Slot kvno principal
To add a host or service principal to a keytab using MIT Kerberos. slot KVNO Principal. Verify keytab files Raw. slot KVNO Principal KVNO Timestamp Principal. Sep 15, · slot KVNO Principal From the error it appears that it is complaining about "Wrong principal in request.
Administering Keytab Files
For this example, the keytab file must be the file that is specified in the kdc. The user can use the same service ticket for accessing other AIX client systems without having to re-enter the password. Additionaly data integrity is provided. Save the current keytab file to a temporary file. COM We can secure mount the complete export tree with: To enable the host service back on denver , you would copy the krb5. For example, you might want to stop users from logging in to a system while you are performing maintenance procedures.
Add a host or service principal to a keytab using MIT Kerberos
Given one of these keys it is possible to obtain a ticket-granting ticket, so having an encryption key can be equated to having a password.
Whenever a host or service principal is created it is normal practice to add it to a keytab. The host principal should be added to this keytab, but it is not necessarily suitable for use with service principals.
The only secure solution to this issue is to have multiple keytabs, each owned by the user that needs access to it. Suppose you wish to allow authentication to the web site http: COM for this purpose, and now need to add it to a keytab. The web site is served using Apache running as the user www-data.
It is not necessary for the keytab file to exist beforehand because it will be created if necessary. A host or service principal can be added to a new or existing keytab using the ktadd command of kadmin:.
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Documentation for other versions is available at Cloudera Documentation. A Kerberos principal is used in a Kerberos-secured system to represent a unique identity. Kerberos assigns tickets to Kerberos principals to enable them to access Kerberos-secured Hadoop services. COM principal refers to the username of an existing Unix account, such as hdfs or mapred.
A keytab is a file containing pairs of Kerberos principals and an encrypted copy of that principal's key. The keytab files are unique to each host since their keys include the hostname. This file is used to authenticate a principal on a host to Kerberos without human interaction or storing a password in a plain text file. Because having access to the keytab file for a principal allows one to act as that principal, access to the keytab files should be tightly secured.
They should be readable by a minimal set of users, should be stored on local disk, and should not be included in machine backups, unless access to those backups is as secure as access to the local machine. On every machine in your cluster , there must be a keytab file for the hdfs user and a keytab file for the mapred user. The hdfs keytab file must contain entries for the hdfs principal and a HTTP principal, and the mapred keytab file must contain entries for the mapred principal and a HTTP principal.
On each respective machine, the HTTP principal will be the same in both keytab files. In addition, for YARN deployments only: On every machine in your cluster , there must be a keytab file for the yarn user. The yarn keytab file must contain entries for the yarn principal and a HTTP principal. The following instructions illustrate an example of creating keytab files for MIT Kerberos.
If you are using another version of Kerberos, refer to your Kerberos documentation for instructions. You may use either kadmin or kadmin. When creating the Kerberos principals and keytabs, you can use kadmin. In this guide, kadmin is shown as the prompt for commands in the kadmin shell, but you can type the same commands at the kadmin. You should provide your Unix password. Running kadmin may prompt you for a password because you need Kerberos admin privileges.
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