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From efdbea05f716700d8ed659430a6b501b41de0e54 Mon Sep 17 00:00:00 2001
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From: Alexander Bokovoy <abokovoy@redhat.com>
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Date: Thu, 19 Oct 2017 13:21:05 +0300
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Subject: [PATCH] adtrust: filter out subdomains when defining our topology to
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AD
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When definining a topology of a forest to be visible over a cross-forest
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trust, we set *.<forest name> as all-catch top level name already.
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This means that all DNS subdomains of the forest will already be matched
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by this top level name (TLN). If we add more TLNs for subdomains, Active
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Directory will respond with NT_STATUS_INVALID_PARAMETER.
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Filter out all subdomains of the forest root domain. All other realm
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domains will be added with explicit TLN records.
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Also filter out single label domains. These aren't possible to add as
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TLNs to Windows Server 2016 as it considers them incorrect. Given that
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we do not allow single lable domains as part of freeIPA installs, this
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is another layer of protection here.
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Fixes https://pagure.io/freeipa/issue/6666
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Reviewed-By: Christian Heimes <cheimes@redhat.com>
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---
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ipaserver/dcerpc.py | 16 ++++++++++++++++
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1 file changed, 16 insertions(+)
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diff --git a/ipaserver/dcerpc.py b/ipaserver/dcerpc.py
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index d684a17cabe43bbbd43d29f75f534b6e50fccd12..aa63cd9db0a1d47b5309cc6bed2ff7584760a39d 100644
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--- a/ipaserver/dcerpc.py
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+++ b/ipaserver/dcerpc.py
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@@ -50,6 +50,7 @@ import samba
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import ldap as _ldap
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from ipapython import ipaldap
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+from ipapython.dnsutil import DNSName
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from dns import resolver, rdatatype
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from dns.exception import DNSException
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import pysss_nss_idmap
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@@ -1589,7 +1590,22 @@ class TrustDomainJoins(object):
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entry.single_value.get('modifytimestamp').timetuple()
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)*1e7+116444736000000000)
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+ forest = DNSName(self.local_domain.info['dns_forest'])
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+ # tforest is IPA forest. keep the line below for future checks
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+ # tforest = DNSName(self.remote_domain.info['dns_forest'])
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for dom in realm_domains['associateddomain']:
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+ d = DNSName(dom)
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+
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+ # We should skip all DNS subdomains of our forest
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+ # because we are going to add *.<forest> TLN anyway
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+ if forest.is_superdomain(d) and forest != d:
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+ continue
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+
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+ # We also should skip single label TLDs as they
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+ # cannot be added as TLNs
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+ if len(d.labels) == 1:
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+ continue
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+
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ftinfo = dict()
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ftinfo['rec_name'] = dom
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ftinfo['rec_time'] = trust_timestamp
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--
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2.13.6
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