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From "Benoy Antony (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12082) Support multiple authentication schemes via AuthenticationFilter
Date Wed, 23 Mar 2016 23:44:25 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12082?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15209437#comment-15209437
] 

Benoy Antony commented on HADOOP-12082:
---------------------------------------

Thanks for [~hgadre] for taking care of the comments. 

Here are the comments on the new patch. 

_nits_

# unnecessary change in hadoop-common-project/hadoop-minikdc/src/main/resources/minikdc.ldiff
# Reference to Minikdc in MiniLdap#48
# Does it make sense to move move the ldap related test classes under a new package , say
minildap ?
# It will be great if you could follow the patch file naming pattern .

_recommendations_

# In AuthenticationFIlter,  Instead of doing _instanceof_ on implementation class -  _MultiSchemeAuthenticationHandler_
, does it make sense to  define an interface say,  _ CompositeAuthenticationHandler_ which
extends AuthenticationHandler and check against that interface ?
This will help others also to write their implementations which could contain multiple handlers.

This applies to DelegationTokenAuthenticationFilter  and MultiSchemeDelegationTokenAuthenticationHandler
also.
# Could you please add the documentation for  _MultiSchemeAuthenticationHandler_ especially
its purpose and the how to configure it  ?


> Support multiple authentication schemes via AuthenticationFilter
> ----------------------------------------------------------------
>
>                 Key: HADOOP-12082
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12082
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: security
>    Affects Versions: 2.6.0
>            Reporter: Hrishikesh Gadre
>            Assignee: Hrishikesh Gadre
>         Attachments: hadoop-ldap-auth-v2.patch, hadoop-ldap-auth-v3.patch, hadoop-ldap-auth-v4.patch,
hadoop-ldap-auth-v5.patch, hadoop-ldap-auth-v6.patch, hadoop-ldap.patch, multi-scheme-auth-support-poc.patch
>
>
> The requirement is to support LDAP based authentication scheme via Hadoop AuthenticationFilter.
HADOOP-9054 added a support to plug-in custom authentication scheme (in addition to Kerberos)
via AltKerberosAuthenticationHandler class. But it is based on selecting the authentication
mechanism based on User-Agent HTTP header which does not conform to HTTP protocol semantics.
> As per [RFC-2616|http://www.w3.org/Protocols/rfc2616/rfc2616.html]
> - HTTP protocol provides a simple challenge-response authentication mechanism that can
be used by a server to challenge a client request and by a client to provide the necessary
authentication information. 
> - This mechanism is initiated by server sending the 401 (Authenticate) response with
‘WWW-Authenticate’ header which includes at least one challenge that indicates the authentication
scheme(s) and parameters applicable to the Request-URI. 
> - In case server supports multiple authentication schemes, it may return multiple challenges
with a 401 (Authenticate) response, and each challenge may use a different auth-scheme. 
> - A user agent MUST choose to use the strongest auth-scheme it understands and request
credentials from the user based upon that challenge.
> The existing Hadoop authentication filter implementation supports Kerberos authentication
scheme and uses ‘Negotiate’ as the challenge as part of ‘WWW-Authenticate’ response
header. As per the following documentation, ‘Negotiate’ challenge scheme is only applicable
to Kerberos (and Windows NTLM) authentication schemes.
> [SPNEGO-based Kerberos and NTLM HTTP Authentication|http://tools.ietf.org/html/rfc4559]
> [Understanding HTTP Authentication|https://msdn.microsoft.com/en-us/library/ms789031%28v=vs.110%29.aspx]
> On the other hand for LDAP authentication, typically ‘Basic’ authentication scheme
is used (Note TLS is mandatory with Basic authentication scheme).
> http://httpd.apache.org/docs/trunk/mod/mod_authnz_ldap.html
> Hence for this feature, the idea would be to provide a custom implementation of Hadoop
AuthenticationHandler and Authenticator interfaces which would support both schemes - Kerberos
(via Negotiate auth challenge) and LDAP (via Basic auth challenge). During the authentication
phase, it would send both the challenges and let client pick the appropriate one. If client
responds with an ‘Authorization’ header tagged with ‘Negotiate’ - it will use Kerberos
authentication. If client responds with an ‘Authorization’ header tagged with ‘Basic’
- it will use LDAP authentication.
> Note - some HTTP clients (e.g. curl or Apache Http Java client) need to be configured
to use one scheme over the other e.g.
> - curl tool supports option to use either Kerberos (via --negotiate flag) or username/password
based authentication (via --basic and -u flags). 
> - Apache HttpClient library can be configured to use specific authentication scheme.
> http://hc.apache.org/httpcomponents-client-ga/tutorial/html/authentication.html
> Typically web browsers automatically choose an authentication scheme based on a notion
of “strength” of security. e.g. take a look at the [design of Chrome browser for HTTP
authentication|https://www.chromium.org/developers/design-documents/http-authentication]



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