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dcerpc.py
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# Authors:
# Alexander Bokovoy <[email protected]>
#
# Copyright (C) 2011-2016 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
import logging
import re
import time
from ipalib import api, _
from ipalib import errors
from ipapython import ipautil
from ipapython.dn import DN
from ipaserver.install import installutils
from ipalib.util import normalize_name
import os
import struct
import random
# TODO: Remove pylint disable when Python 3 bindings are available.
# pylint: disable=import-error
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
from samba import arcfour_encrypt
import samba
# pylint: enable=import-error
import ldap as _ldap
from ipapython import ipaldap
from dns import resolver, rdatatype
from dns.exception import DNSException
import pysss_nss_idmap
import pysss
import six
from ipaplatform.paths import paths
from ldap.filter import escape_filter_chars
from time import sleep
try:
from ldap.controls import RequestControl as LDAPControl
except ImportError:
from ldap.controls import LDAPControl as LDAPControl
if six.PY3:
unicode = str
long = int
__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.
""")
logger = logging.getLogger(__name__)
# Both constants can be used as masks against trust direction
# because bi-directional has two lower bits set.
TRUST_ONEWAY = 1
TRUST_BIDIRECTIONAL = 3
# Trust join behavior
# External trust -- allow creating trust to a non-root domain in the forest
TRUST_JOIN_EXTERNAL = 1
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')),
-1073741776: # NT_STATUS_INVALID_PARAMETER_MIX,
# we simply will skip the binding
access_denied_error,
-1073741772: # NT_STATUS_OBJECT_NAME_NOT_FOUND
errors.NotFound(
reason=_('Cannot find specified domain or server name')),
}
dcerpc_error_messages = {
"NT_STATUS_OBJECT_NAME_NOT_FOUND":
errors.NotFound(
reason=_('Cannot find specified domain or server name')),
"The object name is not found.":
errors.NotFound(
reason=_('Cannot find specified domain or server name')),
"WERR_NO_LOGON_SERVERS":
errors.RemoteRetrieveError(
reason=_('AD DC was unable to reach any IPA domain controller. '
'Most likely it is a DNS or firewall issue')),
# This is a very long key, don't change it
"There are currently no logon servers available to "
"service the logon request.":
errors.RemoteRetrieveError(
reason=_('AD DC was unable to reach any IPA domain controller. '
'Most likely it is a DNS or firewall issue')),
"NT_STATUS_INVALID_PARAMETER_MIX":
errors.RequirementError(
name=_('At least the domain or IP address should be specified')),
}
pysss_type_key_translation_dict = {
pysss_nss_idmap.ID_USER: 'user',
pysss_nss_idmap.ID_GROUP: 'group',
# Used for users with magic private groups
pysss_nss_idmap.ID_BOTH: 'both',
}
class TrustTopologyConflictSolved(Exception):
"""
Internal trust error: raised when previously detected
trust topology conflict is automatically solved.
No separate errno is assigned as this error should
not be visible outside the dcerpc.py code.
"""
pass
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._admin_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:
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 = entry_attrs.dn
self.domain = self.api.env.domain
except errors.NotFound:
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 e in entries:
try:
t_partner = e.single_value.get(self.ATTR_TRUST_PARTNER)
fname_norm = e.single_value.get(self.ATTR_FLATNAME).lower()
trusted_sid = e.single_value.get(self.ATTR_TRUSTED_SID)
except KeyError as exc:
# Some piece of trusted domain info in LDAP is missing
# Skip the domain, but leave log entry for investigation
logger.warning("Trusted domain '%s' entry misses an "
"attribute: %s", e.dn, exc)
continue
result[t_partner] = (fname_norm,
security.dom_sid(trusted_sid))
return result
except errors.NotFound as exc:
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,
fallback_to_ldap=True):
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
# If fallback to AD DC LDAP is not allowed, bail out
if not fallback_to_ldap:
raise errors.ValidationError(name=_('trusted domain object'),
error=_('SSSD was unable to resolve '
'the object to a valid 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]['objectSid'][0])
try:
test_sid = security.dom_sid(sid)
return unicode(test_sid)
except TypeError:
raise errors.ValidationError(name=_('trusted domain object'),
error=_('Trusted domain did not '
'return a valid SID for '
'the object'))
def get_trusted_domain_object_type(self, name_or_sid):
"""
Return the type of the object corresponding to the given name in
the trusted domain, which is either 'user', 'group' or 'both'.
The 'both' types is used for users with magic private groups.
"""
object_type = None
if is_sid_valid(name_or_sid):
result = pysss_nss_idmap.getnamebysid(name_or_sid)
else:
result = pysss_nss_idmap.getsidbyname(name_or_sid)
if name_or_sid in result:
object_type = result[name_or_sid].get(pysss_nss_idmap.TYPE_KEY)
# Do the translation to hide pysss_nss_idmap constants
# from higher-level code
return pysss_type_key_translation_dict.get(object_type)
def get_trusted_domain_object_from_sid(self, sid):
logger.debug("Converting SID to object name: %s", sid)
# Check if the given SID is valid
if not self.is_trusted_sid_valid(sid):
raise errors.ValidationError(name='sid', error='SID is not valid')
# Use pysss_nss_idmap to obtain the name
result = pysss_nss_idmap.getnamebysid(sid).get(sid)
valid_types = (pysss_nss_idmap.ID_USER,
pysss_nss_idmap.ID_GROUP,
pysss_nss_idmap.ID_BOTH)
if result:
if result.get(pysss_nss_idmap.TYPE_KEY) in valid_types:
return result.get(pysss_nss_idmap.NAME_KEY)
# If unsuccessful, search AD DC LDAP
logger.debug("Searching AD DC LDAP")
escaped_sid = escape_filter_chars(
security.dom_sid(sid).__ndr_pack__(),
2 # 2 means every character needs to be escaped
)
attrs = ['sAMAccountName']
filter = (r'(&(objectSid=%(sid)s)'
'(|(objectClass=user)(objectClass=group)))'
% dict(sid=escaped_sid)) # sid in binary
domain = self.get_domain_by_sid(sid)
entries = self.get_trusted_domain_objects(domain=domain,
filter=filter,
attrs=attrs)
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'))
object_name = (
"%s@%s" % (entries[0].single_value['sAMAccountName'].lower(),
domain.lower())
)
return unicode(object_name)
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].dn
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].dn
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]['objectSid'][0])
group_sids = [self.__sid_to_str(sid)
for sid in entries[0]['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_administrator(self, domain):
"""
Initializes ccache with http service credentials.
Applies session code defaults for ccache directory and naming prefix.
Session code uses kinit_+<pid>, we use
kinit_+<TD>+<domain netbios name> so there is no clash.
Returns tuple (ccache path, principal) where (None, None) signifes an
error on ccache initialization
"""
if self._admin_creds is None:
return (None, None)
domain_suffix = domain.replace('.', '-')
ccache_name = "kinit_TDA%s" % (domain_suffix)
ccache_path = os.path.join(paths.IPA_CCACHES, ccache_name)
(principal, password) = self._admin_creds.split('%', 1)
# Destroy the contents of the ccache
logger.debug('Destroying the contents of the separate ccache')
ipautil.run(
[paths.KDESTROY, '-A', '-c', ccache_path],
env={'KRB5CCNAME': ccache_path},
raiseonerr=False)
# Destroy the contents of the ccache
logger.debug('Running kinit with credentials of AD administrator')
result = ipautil.run(
[paths.KINIT, principal],
env={'KRB5CCNAME': ccache_path},
stdin=password,
raiseonerr=False)
if result.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 = None
if self._admin_creds:
(ccache_name,
_principal) = self.kinit_as_administrator(info['dns_domain'])
if ccache_name:
with ipautil.private_ccache(path=ccache_name):
entries = None
try:
ldap_uri = ipaldap.get_ldap_uri(host)
conn = ipaldap.LDAPClient(
ldap_uri,
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.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 as e:
msg = "Search on AD DC {host}:{port} failed with: {err}"\
.format(host=host, port=str(port), err=str(e))
if quiet:
logger.debug('%s', msg)
else:
logger.warning('%s', msg)
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(paths.USR_SHARE_IPA_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
flags = nbt.NBT_SERVER_LDAP | nbt.NBT_SERVER_GC | nbt.NBT_SERVER_CLOSEST
try:
result = netrc.finddc(domain=domain, flags=flags)
except RuntimeError as e:
try:
# If search of closest GC failed, attempt to find any one
flags = nbt.NBT_SERVER_LDAP | nbt.NBT_SERVER_GC
result = netrc.finddc(domain=domain, flags=flags)
except RuntimeError as 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 as 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:
num, message = e.args # pylint: disable=unpacking-non-sequence
raise assess_dcerpc_exception(num=num, message=message)
self._info[domain] = info
return info
def string_to_array(what):
return [ord(v) for v in what]
class TrustDomainInstance(object):
def __init__(self, hostname, creds=None):
self.parm = param.LoadParm()
self.parm.load(os.path.join(paths.USR_SHARE_IPA_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
self.validation_attempts = 0
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 as e:
num, message = e.args # pylint: disable=unpacking-non-sequence
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
session_attempts = 0
bindings = self.__gen_lsa_bindings(remote_host)
for binding in bindings:
try:
self._pipe = self.__gen_lsa_connection(binding)
if self._pipe and self._pipe.session_key:
break
except errors.ACIError:
attempts = attempts + 1
except RuntimeError:
# When session key is not available, we just skip this binding
session_attempts = session_attempts + 1
if self._pipe is None and \
(attempts + session_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
self.session_key = self._pipe.session_key
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 use SMB2 before SMB1.
"""
transports = (u'ncacn_np', u'ncacn_ip_tcp')
options = (u'smb2,print', u'print')
return [u'%s:%s[%s]' % (t, remote_host, o)
for t in transports for o in options]
def retrieve_anonymously(self, remote_host,
discover_srv=False, search_pdc=False):
"""
When retrieving DC information anonymously, we can't get SID of the domain
"""
netrc = net.Net(creds=self.creds, lp=self.parm)
flags = nbt.NBT_SERVER_LDAP | nbt.NBT_SERVER_DS | nbt.NBT_SERVER_WRITABLE
if search_pdc:
flags = flags | nbt.NBT_SERVER_PDC
try:
if discover_srv:
result = netrc.finddc(domain=remote_host, flags=flags)
else:
result = netrc.finddc(address=remote_host, flags=flags)
except RuntimeError as e:
num, message = e.args # pylint: disable=unpacking-non-sequence
raise assess_dcerpc_exception(num=num, message=message)
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)
self.info['is_pdc'] = (result.server_type & nbt.NBT_SERVER_PDC) != 0
# 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 as e:
logger.error(
"LDAP error when connecting to %s: %s",
unicode(result.pdc_name), str(e))
except KeyError as e:
logger.error("KeyError: %s, LDAP entry from %s "
"returned malformed. Your DNS might be "
"misconfigured.",
unicode(e),
unicode(result.pdc_name))
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 unicode(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 as e:
num, message = e.args # pylint: disable=unpacking-non-sequence
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
try:
result = self._pipe.QueryInfoPolicy2(self._policy_handle,
lsa.LSA_POLICY_INFO_ROLE)
except RuntimeError as e:
num, message = e.args # pylint: disable=unpacking-non-sequence
raise assess_dcerpc_exception(num=num, message=message)
self.info['is_pdc'] = (result.role == lsa.LSA_ROLE_PRIMARY)
def generate_auth(self, trustdom_secret):
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