SSSD Service cannot start: Someone deleted /etc/sssd/sssd.conf and /etc/krb5.keytab from RHEL 7 server

Subject: SSSD Service cannot start: Someone deleted /etc/sssd/sssd.conf and /etc/krb5.keytab from RHEL 7 server


Good day from Singapore,


Today 22 Jun 2022 Wednesday, I discovered that someone deleted /etc/sssd/sssd.conf and /etc/krb5.keytab from one of the Red Hat Enterprise Linux (RHEL) 7 servers. Hence System Security Services Daemon (SSSD) cannot start.


I have solved it by copying /etc/sssd/sssd.conf from another RHEL 7 server and generating kerberos keytab file on the Active Directory Domain Controller Windows Server.


Here is an edited sample of our /etc/sssd/sssd.conf file.


[sssd]

domains = project.domain.com

config_file_version = 2

services = nss, pam


[domain/project.domain.com]

ad_server = addc01.project.domain.com

ad_domain = project.domain.com

krb5_realm = PROJECT.DOMAIN.COM

realmd_tags = manages-system joined-with-adcli

cache_credentials = True

id_provider = ad

krb5_store_password_if_offline = True

default_shell = /bin/bash

ldap_id_mapping = True

use_fully_qualified_names = True

fallback_homedir = /home/%u%d

access_provider = ad


The 2 Windows Server commands I used to create a kerberos keytab are:


[1] setspn -A host/rhel7.project.domain.com rhel7


[2] ktpass /princ host/rhel7.project.domain.com@PROJECT.DOMAIN.COM /out rhel7.keytab /crypto All /ptype KRB5_NT_PRINCIPAL -desonly /mapuser PROJECT\rhel7$ +setupn +rndPass +setpass +answer


After generating rhel7.keytab on the Active Directory Domain Controller Windows Server, copy the keytab file to the target RHEL 7 server as /etc/krb5.keytab.


As we do not have direct SSH access to the target RHEL 7 server, I have to copy out rhel7.keytab from the Windows Server using winscp. Then I use winscp again to upload rhel7.keytab to another intermediate RHEL 7 server. From the intermediate RHEL 7 server, I used the following Linux command to transfer rhel7.keytab to the target RHEL 7 server.


$ scp rhel7.keytab user@<IP address of target RHEL 7 server>:/home/user/rhel7.keytab


On the target RHEL 7 server, run the following Linux commands:


$ sudo cp rhel7.keytab /etc/krb5.keytab


Then 


$ su -


# systemctl start sssd.service


# systemctl status sssd.service


I have solved the problem!


Reference Guides

================


[1] 22.8.1 Configuring an SSSD Server

Link: https://docs.oracle.com/cd/E37670_01/E41138/html/ch22s08s01.html


[2] How to create a kerberos keytab on Active Directory for Red Hat Enterprise Linux

Link: https://access.redhat.com/solutions/208173


Regards,


Mr. Turritopsis Dohrnii Teo En Ming

Targeted Individual in Singapore

22 Jun 2022 Wednesday

Blogs:

https://tdtemcerts.blogspot.com/

https://tdtemcerts.wordpress.com/





REFERENCES

============


[1] https://lists.fedorahosted.org/archives/list/sssd-users@lists.fedorahosted.org/thread/JMB2IWNLQIMX4NRGUEUYTXYILKC5DR6Q/


[2] https://www.mail-archive.com/sssd-users@lists.fedorahosted.org/msg08162.html


[3] https://marc.info/?l=sssd-users&m=165590714801417&w=2


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