[Users] openldap
Juan Hernandez
jhernand at redhat.com
Mon Nov 18 11:24:25 EST 2013
On 11/18/2013 12:17 PM, Jonas Israelsson wrote:
> On 17/10/13 17:22, Juan Hernandez wrote:
>> On 10/17/2013 05:15 PM, Itamar Heim wrote:
>>> On 10/17/2013 09:57 AM, Jonas Israelsson wrote:
>>>> I saw that openldap is now listed as a provider when invoking
>>>> engine-manage-domains. I'm eager to find more information about this.
>>>> Does anyone know if there is any updated documentation floating around
>>>> somewhere ?
>>>>
>>>> Found this: http://www.ovirt.org/LDAP_Quick_Start
>>>>
>>>> But the article seem only half-finished.
>>>>
>>>> Rgds Jonas
>>>>
>>> this may help you.
>>> https://bugzilla.redhat.com/show_bug.cgi?id=967327#c4
>>> https://bugzilla.redhat.com/show_bug.cgi?id=967327#c5
>>>
>>> help finishing the wiki would be great...
>>>
>>> thanks,
>>> Itamar
>>>
>> I am attaching slightly updated notes on how to configure OpenLDAP and
>> Kerberos for both Fedora and RHEL/CentOS.
>>
I just updated the wiki with the latest version of the instructions that
I use. I think they work. Any enhancement is welcome.
> Anyone knows if ovirt is able to handle that the kdc and directory
> service are running on separate hosts ? In my environment this is the
> case where the kdc is located at a service with it's own name/IP
> (admin.elementary.se), and the directory-service on ldap.elementary.se.
> Even though I see both names are resolved by a name server lookup a
> network sniffer trace shows that later (ldap.elementary.se) used for
> both kerberos and ldap access.
>
By default oVirt uses the Kerberos and LDAP servers that are provided by
DNS. Can you please check what is the result of the following DNS query?
# dig -t SRV _kerberos._tcp.elementary.se
> Furthermore this (incorrect) configuration file is created
>
> [libdefaults]
>
> default_realm = ELEMENTARY.SE
> dns_lookup_realm = false
> dns_lookup_kdc = false
> ticket_lifetime = 24h
> renew_lifetime = 7d
> forwardable = no
> default_tkt_enctypes = arcfour-hmac-md5
> udp_preference_limit = 1
>
> [realms]
> ELEMENTARY.SE = {
> kdc = ldap.elementary.se
> }
>
>
> [domain_realm]
> elementary.se = ELEMENTARY.SE
>
>
> In my lab both these services are actually placed on the same physical
> server and since the kdc binds to all local interfaces ovirt actually
> does reach the kdc via the incorrect name, this is however not the case
> later in production.
>
This file is generated from the above mentioned DNS queries. Please let
us know what is the content of your SRV DNS records.
> When trying to add the domain it crashes with the following stack trace
>
> General error has occurednull
> java.lang.NegativeArraySizeException
> at
> sun.security.jgss.krb5.CipherHelper.aes256Encrypt(CipherHelper.java:1367)
> at
> sun.security.jgss.krb5.CipherHelper.encryptData(CipherHelper.java:722)
> at sun.security.jgss.krb5.WrapToken_v2.<init>(WrapToken_v2.java:200)
> at sun.security.jgss.krb5.Krb5Context.wrap(Krb5Context.java:861)
> at sun.security.jgss.GSSContextImpl.wrap(GSSContextImpl.java:385)
> at
> com.sun.security.sasl.gsskerb.GssKrb5Base.wrap(GssKrb5Base.java:104)
> at
> com.sun.jndi.ldap.sasl.SaslOutputStream.write(SaslOutputStream.java:89)
> at com.sun.jndi.ldap.Connection.writeRequest(Connection.java:430)
> at com.sun.jndi.ldap.LdapClient.search(LdapClient.java:555)
> at com.sun.jndi.ldap.LdapCtx.doSearch(LdapCtx.java:1985)
> at com.sun.jndi.ldap.LdapCtx.searchAux(LdapCtx.java:1847)
> at com.sun.jndi.ldap.LdapCtx.c_search(LdapCtx.java:1772)
> at
> com.sun.jndi.toolkit.ctx.ComponentDirContext.p_search(ComponentDirContext.java:386)
> at
> com.sun.jndi.toolkit.ctx.PartialCompositeDirContext.search(PartialCompositeDirContext.java:356)
> at
> com.sun.jndi.toolkit.ctx.PartialCompositeDirContext.search(PartialCompositeDirContext.java:339)
> at
> javax.naming.directory.InitialDirContext.search(InitialDirContext.java:267)
> at
> org.ovirt.engine.core.ldap.RootDSEData.<init>(RootDSEData.java:52)
> at
> org.ovirt.engine.core.utils.kerberos.JndiAction.getDomainDN(JndiAction.java:257)
> at
> org.ovirt.engine.core.utils.kerberos.JndiAction.run(JndiAction.java:87)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:356)
> at
> org.ovirt.engine.core.utils.kerberos.KerberosConfigCheck.promptSuccessfulAuthentication(KerberosConfigCheck.java:174)
> at
> org.ovirt.engine.core.utils.kerberos.KerberosConfigCheck.validateKerberosInstallation(KerberosConfigCheck.java:150)
> at
> org.ovirt.engine.core.utils.kerberos.KerberosConfigCheck.checkInstallation(KerberosConfigCheck.java:135)
> at
> org.ovirt.engine.core.domains.ManageDomains.checkKerberosConfiguration(ManageDomains.java:746)
> at
> org.ovirt.engine.core.domains.ManageDomains.testConfiguration(ManageDomains.java:917)
> at
> org.ovirt.engine.core.domains.ManageDomains.addDomain(ManageDomains.java:539)
> at
> org.ovirt.engine.core.domains.ManageDomains.runCommand(ManageDomains.java:311)
> at
> org.ovirt.engine.core.domains.ManageDomains.main(ManageDomains.java:206)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at org.jboss.modules.Module.run(Module.java:260)
> at org.jboss.modules.Main.main(Main.java:291)
> Failure while testing domain %1$s. Details: %2$s: One of the parameters
> for this error is null and no default message to show
>
> And this gets written to the log
>
> 2013-11-18 10:22:12,479 INFO
> [org.ovirt.engine.core.domains.ManageDomains] Creating kerberos
> configuration for domain(s): elementary.se
> 2013-11-18 10:22:12,493 INFO
> [org.ovirt.engine.core.domains.ManageDomains] Successfully created
> kerberos configuration for domain(s): elementary.se
> 2013-11-18 10:22:12,493 INFO
> [org.ovirt.engine.core.domains.ManageDomains] Testing kerberos
> configuration for domain: elementary.se
> 2013-11-18 10:22:12,569 ERROR
> [org.ovirt.engine.core.utils.kerberos.KerberosConfigCheck] Error:
> exception message: Checksum failed
> 2013-11-18 10:22:12,571 ERROR
> [org.ovirt.engine.core.domains.ManageDomains] Failure while testing
> domain elementary.se. Details: Kerberos error. Please check log for
> further details.
>
> Could this checksum error be a result of the incorrect name being used ?
>
I don't think so. This is a known problem with the Kerberos
implementation in the Java virtual machine. It generates this error when
the SASL minssf configuration parameter is 0. You should be able to
change this OpenLDAP setting as follows:
# cat > fixssf.ldif <<'.'
dn: cn=config
replace: olcSaslSecProps
olcSaslSecProps: noanonymous,noplain,minssf=1
-
.
# ldapmodify -H ldapi:/// -Y EXTERNAL -f fixssf.ldif
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