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https://issues.apache.org/jira/browse/HADOOP-13119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15635132#comment-15635132
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Yuanbo Liu commented on HADOOP-13119:
-------------------------------------
[~jeffreyr97]/[~eyang]
I've read through the implements of {{HttpServer2.java}} and some filters, here
is my investigation result.
!screenshot-1.png!
>From the picture, we can see that /logs access is also controlled by SPENGO
>filter(the authentication in the filter chain is a SPENGO filter).
{{HttpServer2#initSpnego}} is confusing because this method is not working and
also is not the way SPENGO filter is added. The right steps of enabling SPENGO
are here:
{code}
hadoop.http.authentication.simple.anonymous.allowed false
hadoop.http.authentication.signature.secret.file /etc/security/http_secret
hadoop.http.authentication.type kerberos
hadoop.http.authentication.kerberos.keytab
/etc/security/keytabs/spnego.service.keytab
hadoop.http.authentication.kerberos.principal HTTP/_h...@example.com
hadoop.http.filter.initializers
org.apache.hadoop.security.AuthenticationFilterInitializer
hadoop.http.authentication.cookie.domain EXAMPLE.COM
{code}
The SPENGO filter is added by the method {{HttpServer2#addFilter}}.
[~jeffreyr97] The reason why you cannot access {{/logs}} is that {{/logs}}
doesn't only require authentication but also require authorization by default.
And authorization is controlled by the the property
*dfs.cluster.administrators*. The user knox succeeds in authentication but
fails in authorization. Adding the user knox to dfs.cluster.administrators is
an expected behavior because this configuration is used to control who can
access the default servlets.
On the other hand, I love the idea that make SPENGO filter support proxy user.
Proxy user is a basic function in Hadoop, and SPENGO filter should support it.
By the way, I need to apologize that I mix the concepts of proxy user and
delegation filter in the internal discussion, they're quite different.
To the conclusion, I propose:
* Erasing {{HttpServer2#initSpnego}}. The code is useless and misleading.
* Extending the feature of {{org.apache.hadoop.security.AuthenticationFilter}}
and making SPENGO filter support proxy user by default.
[~zjshen]/[~atm]/[~daryn]/[~vinodkv], I tag you guys here since you contribute
a lot of security filters in Hadoop.
If you and people in the watching list have any thoughts about this JIRA,
please let me know. Thanks in advance.
> Web UI error accessing links which need authorization when Kerberos
> -------------------------------------------------------------------
>
> Key: HADOOP-13119
> URL: https://issues.apache.org/jira/browse/HADOOP-13119
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 2.8.0, 2.7.4
> Reporter: Jeffrey E Rodriguez
> Assignee: Yuanbo Liu
> Labels: security
> Attachments: screenshot-1.png
>
>
> User Hadoop on secure mode.
> login as kdc user, kinit.
> start firefox and enable Kerberos
> access http://localhost:50070/logs/
> Get 403 authorization errors.
> only hdfs user could access logs.
> Would expect as a user to be able to web interface logs link.
> Same results if using curl:
> curl -v --negotiate -u tester: http://localhost:50070/logs/
> HTTP/1.1 403 User tester is unauthorized to access this page.
> so:
> 1. either don't show links if hdfs user is able to access.
> 2. provide mechanism to add users to web application realm.
> 3. note that we are pass authentication so the issue is authorization to
> /logs/
> suspect that /logs/ path is secure in webdescriptor so suspect users by
> default don't have access to secure paths.
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