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adtrust upgrade: fix wrong primary principal name

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Upgrade code had Kerberos principal names mixed up: instead of creating
krbtgt/LOCAL-FLAT@REMOTE and marking LOCAL-FLAT$@REMOTE as an alias to
it, it created LOCAL-FLAT$@REMOTE Kerberos principal and marked
krbtgt/LOCAL-FLAT@REMOTE as an alias.

This differs from what Active Directory expects and what is created by
ipasam plugin when trust is established. When upgrading such deployment,
an upgrade code then unexpectedly failed.

Resolves: https://pagure.io/freeipa/issue/7992
Reviewed-By: Rob Crittenden <rcritten@redhat.com>
This commit is contained in:
Alexander Bokovoy
2019-06-25 15:22:57 +03:00
committed by Christian Heimes
parent 0294ad2133
commit 34bfffd1be
3 changed files with 18 additions and 14 deletions
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12
daemons/ipa-sam/ipa_sam.c
View File

@@ -2039,11 +2039,13 @@ static bool handle_cross_realm_princs(struct ipasam_private *ipasam_state,
pwd_outgoing, trusted_dn,
KRB_PRINC_CREATE_DEFAULT);
/* Second: <OUR FLATNAME$>@<REMOTE REALM> is only used
* for SSSD to be able to talk to AD DCs but it has to
* have canonical name set to <OUR FLATNAME>$ because
* this is the salt used by AD DCs when using this
* principal, otherwise authentication will fail.
/* Second: krbtgt/<OUR FLATNAME>@<REMOTE REALM>
* is only used for SSSD to be able to talk to
* AD DCs but it has to have canonical name set
* to krbtgt/<OUR FLATNAME> and alias it to
* <OUR FLATNAME$> because it is the salt used
* by AD DCs when using this principal,
* otherwise authentication will fail.
*
* *disable* use of this principal on our side as it is
* only used to retrieve trusted domain credentials by

16
doc/designs/adtrust/oneway-trust-with-shared-secret.md
View File

@@ -131,16 +131,18 @@ and `LOCAL-FLAT` is the NetBIOS name of the FreeIPA primary domain (e.g.
REMOTE-FLAT$@LOCAL | Trusted domain object account for the Active Directory forest root domain
krbtgt/REMOTE-FLAT@LOCAL | Alias to REMOTE-FLAT$ TDO
krbtgt/LOCAL@REMOTE | Cross-realm principal representing IPA domain in Active Directory forest to allow crross-realm TGT issuance from IPA KDC side
LOCAL-FLAT$@REMOTE | Trusted domain object account for IPA domain in Active Directory forest
krbtgt/LOCAL-FLAT@REMOTE | Alias to LOCAL-FLAT$
krbtgt/LOCAL-FLAT@REMOTE | Trusted domain object account for IPA domain in Active Directory forest
LOCAL-FLAT$@REMOTE | Alias to krbtgt/LOCAL-FLAT@REMOTE
For inbound trust `ipasam` module creates following principals:
* `krbtgt/LOCAL@REMOTE`, enabled by default
* `LOCAL-FLAT$@REMOTE`, used by SSSD to talk to Active Directory domain
controllers, with canonical name set to `LOCAL-FLAT$` because Kerberos KDC
must use this salt when issuing tickets for this principal. The use of this
principal is disabled on IPA side (IPA KDC does not issue tickets in this name)
--- we only retrieve a keytab for the principal in SSSD.
* `krbtgt/LOCAL-FLAT@REMOTE`, used by SSSD to talk to Active Directory domain
controllers, with canonical name set to `krbtgt/LOCAL-FLAT@REMOTE` because
Kerberos KDC must use this salt when issuing tickets for this principal. The
use of this principal is disabled on IPA side (IPA KDC does not issue tickets
in this name) --- we only retrieve a keytab for the principal in SSSD. SSSD
retrieves a keytab for this principal using `LOCAL-FLAT$@REMOTE` Principal
name.
For outbound trust `ipasam` module creates following principals:
* `krbtgt/REMOTE@LOCAL`, enabled by default.

4
ipaserver/install/plugins/adtrust.py
View File

@@ -679,12 +679,12 @@ class update_tdo_to_new_layout(Updater):
trust_principal, t_realm)
continue
# 4. Create <OUR FLATNAME$>@<REMOTE REALM>, disabled
# 4. Create krbtgt/<OUR FLATNAME>@<REMOTE REALM>, disabled
nbt_principal = self.nbt_principal_template.format(
nbt=our_nbt_name, realm=t_realm)
tgt_principal = self.tgt_principal_template.format(
remote=our_nbt_name, local=t_realm)
self.set_krb_principal([nbt_principal, tgt_principal],
self.set_krb_principal([tgt_principal, nbt_principal],
passwd_incoming,
t_dn,
flags=self.KRB_PRINC_CREATE_DEFAULT |