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7b5cc3ed83
freeipa/ipaserver/dcerpc.py
Alexander Bokovoy 7b5cc3ed83 ipaserver/dcerpc: attempt to resolve SIDs through SSSD first 
Attempt to resolve SIDs through SSSD first to avoid using trust
account password. This makes possible to run HBAC test requests
without being in 'trusted admins' group.

https://fedorahosted.org/freeipa/ticket/3803
2013-07-23 16:24:38 +03:00

1021 lines
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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
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')),
}
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 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,
self.ATTR_TRUST_AUTHOUT])
result = dict()
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
trust_authout = entry.get(self.ATTR_TRUST_AUTHOUT, [None])[0]
# We were able to read all Trusted domain attributes but the secret
# User is not member of trust admins group
if trust_authout is None:
raise errors.ACIError(
info=_('communication with trusted domains is allowed '
'for Trusts administrator group members only'))
result[trust_partner] = (flatname_normalized,
security.dom_sid(trusted_sid),
trust_authout)
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 __extract_trusted_auth(self, info):
"""
Returns in clear trusted domain account credentials
"""
clear = None
auth = drsblobs.trustAuthInOutBlob()
auth.__ndr_unpack__(info['auth'])
auth_array = auth.current.array[0]
if auth_array.AuthType == lsa.TRUST_AUTH_TYPE_CLEAR:
clear = ''.join(map(chr, auth_array.AuthInfo.password)).decode('utf-16-le')
return clear
def __kinit_as_trusted_account(self, info, password):
"""
Initializes ccache with trusted domain account 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 name, principal) where (None, None) signifes an error
on ccache initialization
"""
ccache_name = os.path.join(krbccache_dir, "%sTD%s" % (krbccache_prefix, info['name'][0]))
principal = '%s$@%s' % (self.flatname, info['dns_domain'].upper())
(stdout, stderr, returncode) = ipautil.run(['/usr/bin/kinit', principal],
env={'KRB5CCNAME':ccache_name},
stdin=password, raiseonerr=False)
if returncode == 0:
return (ccache_name, principal)
else:
if returncode == 1:
raise errors.ACIError(
info=_("KDC for %(domain)s denied trust account for IPA domain with a message '%(message)s'") %
dict(domain=info['dns_domain'],message=stderr.strip()))
return (None, None)
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,
use_http=False, quiet=False):
"""
Perform LDAP search in a trusted domain `domain' Domain Controller.
Returns resulting entries or None.
If use_http is set to True, the search is conducted using
HTTP service credentials.
"""
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,
use_http=use_http,
quiet=quiet)
if entries:
break
return entries
def __search_in_dc(self, info, host, port, filter, attrs, scope,
basedn=None, use_http=False, quiet=False):
"""
Actual search in AD LDAP server, using SASL GSSAPI authentication
Returns LDAP result or None.
"""
if use_http:
(ccache_name, principal) = self.kinit_as_http(info['dns_domain'])
else:
auth = self.__extract_trusted_auth(info)
if not auth:
return None
(ccache_name, principal) = self.__kinit_as_trusted_account(info,
auth)
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
auth -- encrypted credentials for trusted domain account
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()
info['auth'] = self._domains[domain][2]
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
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
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()])
result = None
try:
(objtype, res) = conn.search_s('', _ldap.SCOPE_BASE)[0]
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)))
if result:
self.info['sid'] = self.parse_naming_context(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)
def string_to_array(what):
blob = [0] * len(what)
for i in range(len(what)):
blob[i] = ord(what[i])
return blob
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()
trustpass.confounder = confounder
trustpass.outgoing = outgoing
trustpass.incoming = outgoing
trustpass_blob = ndr_pack(trustpass)
encrypted_trustpass = arcfour_encrypt(self._pipe.session_key, trustpass_blob)
auth_blob = lsa.DATA_BUF2()
auth_blob.size = len(encrypted_trustpass)
auth_blob.data = string_to_array(encrypted_trustpass)
auth_info = lsa.TrustDomainInfoAuthInfoInternal()
auth_info.auth_blob = auth_blob
self.auth_info = auth_info
def establish_trust(self, another_domain, trustdom_secret):
"""
Establishes trust between our and another domain
Input: another_domain -- instance of TrustDomainInstance, initialized with #retrieve call
trustdom_secret -- shared secred used for the trust
"""
self.generate_auth(trustdom_secret)
info = lsa.TrustDomainInfoInfoEx()
info.domain_name.string = another_domain.info['dns_domain']
info.netbios_name.string = another_domain.info['name']
info.sid = security.dom_sid(another_domain.info['sid'])
info.trust_direction = lsa.LSA_TRUST_DIRECTION_INBOUND | lsa.LSA_TRUST_DIRECTION_OUTBOUND
info.trust_type = lsa.LSA_TRUST_TYPE_UPLEVEL
info.trust_attributes = lsa.LSA_TRUST_ATTRIBUTE_FOREST_TRANSITIVE
if self.info['name'] == info.netbios_name.string:
# Check that NetBIOS names do not clash
raise errors.ValidationError(name=u'AD Trust Setup',
error=_('the IPA server and the remote domain cannot share the same '
'NetBIOS name: %s') % self.info['name'])
try:
dname = lsa.String()
dname.string = another_domain.info['dns_domain']
res = self._pipe.QueryTrustedDomainInfoByName(self._policy_handle, dname, lsa.LSA_TRUSTED_DOMAIN_INFO_FULL_INFO)
self._pipe.DeleteTrustedDomain(self._policy_handle, res.info_ex.sid)
except RuntimeError, e:
pass
try:
trustdom_handle = self._pipe.CreateTrustedDomainEx2(self._policy_handle, info, self.auth_info, security.SEC_STD_DELETE)
except RuntimeError, (num, message):
raise assess_dcerpc_exception(num=num, message=message)
try:
infoclass = lsa.TrustDomainInfoSupportedEncTypes()
infoclass.enc_types = security.KERB_ENCTYPE_RC4_HMAC_MD5
infoclass.enc_types |= security.KERB_ENCTYPE_AES128_CTS_HMAC_SHA1_96
infoclass.enc_types |= security.KERB_ENCTYPE_AES256_CTS_HMAC_SHA1_96
self._pipe.SetInformationTrustedDomain(trustdom_handle, lsa.LSA_TRUSTED_DOMAIN_SUPPORTED_ENCRYPTION_TYPES, infoclass)
except RuntimeError, e:
pass
def verify_trust(self, another_domain):
def retrieve_netlogon_info_2(domain, function_code, data):
try:
netr_pipe = netlogon.netlogon(domain.binding, domain.parm, domain.creds)
result = netr_pipe.netr_LogonControl2Ex(logon_server=None,
function_code=function_code,
level=2,
data=data
)
return result
except RuntimeError, (num, message):
raise assess_dcerpc_exception(num=num, message=message)
result = retrieve_netlogon_info_2(self,
netlogon.NETLOGON_CONTROL_TC_VERIFY,
another_domain.info['dns_domain'])
if (result and (result.flags and netlogon.NETLOGON_VERIFY_STATUS_RETURNED)):
# netr_LogonControl2Ex() returns non-None result only if overall call
# result was WERR_OK which means verification was correct.
# We only check that it was indeed status for verification process
return True
return False
class TrustDomainJoins(object):
def __init__(self, api):
self.api = api
self.local_domain = None
self.remote_domain = None
domain_validator = DomainValidator(api)
self.configured = domain_validator.is_configured()
if self.configured:
self.local_flatname = domain_validator.flatname
self.local_dn = domain_validator.dn
self.__populate_local_domain()
def __populate_local_domain(self):
# Initialize local domain info using kerberos only
ld = TrustDomainInstance(self.local_flatname)
ld.creds = credentials.Credentials()
ld.creds.set_kerberos_state(credentials.MUST_USE_KERBEROS)
ld.creds.guess(ld.parm)
ld.creds.set_workstation(ld.hostname)
ld.retrieve(installutils.get_fqdn())
self.local_domain = ld
def populate_remote_domain(self, realm, realm_server=None, realm_admin=None, realm_passwd=None):
def get_instance(self):
# Fetch data from foreign domain using password only
rd = TrustDomainInstance('')
rd.parm.set('workgroup', self.local_domain.info['name'])
rd.creds = credentials.Credentials()
rd.creds.set_kerberos_state(credentials.DONT_USE_KERBEROS)
rd.creds.guess(rd.parm)
return rd
rd = get_instance(self)
rd.creds.set_anonymous()
rd.creds.set_workstation(self.local_domain.hostname)
if realm_server is None:
rd.retrieve_anonymously(realm, discover_srv=True)
else:
rd.retrieve_anonymously(realm_server, discover_srv=False)
rd.read_only = True
if realm_admin and realm_passwd:
if 'name' in rd.info:
names = realm_admin.split('\\')
if len(names) > 1:
# realm admin is in DOMAIN\user format
# strip DOMAIN part as we'll enforce the one discovered
realm_admin = names[-1]
auth_string = u"%s\%s%%%s" % (rd.info['name'], realm_admin, realm_passwd)
td = get_instance(self)
td.creds.parse_string(auth_string)
td.creds.set_workstation(self.local_domain.hostname)
if realm_server is None:
# we must have rd.info['dns_hostname'] then, part of anonymous discovery
td.retrieve(rd.info['dns_hostname'])
else:
td.retrieve(realm_server)
td.read_only = False
self.remote_domain = td
return
# Otherwise, use anonymously obtained data
self.remote_domain = rd
def join_ad_full_credentials(self, realm, realm_server, realm_admin, realm_passwd):
if not self.configured:
return None
if not(isinstance(self.remote_domain, TrustDomainInstance)):
self.populate_remote_domain(
realm,
realm_server,
realm_admin,
realm_passwd
)
if not self.remote_domain.read_only:
trustdom_pass = samba.generate_random_password(128, 128)
self.remote_domain.establish_trust(self.local_domain, trustdom_pass)
self.local_domain.establish_trust(self.remote_domain, trustdom_pass)
result = self.remote_domain.verify_trust(self.local_domain)
return dict(local=self.local_domain, remote=self.remote_domain, verified=result)
return None
def join_ad_ipa_half(self, realm, realm_server, trustdom_passwd):
if not self.configured:
return None
if not(isinstance(self.remote_domain, TrustDomainInstance)):
self.populate_remote_domain(realm, realm_server, realm_passwd=None)
self.local_domain.establish_trust(self.remote_domain, trustdom_passwd)
return dict(local=self.local_domain, remote=self.remote_domain, verified=False)
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