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The client-side plugin is included in all distributions, including community distributions. This enables clients from any distribution to connect to a server that has the server-side plugin loaded. The following sections provide installation and usage information specific to Kerberos pluggable authentication:.

Prerequisites for Kerberos Pluggable Authentication. Installing Kerberos Pluggable Authentication. Using Kerberos Pluggable Authentication. Kerberos Authentication Debugging. A Kerberos service must be available for the Kerberos authentication plugins to communicate with.

A Kerberos client library must be available on systems where either the server-side or client-side Kerberos authentication plugin is used. Familiarity is assumed here with Kerberos concepts and operation. The following list briefly defines several common Kerberos terms. You may also find the Glossary section of RFC helpful. Principal : A named entity, such as a user or server.

In this discussion, certain principal-related terms occur frequently:. SPN : Service principal name; the name of a principal that represents a service. UPN : User principal name; the name of a principal that represents a user.

AS : The authentication server; provides the initial ticket-granting ticket needed to obtain additional tickets. Kerberos is an instance of a specific security protocol that can be used through that abstract interface. Using GSSAPI, applications authenticate to Kerberos to obtain service credentials, then use those credentials in turn to enable secure access to other services.

This way both the user and the server are able to verify each other's identity. No passwords are sent over the network and Kerberos protocol messages are protected against eavesdropping and replay attacks. The MySQL server sends to the client application its service principal name. The client obtains a ticket-granting ticket from the authentication server. The client optionally may use a client keytab file to obtain a TGT and ST without supplying a password.

The server validates the user identity and the validity of the user request. It authenticates the ST using the service key configured in its service keytab file to determine whether authentication succeeds or fails, and returns the authentication result to the client. Applications are able to authenticate using a provided user name and password, or using a locally cached TGT or ST for example, created using kinit or similar. This design therefore covers use cases ranging from completely userless and passwordless connections, where Kerberos service tickets are obtained from a locally stored Kerberos cache, to connections where both user name and password are provided and used to obtain a valid Kerberos service ticket from a KDC, to send to the MySQL server.

As indicated in the preceding description, MySQL Kerberos authentication uses two kinds of keytab files:. On the client host, a client keytab file may be used to obtain a TGT and ST without supplying a password. This section describes how to install the server-side Kerberos authentication plugin. For general information about installing plugins, see Section 5. The file name suffix differs per platform for example,. To load the plugin at server startup, use the --plugin-load-add option to name the library file that contains it.

With this plugin-loading method, the option must be given each time the server starts. Also, specify values for any plugin-provided system variables you wish to configure. The plugin exposes these system variables, enabling its operation to be configured:. This name is sent to clients that attempt to authenticate using Kerberos. This file must exist and contain a valid key for the SPN or authentication of clients will fail.

For details about all Kerberos authentication system variables, see Section 6. To load the plugin and configure it, put lines such as these in your my. After modifying my. Alternatively, to load the plugin at runtime, use this statement, adjusting the.

After installing the plugin at runtime, the system variables that it exposes become available and you can add settings for them to your my. For example:. To set and persist each value at runtime rather than at startup, use these statements:. It also saves the value, causing it to carry over to subsequent server restarts. See Section If a plugin fails to initialize, check the server error log for diagnostic messages. It is assumed that the server is running with the server-side plugin enabled, as described in Installing Kerberos Pluggable Authentication , and that the client-side plugin is available on the client host.

Verify Kerberos Availability. Client Configuration Parameters for Kerberos Authentication. The following example shows how to test availability of Kerberos in Active Directory. The example makes these assumptions:. Active Directory is running on the host named krbauth. LOCAL as the realm name.

Verify that the Kerberos library is installed and configured correctly in the operating system. Use kinit to authenticate to Kerberos:. Enter the principal's password when the command prompts for it. We have also a sponsorship program for corporates who are willing to spent more money and get some benefits such as a logo placement in return. Welcome to phpMyAdmin 4. File Size Verification phpMyAdmin Your download should start soon, if not please click here.

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