Can we use password and Keytab file for same user in Kerberos?

[#1]

Can we use password and Keytab file for same user in Kerberos? Also, is password changed after creating keytab for that principal?

[#2 · Accepted solution]

@Bhushan Kandalkar, Yes we can use both password and keytab for the same principal. You will have to regenerate the keytab if you change the password.

[#3]

@Sandeep Nemuri,

I am getting error while using password for same principal. I have done following steps:

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kadmin: addprinc [email protected]

WARNING: no policy specified for [email protected]; defaulting to no policy Enter password for principal "[email protected]":

Re-enter password for principal "[email protected]":

Principal "[email protected]" created.

kadmin: ktadd -k /home/testuser/testuser.keytab [email protected]

Entry for principal [email protected] with kvno 2, encryption type aes256-cts-hmac-sha1-96 added to keytab WRFILE:/home/testuser/testuser.keytab. Entry for principal [email protected] with kvno 2, encryption type aes128-cts-hmac-sha1-96 added to keytab WRFILE:/home/testuser/testuser.keytab. kadmin: quit

[root@bhushanhdp-1 ~]# chown -R testuser:testuser /home/testuser/testuser.keytab

[root@bhushanhdp-1 ~]# chmod 600 /home/testuser/testuser.keytab

[root@bhushanhdp-1 ~]# su - testuser

[testuser@bhushanhdp-1 ~]$ kinit -kt testuser.keytab [email protected]

[testuser@bhushanhdp-1 ~]$ hadoop fs -ls /

Found 9 items

drwxrwxrwx - yarn hadoop 0 2018-01-29 11:39 /app-logs

drwxr-xr-x - hdfs hdfs 0 2018-01-29 11:39 /apps

drwxr-xr-x - yarn hadoop 0 2018-01-29 11:37 /ats

drwxr-xr-x - hdfs hdfs 0 2018-01-29 11:37 /hdp

drwxr-xr-x - mapred hdfs 0 2018-01-29 11:37 /mapred

drwxrwxrwx - mapred hadoop 0 2018-01-29 11:38 /mr-history

drwxrwxrwx - hdfs hdfs 0 2018-01-31 09:27 /tmp

drwxr-xr-x - hdfs hdfs 0 2018-01-29 11:39 /user

drwxr-xr-x - hdfs hdfs 0 2018-01-29 11:37 /webhdfs

[testuser@bhushanhdp-1 ~]$ kdestroy

[testuser@bhushanhdp-1 ~]$ klist klist: No credentials cache found (filename: /tmp/krb5cc_1015)

[testuser@bhushanhdp-1 ~]$ kinit [email protected]

Password for [email protected]:

kinit: Password incorrect while getting initial credentials

[testuser@bhushanhdp-1 ~]$

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Is password changed after creating Keytab file?

How should I used both password and Keytab for same principal?

[#4]

@Bhushan Kandalkar use below (which will not change the password while generating the keytab.

kadmin.local -q "xst -norandkey -k testuser.keytab testuser"

[#5]

Thanks @Sandeep Nemuri.