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a6ff85f425
When using ipaExternalGroup/ipaExternalMember attributes it is possible to add group members which don't exist in IPA database. This is primarily is required for AD trusts support and therefore validation is accepting only secure identifier (SID) format. https://fedorahosted.org/freeipa/ticket/2664
402 lines
16 KiB
Python
402 lines
16 KiB
Python
# Authors:
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# Alexander Bokovoy <abokovoy@redhat.com>
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#
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# Copyright (C) 2011 Red Hat
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# see file 'COPYING' for use and warranty information
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#
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# Portions (C) Andrew Tridgell, Andrew Bartlett
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Make sure we only run this module at the server where samba4-python
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# package is installed to avoid issues with unavailable modules
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from ipalib.plugins.baseldap import *
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from ipalib import api, Str, Password, DefaultFrom, _, ngettext, Object
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from ipalib.parameters import Enum
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from ipalib import Command
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from ipalib import errors
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from ipapython import ipautil
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from ipaserver.install import installutils
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import os, string, struct, copy
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import uuid
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from samba import param
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from samba import credentials
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from samba.dcerpc import security, lsa, drsblobs, nbt
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from samba.ndr import ndr_pack
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from samba import net
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import samba
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import random
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import ldap as _ldap
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from Crypto.Cipher import ARC4
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__doc__ = _("""
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Classes to manage trust joins using DCE-RPC calls
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The code in this module relies heavily on samba4-python package
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and Samba4 python bindings.
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""")
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class ExtendedDNControl(_ldap.controls.RequestControl):
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def __init__(self):
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self.controlType = "1.2.840.113556.1.4.529"
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self.criticality = False
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self.integerValue = 1
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def encodeControlValue(self):
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return '0\x03\x02\x01\x01'
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class DomainValidator(object):
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ATTR_FLATNAME = 'ipantflatname'
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ATTR_SID = 'ipantsecurityidentifier'
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ATTR_TRUSTED_SID = 'ipanttrusteddomainsid'
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def __init__(self, api):
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self.api = api
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self.ldap = self.api.Backend.ldap2
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self.domain = None
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self.flatname = None
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self.dn = None
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self.sid = None
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self._domains = None
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def is_configured(self):
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cn_trust_local = DN(('cn', self.api.env.domain), self.api.env.container_cifsdomains, self.api.env.basedn)
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try:
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(dn, entry_attrs) = self.ldap.get_entry(unicode(cn_trust_local), [self.ATTR_FLATNAME, self.ATTR_SID])
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self.flatname = entry_attrs[self.ATTR_FLATNAME][0]
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self.sid = entry_attrs[self.ATTR_SID][0]
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self.dn = dn
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self.domain = self.api.env.domain
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except errors.NotFound, e:
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return False
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return True
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def get_trusted_domains(self):
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cn_trust = DN(('cn', 'ad'), self.api.env.container_trusts, self.api.env.basedn)
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try:
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search_kw = {'objectClass': 'ipaNTTrustedDomain'}
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filter = self.ldap.make_filter(search_kw, rules=self.ldap.MATCH_ALL)
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(entries, truncated) = self.ldap.find_entries(filter=filter, base_dn=unicode(cn_trust),
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attrs_list=[self.ATTR_TRUSTED_SID, 'dn'])
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return entries
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except errors.NotFound, e:
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return []
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def is_trusted_sid_valid(self, sid):
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if not self.domain:
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# our domain is not configured or self.is_configured() never run
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# reject SIDs as we can't check correctness of them
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return False
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# Parse sid string to see if it is really in a SID format
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try:
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test_sid = security.dom_sid(sid)
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except TypeError:
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return False
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(dom, sid_rid) = test_sid.split()
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sid_dom = str(dom)
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# Now we have domain prefix of the sid as sid_dom string and can
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# analyze it against known prefixes
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if sid_dom.find(security.SID_NT_AUTHORITY) != 0:
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# Ignore any potential SIDs that are not S-1-5-*
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return False
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if sid_dom.find(self.sid) == 0:
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# A SID from our own domain cannot be treated as trusted domain's SID
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return False
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# At this point we have SID_NT_AUTHORITY family SID and really need to
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# check it against prefixes of domain SIDs we trust to
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if not self._domains:
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self._domains = self.get_trusted_domains()
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if len(self._domains) == 0:
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# Our domain is configured but no trusted domains are configured
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# This means we can't check the correctness of a trusted domain SIDs
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return False
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# We have non-zero list of trusted domains and have to go through them
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# one by one and check their sids as prefixes
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for (dn, domaininfo) in self._domains:
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if sid_dom.find(domaininfo[self.ATTR_TRUSTED_SID][0]) == 0:
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return True
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return False
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class TrustDomainInstance(object):
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def __init__(self, hostname, creds=None):
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self.parm = param.LoadParm()
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self.parm.load(os.path.join(ipautil.SHARE_DIR,"smb.conf.empty"))
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if len(hostname) > 0:
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self.parm.set('netbios name', hostname)
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self.creds = creds
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self.hostname = hostname
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self.info = {}
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self._pipe = None
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self._policy_handle = None
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self.read_only = False
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def __gen_lsa_connection(self, binding):
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if self.creds is None:
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raise errors.RequirementError(name='CIFS credentials object')
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try:
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result = lsa.lsarpc(binding, self.parm, self.creds)
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return result
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except:
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return None
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def __init_lsa_pipe(self, remote_host):
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"""
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Try to initialize connection to the LSA pipe at remote host.
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This method tries consequently all possible transport options
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and selects one that works. See __gen_lsa_bindings() for details.
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The actual result may depend on details of existing credentials.
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For example, using signing causes NO_SESSION_KEY with Win2K8 and
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using kerberos against Samba with signing does not work.
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"""
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# short-cut: if LSA pipe is initialized, skip completely
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if self._pipe:
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return
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bindings = self.__gen_lsa_bindings(remote_host)
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for binding in bindings:
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self._pipe = self.__gen_lsa_connection(binding)
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if self._pipe:
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break
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if self._pipe is None:
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raise errors.RequirementError(name='Working LSA pipe')
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def __gen_lsa_bindings(self, remote_host):
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"""
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There are multiple transports to issue LSA calls. However, depending on a
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system in use they may be blocked by local operating system policies.
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Generate all we can use. __init_lsa_pipe() will try them one by one until
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there is one working.
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We try NCACN_NP before NCACN_IP_TCP and signed sessions before unsigned.
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"""
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transports = (u'ncacn_np', u'ncacn_ip_tcp')
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options = ( u',', u'')
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binding_template=lambda x,y,z: u'%s:%s[%s]' % (x, y, z)
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return [binding_template(t, remote_host, o) for t in transports for o in options]
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def retrieve_anonymously(self, remote_host, discover_srv=False):
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"""
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When retrieving DC information anonymously, we can't get SID of the domain
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"""
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netrc = net.Net(creds=self.creds, lp=self.parm)
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if discover_srv:
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result = netrc.finddc(domain=remote_host, flags=nbt.NBT_SERVER_LDAP | nbt.NBT_SERVER_DS)
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else:
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result = netrc.finddc(address=remote_host, flags=nbt.NBT_SERVER_LDAP | nbt.NBT_SERVER_DS)
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if not result:
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return False
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self.info['name'] = unicode(result.domain_name)
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self.info['dns_domain'] = unicode(result.dns_domain)
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self.info['dns_forest'] = unicode(result.forest)
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self.info['guid'] = unicode(result.domain_uuid)
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# Netlogon response doesn't contain SID of the domain.
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# We need to do rootDSE search with LDAP_SERVER_EXTENDED_DN_OID control to reveal the SID
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ldap_uri = 'ldap://%s' % (result.pdc_dns_name)
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conn = _ldap.initialize(ldap_uri)
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conn.set_option(_ldap.OPT_SERVER_CONTROLS, [ExtendedDNControl()])
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result = None
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try:
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(objtype, res) = conn.search_s('', _ldap.SCOPE_BASE)[0]
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result = res['defaultNamingContext'][0]
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self.info['dns_hostname'] = res['dnsHostName'][0]
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except _ldap.LDAPError, e:
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print "LDAP error when connecting to %s: %s" % (unicode(result.pdc_name), str(e))
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if result:
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self.info['sid'] = self.parse_naming_context(result)
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return True
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def parse_naming_context(self, context):
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naming_ref = re.compile('.*<SID=(S-.*)>.*')
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return naming_ref.match(context).group(1)
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def retrieve(self, remote_host):
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self.__init_lsa_pipe(remote_host)
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objectAttribute = lsa.ObjectAttribute()
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objectAttribute.sec_qos = lsa.QosInfo()
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self._policy_handle = self._pipe.OpenPolicy2(u"", objectAttribute, security.SEC_FLAG_MAXIMUM_ALLOWED)
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result = self._pipe.QueryInfoPolicy2(self._policy_handle, lsa.LSA_POLICY_INFO_DNS)
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self.info['name'] = unicode(result.name.string)
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self.info['dns_domain'] = unicode(result.dns_domain.string)
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self.info['dns_forest'] = unicode(result.dns_forest.string)
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self.info['guid'] = unicode(result.domain_guid)
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self.info['sid'] = unicode(result.sid)
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def generate_auth(self, trustdom_secret):
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def arcfour_encrypt(key, data):
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c = ARC4.new(key)
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return c.encrypt(data)
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def string_to_array(what):
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blob = [0] * len(what)
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for i in range(len(what)):
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blob[i] = ord(what[i])
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return blob
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password_blob = string_to_array(trustdom_secret.encode('utf-16-le'))
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clear_value = drsblobs.AuthInfoClear()
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clear_value.size = len(password_blob)
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clear_value.password = password_blob
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clear_authentication_information = drsblobs.AuthenticationInformation()
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clear_authentication_information.LastUpdateTime = samba.unix2nttime(int(time.time()))
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clear_authentication_information.AuthType = lsa.TRUST_AUTH_TYPE_CLEAR
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clear_authentication_information.AuthInfo = clear_value
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authentication_information_array = drsblobs.AuthenticationInformationArray()
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authentication_information_array.count = 1
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authentication_information_array.array = [clear_authentication_information]
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outgoing = drsblobs.trustAuthInOutBlob()
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outgoing.count = 1
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outgoing.current = authentication_information_array
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confounder = [3]*512
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for i in range(512):
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confounder[i] = random.randint(0, 255)
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trustpass = drsblobs.trustDomainPasswords()
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trustpass.confounder = confounder
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trustpass.outgoing = outgoing
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trustpass.incoming = outgoing
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trustpass_blob = ndr_pack(trustpass)
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encrypted_trustpass = arcfour_encrypt(self._pipe.session_key, trustpass_blob)
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auth_blob = lsa.DATA_BUF2()
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auth_blob.size = len(encrypted_trustpass)
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auth_blob.data = string_to_array(encrypted_trustpass)
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auth_info = lsa.TrustDomainInfoAuthInfoInternal()
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auth_info.auth_blob = auth_blob
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self.auth_info = auth_info
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def establish_trust(self, another_domain, trustdom_secret):
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"""
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Establishes trust between our and another domain
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Input: another_domain -- instance of TrustDomainInstance, initialized with #retrieve call
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trustdom_secret -- shared secred used for the trust
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"""
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self.generate_auth(trustdom_secret)
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info = lsa.TrustDomainInfoInfoEx()
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info.domain_name.string = another_domain.info['dns_domain']
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info.netbios_name.string = another_domain.info['name']
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info.sid = security.dom_sid(another_domain.info['sid'])
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info.trust_direction = lsa.LSA_TRUST_DIRECTION_INBOUND | lsa.LSA_TRUST_DIRECTION_OUTBOUND
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info.trust_type = lsa.LSA_TRUST_TYPE_UPLEVEL
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info.trust_attributes = lsa.LSA_TRUST_ATTRIBUTE_FOREST_TRANSITIVE | lsa.LSA_TRUST_ATTRIBUTE_USES_RC4_ENCRYPTION
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try:
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dname = lsa.String()
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dname.string = another_domain.info['dns_domain']
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res = self._pipe.QueryTrustedDomainInfoByName(self._policy_handle, dname, lsa.LSA_TRUSTED_DOMAIN_INFO_FULL_INFO)
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self._pipe.DeleteTrustedDomain(self._policy_handle, res.info_ex.sid)
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except:
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pass
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self._pipe.CreateTrustedDomainEx2(self._policy_handle, info, self.auth_info, security.SEC_STD_DELETE)
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class TrustDomainJoins(object):
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def __init__(self, api):
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self.api = api
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self.local_domain = None
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self.remote_domain = None
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domain_validator = DomainValidator(api)
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self.configured = domain_validator.is_configured()
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if self.configured:
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self.local_flatname = domain_validator.flatname
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self.local_dn = domain_validator.dn
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self.__populate_local_domain()
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def __populate_local_domain(self):
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# Initialize local domain info using kerberos only
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ld = TrustDomainInstance(self.local_flatname)
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ld.creds = credentials.Credentials()
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ld.creds.set_kerberos_state(credentials.MUST_USE_KERBEROS)
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ld.creds.guess(ld.parm)
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ld.creds.set_workstation(ld.hostname)
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ld.retrieve(installutils.get_fqdn())
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self.local_domain = ld
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def __populate_remote_domain(self, realm, realm_server=None, realm_admin=None, realm_passwd=None):
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def get_instance(self):
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# Fetch data from foreign domain using password only
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rd = TrustDomainInstance('')
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rd.parm.set('workgroup', self.local_domain.info['name'])
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rd.creds = credentials.Credentials()
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rd.creds.set_kerberos_state(credentials.DONT_USE_KERBEROS)
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rd.creds.guess(rd.parm)
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return rd
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rd = get_instance(self)
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rd.creds.set_anonymous()
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rd.creds.set_workstation(self.local_domain.hostname)
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if realm_server is None:
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rd.retrieve_anonymously(realm, discover_srv=True)
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else:
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rd.retrieve_anonymously(realm_server, discover_srv=False)
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rd.read_only = True
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if realm_admin and realm_passwd:
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if 'name' in rd.info:
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auth_string = u"%s\%s%%%s" % (rd.info['name'], realm_admin, realm_passwd)
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td = get_instance(self)
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td.creds.parse_string(auth_string)
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td.creds.set_workstation(self.local_domain.hostname)
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if realm_server is None:
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# we must have rd.info['dns_hostname'] then, part of anonymous discovery
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td.retrieve(rd.info['dns_hostname'])
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else:
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td.retrieve(realm_server)
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td.read_only = False
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self.remote_domain = td
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return
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# Otherwise, use anonymously obtained data
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self.remote_domain = rd
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def join_ad_full_credentials(self, realm, realm_server, realm_admin, realm_passwd):
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if not self.configured:
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return None
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self.__populate_remote_domain(realm, realm_server, realm_admin, realm_passwd)
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if not self.remote_domain.read_only:
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trustdom_pass = samba.generate_random_password(128, 128)
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self.remote_domain.establish_trust(self.local_domain, trustdom_pass)
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self.local_domain.establish_trust(self.remote_domain, trustdom_pass)
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return dict(local=self.local_domain, remote=self.remote_domain)
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return None
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def join_ad_ipa_half(self, realm, realm_server, trustdom_passwd):
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if not self.configured:
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return None
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self.__populate_remote_domain(realm, realm_server, realm_passwd=None)
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self.local_domain.establish_trust(self.remote_domain, trustdom_passwd)
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return dict(local=self.local_domain, remote=self.remote_domain)
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