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From "Wei-Chiu Chuang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12862) LDAP Group Mapping over SSL can not specify trust store
Date Tue, 22 Aug 2017 04:23:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16136258#comment-16136258
] 

Wei-Chiu Chuang commented on HADOOP-12862:
------------------------------------------

Hello, trying to bump up this patch.
I have tested the last patch against Cloudera's latest CDH version. Our internal LDAP server
is self signed so Hadoop needs to specify a trust store.

Without this patch, LdapGroupsMapping fails with SSLHandshakeException error.

{quote}
2017-08-21 21:07:51,517 WARN org.apache.hadoop.security.LdapGroupsMapping: Failed to get groups
for user mapred (retry=2) by javax.naming.CommunicationException
: simple bind failed: scale-ad.ad.halxg.cloudera.com:636 [Root exception is javax.net.ssl.SSLHandshakeException:
sun.security.validator.ValidatorException: PKIX
 path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable
to find valid certification path to requested target]
{quote}

After applying the patch, groups mapping works successfully.

> LDAP Group Mapping over SSL can not specify trust store
> -------------------------------------------------------
>
>                 Key: HADOOP-12862
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12862
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Wei-Chiu Chuang
>            Assignee: Wei-Chiu Chuang
>         Attachments: HADOOP-12862.001.patch, HADOOP-12862.002.patch, HADOOP-12862.003.patch,
HADOOP-12862.004.patch, HADOOP-12862.005.patch, HADOOP-12862.006.patch, HADOOP-12862.007.patch
>
>
> In a secure environment, SSL is used to encrypt LDAP request for group mapping resolution.
> We (+[~yoderme], +[~tgrayson]) have found that its implementation is strange.
> For information, Hadoop name node, as an LDAP client, talks to a LDAP server to resolve
the group mapping of a user. In the case of LDAP over SSL, a typical scenario is to establish
one-way authentication (the client verifies the server's certificate is real) by storing the
server's certificate in the client's truststore.
> A rarer scenario is to establish two-way authentication: in addition to store truststore
for the client to verify the server, the server also verifies the client's certificate is
real, and the client stores its own certificate in its keystore.
> However, the current implementation for LDAP over SSL does not seem to be correct in
that it only configures keystore but no truststore (so LDAP server can verify Hadoop's certificate,
but Hadoop may not be able to verify LDAP server's certificate)
> I think there should an extra pair of properties to specify the truststore/password for
LDAP server, and use that to configure system properties {{javax.net.ssl.trustStore}}/{{javax.net.ssl.trustStorePassword}}
> I am a security layman so my words can be imprecise. But I hope this makes sense.
> Oracle's SSL LDAP documentation: http://docs.oracle.com/javase/jndi/tutorial/ldap/security/ssl.html
> JSSE reference guide: http://docs.oracle.com/javase/7/docs/technotes/guides/security/jsse/JSSERefGuide.html



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