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From dyozie <...@git.apache.org>
Subject [GitHub] incubator-hawq-docs pull request #132: add support for active directory KDC ...
Date Thu, 26 Oct 2017 19:21:32 GMT
Github user dyozie commented on a diff in the pull request:

    https://github.com/apache/incubator-hawq-docs/pull/132#discussion_r147239062
  
    --- Diff: markdown/clientaccess/kerberos-userauth.html.md.erb ---
    @@ -0,0 +1,459 @@
    +---
    +title: Configuring Kerberos User Authentication for HAWQ
    +---
    +
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    +
    +When Kerberos authentication is enabled at the user level, HAWQ uses the Generic Security
Service Application Program Interface \(GSSAPI\) to provide automatic authentication \(single
sign-on\). When HAWQ uses Kerberos user authentication, HAWQ itself and the HAWQ users \(roles\)
that require Kerberos authentication require a principal and keytab. When a user attempts
to log in to HAWQ, HAWQ uses its Kerberos principal to connect to the Kerberos server, and
presents the user's principal for Kerberos validation. If the user principal is valid, login
succeeds and the user can access HAWQ. Conversely, the login fails and HAWQ denies access
to the user if the principal is not valid.
    +
    +When HAWQ utilizes Kerberos for user authentication, it uses a standard principal to
connect to the Kerberos KDC. The format of this principal is `postgres/<FQDN_of_master>@<realm>`,
where \<FQDN\_of\_master\> refers to the fully qualified distinguish name of the HAWQ
master node.
    +
    +(You may choose to configure HAWQ user principals before you enable Kerberos user authentication
for HAWQ. See [Configuring Kerberos-Authenticated HAWQ Users](#hawq_kerb_user_cfg).)
    +
    +The procedure to configure Kerberos user authentication for HAWQ includes:
    +
    +If you use an MIT Kerberos KDC Server:  
    +**Step 1a**: [Configuring the HAWQ Principals using an MIT KDC Server](#hawq_kerb_cfg_mitkdc)
 
    +
    +If you use an Active Directory Kerberos KDC Server:  
    +**Step 1b**: [Configuring the HAWQ Principal using an AD KDC Server](#hawq_kerb_cfg_adkdc)
 
    +
    +**Step 2**: [Configuring HAWQ to use Kerberos Authentication](#hawq_kerb_cfg)  
    +**Step 3**: [Configuring Kerberos-Authenticated HAWQ Users](#hawq_kerb_user_cfg)  
    +**Step 4**: [Authenticating User Access to HAWQ](#hawq_kerb_dbaccess)  
    +
    +## <a id="hawq_kerb_cfg_mitkdc"></a>Step 1a: Configuring the HAWQ Principals
using an MIT KDC Server
    +
    +Perform the following procedure to configure HAWQ Kerberos and `gpadmin` principals when
you are using an MIT KDC server. 
    +
    +**Note**: Some operations may differ based on whether or not you have configured secure
HDFS. These operations are called out below.
    +
    +1. Log in to the Kerberos KDC server system:
    +
    +    ``` shell
    +    $ ssh root@<kdc-server>
    +    root@kdc-server$ 
    +    ```
    +
    +2. Create a keytab entry for the HAWQ `postgres/<master>` principal using the `kadmin.local`
command. Substitute the HAWQ master node fully qualified distinguished hostname and your Kerberos
realm. For example:
    --- End diff --
    
    "Create a keytab entry for the HAWQ **server**"


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