Hrishikesh Gadre commented on HADOOP-12082:

[~benoyantony] The patch is looking good now. Can you please take a look?

> 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-12082-001.patch, HADOOP-12082-002.patch, 
> HADOOP-12082-003.patch, HADOOP-12082-004.patch, HADOOP-12082-005.patch, 
> HADOOP-12082-006.patch, HADOOP-12082.patch, 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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