kpasswd fails when using sssd and kadmin server != kdc server

[sssd-bot]

Cloned from Pagure issue: https://pagure.io/SSSD/sssd/issue/1023

• Created at 2011-09-30 14:53:17 by sgallagh
• Closed as Fixed
• Assigned to nobody
• Associated bugzillas
  • https://bugzilla.redhat.com/show_bug.cgi?id=698724

---

https://bugzilla.redhat.com/show_bug.cgi?id=698724

+++ This bug was initially created as a clone of Bug #697057 +++

Description of problem:
kpasswd fails with the error: "kpasswd: Cannot contact any KDC for requested realm changing password" if sssd is used with krb backend and the kadmin service is not running on the KDCs.

Version-Release number of selected component (if applicable):
sssd-1.5.4-1.fc14
krb5-workstation-1.8.2-9.fc14

How reproducible:
Almost every time, predictable.

Steps to Reproduce:
1. System with sssd using krb5 as auth backend. kpasswd service on a different server to the KDC
2. Run 'kpasswd' as a user
3. Enter passwords
  
Actual results:
"kpasswd: Cannot contact any KDC for requested realm changing password"

Expected results:
kpasswd sends a change password request to the kadmin server.

Additional info:
kpasswd is looking for /var/lib/sss/pubconf/kdcinfo.$REALM, if not found it falls back to the traditional method of using /etc/krb5.conf and then DNS lookup. Which works.

If kdcinfo.$REALM exists, kpasswd then looks for /var/lib/sss/pubconf/kpasswdinfo.$REALM, which never gets created. kpasswd uses the addresses from kdcinfo.$REALM as the kadmin server, which isn't running the kpasswd service. Hence fail.

The file in /var/lib/sss/pubconf/ is only created after sssd-krb5 is poked in the right way, e.g. an auth attempt. After restarting sssd the directory is empty.

/etc/sssd/sssd.conf contains:
[sssd]
config_file_version = 2
reconnection_retries = 3
sbus_timeout = 30
services = nss, pam
domains = default
[nss]
filter_groups = root
filter_users = root
reconnection_retries = 3
[pam]
reconnection_retries = 3
[domain/default]
cache_credentials = True
debug_level = 0
id_provider = ldap
ldap_uri = ldaps://ldap-auth.mydomain
ldap_id_use_start_tls = False
ldap_search_base = dc=decisionsoft,dc=com
chpass_provider = krb5
auth_provider = krb5
krb5_realm = MYREALM
krb5_kpasswd = kerberos-master.mydomain
krb5_server = kerberos.mydomain

Comments

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Comment from sgallagh at 2011-09-30 14:54:00

Fixed by 5e88215

coverity: =>
description: https://bugzilla.redhat.com/show_bug.cgi?id=698724

{{{
+++ This bug was initially created as a clone of Bug #697057 +++

Description of problem:
kpasswd fails with the error: "kpasswd: Cannot contact any KDC for requested realm changing password" if sssd is used with krb backend and the kadmin service is not running on the KDCs.

Version-Release number of selected component (if applicable):
sssd-1.5.4-1.fc14
krb5-workstation-1.8.2-9.fc14

How reproducible:
Almost every time, predictable.

Steps to Reproduce:

1. System with sssd using krb5 as auth backend. kpasswd service on a different server to the KDC
2. Run 'kpasswd' as a user
3. Enter passwords

Actual results:
"kpasswd: Cannot contact any KDC for requested realm changing password"

Expected results:
kpasswd sends a change password request to the kadmin server.

Additional info:
kpasswd is looking for /var/lib/sss/pubconf/kdcinfo.$REALM, if not found it falls back to the traditional method of using /etc/krb5.conf and then DNS lookup. Which works.

If kdcinfo.$REALM exists, kpasswd then looks for /var/lib/sss/pubconf/kpasswdinfo.$REALM, which never gets created. kpasswd uses the addresses from kdcinfo.$REALM as the kadmin server, which isn't running the kpasswd service. Hence fail.

The file in /var/lib/sss/pubconf/ is only created after sssd-krb5 is poked in the right way, e.g. an auth attempt. After restarting sssd the directory is empty.

/etc/sssd/sssd.conf contains:
[sssd]
config_file_version = 2
reconnection_retries = 3
sbus_timeout = 30
services = nss, pam
domains = default
[nss]
filter_groups = root
filter_users = root
reconnection_retries = 3
[pam]
reconnection_retries = 3
[domain/default]
cache_credentials = True
debug_level = 0
id_provider = ldap
ldap_uri = ldaps://ldap-auth.mydomain
ldap_id_use_start_tls = False
ldap_search_base = dc=decisionsoft,dc=com
chpass_provider = krb5
auth_provider = krb5
krb5_realm = MYREALM
krb5_kpasswd = kerberos-master.mydomain
krb5_server = kerberos.mydomain
}}}
=> https://bugzilla.redhat.com/show_bug.cgi?id=698724

{{{
+++ This bug was initially created as a clone of Bug #697057 +++

Description of problem:
kpasswd fails with the error: "kpasswd: Cannot contact any KDC for requested realm changing password" if sssd is used with krb backend and the kadmin service is not running on the KDCs.

Version-Release number of selected component (if applicable):
sssd-1.5.4-1.fc14
krb5-workstation-1.8.2-9.fc14

How reproducible:
Almost every time, predictable.

Steps to Reproduce:

1. System with sssd using krb5 as auth backend. kpasswd service on a different server to the KDC
2. Run 'kpasswd' as a user
3. Enter passwords

Actual results:
"kpasswd: Cannot contact any KDC for requested realm changing password"

Expected results:
kpasswd sends a change password request to the kadmin server.

Additional info:
kpasswd is looking for /var/lib/sss/pubconf/kdcinfo.$REALM, if not found it falls back to the traditional method of using /etc/krb5.conf and then DNS lookup. Which works.

If kdcinfo.$REALM exists, kpasswd then looks for /var/lib/sss/pubconf/kpasswdinfo.$REALM, which never gets created. kpasswd uses the addresses from kdcinfo.$REALM as the kadmin server, which isn't running the kpasswd service. Hence fail.

The file in /var/lib/sss/pubconf/ is only created after sssd-krb5 is poked in the right way, e.g. an auth attempt. After restarting sssd the directory is empty.

/etc/sssd/sssd.conf contains:
[sssd]
config_file_version = 2
reconnection_retries = 3
sbus_timeout = 30
services = nss, pam
domains = default
[nss]
filter_groups = root
filter_users = root
reconnection_retries = 3
[pam]
reconnection_retries = 3
[domain/default]
cache_credentials = True
debug_level = 0
id_provider = ldap
ldap_uri = ldaps://ldap-auth.mydomain
ldap_id_use_start_tls = False
ldap_search_base = dc=decisionsoft,dc=com
chpass_provider = krb5
auth_provider = krb5
krb5_realm = MYREALM
krb5_kpasswd = kerberos-master.mydomain
krb5_server = kerberos.mydomain
}}}

patch: => 1
resolution: => fixed
rhbz: =>
status: new => closed
tests: => 0
testsupdated: => 0
upgrade: => 0

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Comment from mkosek at 2011-12-16 16:03:01

Fields changed

rhbz: => [https://bugzilla.redhat.com/show_bug.cgi?id=698724 698724]

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Comment from sgallagh at 2017-02-24 15:03:23

Metadata Update from @sgallagh:

• Issue set to the milestone: SSSD 1.5.9