What is Kinit used for?

kinit is used to obtain and cache Kerberos ticket-granting tickets. This tool is similar in functionality to the kinit tool that are commonly found in other Kerberos implementations, such as SEAM and MIT Reference implementations.

What happens during Kinit?

Description. The kinit command obtains or renews a Kerberos ticket-granting ticket. The Key Distribution Center (KDC) options specified by the [kdcdefault] and [realms] in the Kerberos configuration file (kdc. conf) are used if you do not specify a ticket flag on the command line.

What is Kinit and Keytab?

A keytab is just means for storing the secret key in a local file. So when you kinit using a keytab, it uses the key in the keytab to decrypt the blob. As far as the kerberos protocol is concerned there really is no difference between using a keytab to kinit and using a password.

What is Kerberos in UNIX?

Introduction. Kerberos V5 is an authentication system developed at MIT. Since Kerberos negotiates authenticated, and optionally encrypted, communications between two points anywhere on the internet, it provides a layer of security that is not dependent on which side of a firewall either client is on.

What does Kinit do in Linux?

The kinit command is used to obtain and cache an initial ticket-granting ticket (credential) for principal. This ticket is used for authentication by the Kerberos system. Notice that only users with Kerberos principals can use the Kerberos system.

What is Kinit command in Hadoop?

The kinit program asks the user for their password. This is used to authenticate the user with the Authentication Service of the KDC configured in /etc/krb5. conf . The Kerberos Authentication Service authenticates the user and issues a TGT ticket, which is stored in the client’s Credentials Cache.

What is Kinit and Klist?

DESCRIPTION. klist displays the entries in the local credentials cache and key table. After the user has modified the credentials cache with kinit or modified the keytab with ktab , the only way to verify the changes is to view the contents of the credentials cache and/or keytab using klist .

What is Kinit command?

DESCRIPTION. The kinit command is used to obtain and cache an initial ticket-granting ticket (credential) for principal. This ticket is used for authentication by the Kerberos system.

Why Kerberos is needed?

Kerberos has two purposes: security and authentication. In addition, it is necessary to provide a means of authenticating users: any time a user requests a service, such as mail, they must prove their identity. This is done with Kerberos, and this is why you get your mail and no one else’s.

What is a Keytab?

Every host that provides a service must have a local file, called a keytab (short for key table). The keytab contains the principal for the appropriate service, called a service key. A service key is used by a service to authenticate itself to the KDC and is known only by Kerberos and the service itself.

How is Kerberos used?

The latter functions as the trusted third-party authentication service. Users, machines, and services that use Kerberos depend on the KDC alone, which works as a single process that provides two functions: authentication and ticket-granting.

Is Kerberos a firewall?

Kerberos is primarily a UDP protocol, although it falls back to TCP for large Kerberos tickets. This may require special configuration on firewalls to allow the UDP response from the Kerberos server (KDC). Kerberos clients need to send UDP and TCP packets on port 88 and receive replies from the Kerberos servers.