs, scope=_ldap.SCOPE_SUBTREE)
            except errors.NotFound:
                raise errors.NotFound(reason=_('trusted domain user not found'))
            user_dn = entries[0][0]
        elif domain or flatname:
            attrs = ['cn']
            filter = '(&(sAMAccountName=%(name)s)(objectClass=user))' \
                    % dict(name=name)
            try:
                entries = self.get_trusted_domain_objects(domain,
                        flatname, filter, attrs, _ldap.SCOPE_SUBTREE)
            except errors.NotFound:
                raise errors.NotFound(reason=_('trusted domain user not found'))
            user_dn = entries[0][0]
        else:
            # No domain or realm specified, ambiguous search
            raise errors.ValidationError(name=_('trusted domain object'),
                   error= _('Ambiguous search, user domain was not specified'))

        # Get SIDs of user object and it's groups
        # tokenGroups attribute must be read with a scope BASE for a known user
        # distinguished name to avoid search error
        attrs = ['objectSID', 'tokenGroups']
        filter = "(objectClass=user)"
        entries = self.get_trusted_domain_objects(domain,
            flatname, filter, attrs, _ldap.SCOPE_BASE, user_dn)
        object_sid = self.__sid_to_str(entries[0][1]['objectSid'][0])
        group_sids = [self.__sid_to_str(sid) for sid in entries[0][1]['tokenGroups']]
        return (object_sid, group_sids)

    def get_trusted_domain_user_and_groups(self, object_name):
        """
        Returns a tuple with user SID and a list of SIDs of all groups he is
        a member of.

        First attempts to perform SID lookup via SSSD and in case of failure
        resorts back to checking trusted domain's AD DC LDAP directly.

        LIMITATIONS:
            - only Trusted Admins group members can use this function as it
              uses secret for IPA-Trusted domain link if SSSD lookup failed
            - List of group SIDs does not contain group memberships outside
              of the trusted domain
        """
        group_sids = None
        group_list = None
        object_sid = None
        is_valid_sid = is_sid_valid(object_name)
        if is_valid_sid:
            object_sid = object_name
            result = pysss_nss_idmap.getnamebysid(object_name)
            if object_name in result and (pysss_nss_idmap.NAME_KEY in result[object_name]):
                group_list = pysss.getgrouplist(result[object_name][pysss_nss_idmap.NAME_KEY])
        else:
            result = pysss_nss_idmap.getsidbyname(object_name)
            if object_name in result and (pysss_nss_idmap.SID_KEY in result[object_name]):
                object_sid = result[object_name][pysss_nss_idmap.SID_KEY]
                group_list = pysss.getgrouplist(object_name)

        if not group_list:
            return self.__get_trusted_domain_user_and_groups(object_name)

        group_sids = pysss_nss_idmap.getsidbyname(group_list)
        return (object_sid, [el[1][pysss_nss_idmap.SID_KEY] for el in group_sids.items()])

    def __sid_to_str(self, sid):
        """
        Converts binary SID to string representation
        Returns unicode string
        """
        sid_rev_num = ord(sid[0])
        number_sub_id = ord(sid[1])
        ia = struct.unpack('!Q','\x00\x00'+sid[2:8])[0]
        subs = [
            struct.unpack('<I',sid[8+4*i:12+4*i])[0]
            for i in range(number_sub_id)
        ]
        return u'S-%d-%d-%s' % ( sid_rev_num, ia, '-'.join([str(s) for s in subs]),)

    def kinit_as_http(self, domain):
        """
        Initializes ccache with http service credentials.

        Applies session code defaults for ccache directory and naming prefix.
        Session code uses krbccache_prefix+<pid>, we use
        krbccache_prefix+<TD>+<domain netbios name> so there is no clash.

        Returns tuple (ccache path, principal) where (None, None) signifes an
        error on ccache initialization
        """

        domain_suffix = domain.replace('.', '-')

        ccache_name = "%sTD%s" % (krbccache_prefix, domain_suffix)
        ccache_path = os.path.join(krbccache_dir, ccache_name)

        realm = api.env.realm
        hostname = api.env.host
        principal = 'HTTP/%s@%s' % (hostname, realm)
        keytab = '/etc/httpd/conf/ipa.keytab'

        # Destroy the contents of the ccache
        root_logger.debug('Destroying the contents of the separate ccache')

        (stdout, stderr, returncode) = ipautil.run(
            ['/usr/bin/kdestroy', '-A', '-c', ccache_path],
            env={'KRB5CCNAME': ccache_path},
            raiseonerr=False)

        # Destroy the contents of the ccache
        root_logger.debug('Running kinit from ipa.keytab to obtain HTTP '
                          'service principal with MS-PAC attached.')

        (stdout, stderr, returncode) = ipautil.run(
            ['/usr/bin/kinit', '-kt', keytab, principal],
            env={'KRB5CCNAME': ccache_path},
            raiseonerr=False)

        if returncode == 0:
            return (ccache_path, principal)
        else:
            return (None, None)

    def search_in_dc(self, domain, filter, attrs, scope, basedn=None,
                     quiet=False):
        """
        Perform LDAP search in a trusted domain `domain' Domain Controller.
        Returns resulting entries or None.
        """

        entries = None

        info = self.__retrieve_trusted_domain_gc_list(domain)

        if not info:
            raise errors.ValidationError(
                name=_('Trust setup'),
                error=_('Cannot retrieve trusted domain GC list'))

        for (host, port) in info['gc']:
            entries = self.__search_in_dc(info, host, port, filter, attrs,
                                          scope, basedn=basedn,
                                          quiet=quiet)
            if entries:
                break

        return entries

    def __search_in_dc(self, info, host, port, filter, attrs, scope,
                       basedn=None, quiet=False):
        """
        Actual search in AD LDAP server, using SASL GSSAPI authentication
        Returns LDAP result or None.
        """

        (ccache_name, principal) = self.kinit_as_http(info['dns_domain'])

        if ccache_name:
            with installutils.private_ccache(path=ccache_name):
                entries = None

                try:
                    conn = IPAdmin(host=host,
                                   port=389,  # query the AD DC
                                   no_schema=True,
                                   decode_attrs=False,
                                   sasl_nocanon=True)
                    # sasl_nocanon used to avoid hard requirement for PTR
                    # records pointing back to the same host name

                    conn.do_sasl_gssapi_bind()

                    if basedn is None:
                        # Use domain root base DN
                        basedn = ipautil.realm_to_suffix(info['dns_domain'])

                    entries = conn.get_entries(basedn, scope, filter, attrs)
                except Exception, e:
                    msg = "Search on AD DC {host}:{port} failed with: {err}"\
                          .format(host=host, port=str(port), err=str(e))
                    if quiet:
                        root_logger.debug(msg)
                    else:
                        root_logger.warning(msg)
                finally:
                    return entries

    def __retrieve_trusted_domain_gc_list(self, domain):
        """
        Retrieves domain information and preferred GC list
        Returns dictionary with following keys
             name       -- NetBIOS name of the trusted domain
             dns_domain -- DNS name of the trusted domain
             gc         -- array of tuples (server, port) for Global Catalog
        """
        if domain in self._info:
            return self._info[domain]

        if not self._creds:
            self._parm = param.LoadParm()
            self._parm.load(os.path.join(ipautil.SHARE_DIR,"smb.conf.empty"))
            self._parm.set('netbios name', self.flatname)
            self._creds = credentials.Credentials()
            self._creds.set_kerberos_state(credentials.MUST_USE_KERBEROS)
            self._creds.guess(self._parm)
            self._creds.set_workstation(self.flatname)

        netrc = net.Net(creds=self._creds, lp=self._parm)
        finddc_error = None
        result = None
        try:
            result = netrc.finddc(domain=domain, flags=nbt.NBT_SERVER_LDAP | nbt.NBT_SERVER_GC | nbt.NBT_SERVER_CLOSEST)
        except RuntimeError, e:
            finddc_error = e

        if not self._domains:
            self._domains = self.get_trusted_domains()

        info = dict()
        servers = []

        if result:
            info['name'] = unicode(result.domain_name)
            info['dns_domain'] = unicode(result.dns_domain)
            servers = [(unicode(result.pdc_dns_name), 3268)]
        else:
            info['name'] = self._domains[domain]
            info['dns_domain'] = domain
            # Retrieve GC servers list
            gc_name = '_gc._tcp.%s.' % info['dns_domain']

            try:
                answers = resolver.query(gc_name, rdatatype.SRV)
            except DNSException, e:
                answers = []

            for answer in answers:
                server = str(answer.target).rstrip(".")
                servers.append((server, answer.port))

        info['gc'] = servers

        # Both methods should not fail at the same time
        if finddc_error and len(info['gc']) == 0:
            raise assess_dcerpc_exception(message=str(finddc_error))

        self._info[domain] = info
        return info

def string_to_array(what):
    blob = [0] * len(what)

    for i in range(len(what)):
        blob[i] = ord(what[i])
    return blob

class TrustDomainInstance(object):

    def __init__(self, hostname, creds=None):
        self.parm = param.LoadParm()
        self.parm.load(os.path.join(ipautil.SHARE_DIR,"smb.conf.empty"))
        if len(hostname) > 0:
            self.parm.set('netbios name', hostname)
        self.creds = creds
        self.hostname = hostname
        self.info = {}
        self._pipe = None
        self._policy_handle = None
        self.read_only = False
        self.ftinfo_records = None

    def __gen_lsa_connection(self, binding):
       if self.creds is None:
           raise errors.RequirementError(name=_('CIFS credentials object'))
       try:
           result = lsa.lsarpc(binding, self.parm, self.creds)
           return result
       except RuntimeError, (num, message):
           raise assess_dcerpc_exception(num=num, message=message)

    def __init_lsa_pipe(self, remote_host):
        """
        Try to initialize connection to the LSA pipe at remote host.
        This method tries consequently all possible transport options
        and selects one that works. See __gen_lsa_bindings() for details.

        The actual result may depend on details of existing credentials.
        For example, using signing causes NO_SESSION_KEY with Win2K8 and
        using kerberos against Samba with signing does not work.
        """
        # short-cut: if LSA pipe is initialized, skip completely
        if self._pipe:
            return

        attempts = 0
        bindings = self.__gen_lsa_bindings(remote_host)
        for binding in bindings:
            try:
                self._pipe = self.__gen_lsa_connection(binding)
                if self._pipe:
                    break
            except errors.ACIError, e:
                attempts = attempts + 1

        if self._pipe is None and attempts == len(bindings):
            raise errors.ACIError(
                info=_('CIFS server %(host)s denied your credentials') % dict(host=remote_host))

        if self._pipe is None:
            raise errors.RemoteRetrieveError(
                reason=_('Cannot establish LSA connection to %(host)s. Is CIFS server running?') % dict(host=remote_host))
        self.binding = binding

    def __gen_lsa_bindings(self, remote_host):
        """
        There are multiple transports to issue LSA calls. However, depending on a
        system in use they may be blocked by local operating system policies.
        Generate all we can use. __init_lsa_pipe() will try them one by one until
        there is one working.

        We try NCACN_NP before NCACN_IP_TCP and signed sessions before unsigned.
        """
        transports = (u'ncacn_np', u'ncacn_ip_tcp')
        options = ( u',', u'')
        binding_template=lambda x,y,z: u'%s:%s[%s]' % (x, y, z)
        return [binding_template(t, remote_host, o) for t in transports for o in options]

    def retrieve_anonymously(self, remote_host, discover_srv=False):
        """
        When retrieving DC information anonymously, we can't get SID of the domain
        """
        netrc = net.Net(creds=self.creds, lp=self.parm)
        try:
            if discover_srv:
                result = netrc.finddc(domain=remote_host, flags=nbt.NBT_SERVER_LDAP | nbt.NBT_SERVER_DS)
            else:
                result = netrc.finddc(address=remote_host, flags=nbt.NBT_SERVER_LDAP | nbt.NBT_SERVER_DS)
        except RuntimeError, e:
            raise assess_dcerpc_exception(message=str(e))

        if not result:
            return False
        self.info['name'] = unicode(result.domain_name)
        self.info['dns_domain'] = unicode(result.dns_domain)
        self.info['dns_forest'] = unicode(result.forest)
        self.info['guid'] = unicode(result.domain_uuid)
        self.info['dc'] = unicode(result.pdc_dns_name)

        # Netlogon response doesn't contain SID of the domain.
        # We need to do rootDSE search with LDAP_SERVER_EXTENDED_DN_OID control to reveal the SID
        ldap_uri = 'ldap://%s' % (result.pdc_dns_name)
        conn = _ldap.initialize(ldap_uri)
        conn.set_option(_ldap.OPT_SERVER_CONTROLS, [ExtendedDNControl()])
        search_result = None
        try:
            (objtype, res) = conn.search_s('', _ldap.SCOPE_BASE)[0]
            search_result = res['defaultNamingContext'][0]
            self.info['dns_hostname'] = res['dnsHostName'][0]
        except _ldap.LDAPError, e:
            root_logger.error(
                "LDAP error when connecting to %(host)s: %(error)s" %
                    dict(host=unicode(result.pdc_name), error=str(e)))
        except KeyError, e:
            root_logger.error("KeyError: {err}, LDAP entry from {host} "
                              "returned malformed. Your DNS might be "
                              "misconfigured."
                              .format(host=unicode(result.pdc_name),
                                      err=unicode(e)))

        if search_result:
            self.info['sid'] = self.parse_naming_context(search_result)
        return True

    def parse_naming_context(self, context):
        naming_ref = re.compile('.*<SID=(S-.*)>.*')
        return naming_ref.match(context).group(1)

    def retrieve(self, remote_host):
        self.__init_lsa_pipe(remote_host)

        objectAttribute = lsa.ObjectAttribute()
        objectAttribute.sec_qos = lsa.QosInfo()
        try:
            self._policy_handle = self._pipe.OpenPolicy2(u"", objectAttribute, security.SEC_FLAG_MAXIMUM_ALLOWED)
            result = self._pipe.QueryInfoPolicy2(self._policy_handle, lsa.LSA_POLICY_INFO_DNS)
        except RuntimeError, (num, message):
            raise assess_dcerpc_exception(num=num, message=message)

        self.info['name'] = unicode(result.name.string)
        self.info['dns_domain'] = unicode(result.dns_domain.string)
        self.info['dns_forest'] = unicode(result.dns_forest.string)
        self.info['guid'] = unicode(result.domain_guid)
        self.info['sid'] = unicode(result.sid)
        self.info['dc'] = remote_host

    def generate_auth(self, trustdom_secret):
        def arcfour_encrypt(key, data):
            c = RC4.RC4(key)
            return c.update(data)

        password_blob = string_to_array(trustdom_secret.encode('utf-16-le'))

        clear_value = drsblobs.AuthInfoClear()
        clear_value.size = len(password_blob)
        clear_value.password = password_blob

        clear_authentication_information = drsblobs.AuthenticationInformation()
        clear_authentication_information.LastUpdateTime = samba.unix2nttime(int(time.time()))
        clear_authentication_information.AuthType = lsa.TRUST_AUTH_TYPE_CLEAR
        clear_authentication_information.AuthInfo = clear_value

        authentication_information_array = drsblobs.AuthenticationInformationArray()
        authentication_information_array.count = 1
        authentication_information_array.array = [clear_authentication_information]

        outgoing = drsblobs.trustAuthInOutBlob()
        outgoing.count = 1
        outgoing.current = authentication_information_array

        confounder = [3]*512
        for i in range(512):
            confounder[i] = random.randint(0, 255)

        trustpass = drsblobs.trustDomainPasswords()


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