Professional Level

Troubleshooting authentication issues

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2 hours

2 Learning Objectives

About this Hands-on Lab

In this exercise, you will need to troubleshoot and resolve authentication issues with LDAP, Kerberos, and PAM.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Troubleshoot and resolve Server1.

Resolve login issues for testuser01

Try to log in as testuser01:

ssh testuser01@localhost

View /var/log/secure:

tail /var/log/secure

Attempt to pull the LDAP user information for testuser01:

getent passwd testuser01

Perform an LDAP search:

ldapsearch -x *

View and modify /etc/openldap/ldap.conf:

vim /etc/openldap/ldap.conf

Change:

URI ldap://ldap.example.com/

To:

URI ldap://auth.example.com/

Perform an LDAP search:

ldapsearch -x *

Restart the LDAP naming services daemon:

systemctl restart nslcd

Attempt to pull the LDAP user information for testuser01:

getent passwd testuser01

View /etc/sysconfig/authconfig:

cat /etc/sysconfig/authconfig

Modify authconfig using the TUI interface:

authconfig-tui

Within authconfig-tui:

Verify Use LDAP is checked under User Information
Check Use Kerberos under Authentication
Modify the LDAP server to use auth.example.com
Use auth.example.com for the KDC and Admin Server for Kerberos

Restart the LDAP naming services daemon:

systemctl restart nslcd

Pull the LDAP user information for testuser01:

getent passwd testuser01

ssh testuser01@localhost

Obtain a Kerberos ticket

kinit

List cached Kerberos tickets and logout:

klist && exit

Resolve Samba issues for cloud_user

Verify Samba is started and enabled:

systemctl start smb && systemctl enable smb

Attempt to list the shares using cloud_user:

smbclient -U cloud_user -L localhost

View the Samba log:

tail /var/log/samba/log.smbd

View the Samba PAM config:

cat /etc/pam.d/samba

Verify the Samba package:

rpm -V samba

Move the modified file to /root/samba.pam.old:

mv /etc/pam.d/samba /root/samba.pam.old

Reinstall Samba:

yum reinstall -y samba

List the shares using cloud_user:

smbclient -U cloud_user -L localhost

Troubleshoot and resolve Server2.

Use authconfig-tui to verify and modify LDAP/Kerberos authentication:

authconfig-tui

Verify Use LDAP is checked for both User Information and Authentication
Verify Use Kerberos is checked for Authentication
LDAP server should be auth.example.com
Kerberos KDC and Admin should be auth.example.com

Perform an LDAP search:

ldapsearch -x *

Ping the LDAP server:

ping auth.example.com

Note the IP, view the contents of /etc/hosts:

cat /etc/hosts

Modify /etc/hosts so that auth.example.com points to 10.0.1.5:

vim /etc/hosts

Perform an LDAP search:

ldapsearch -x *

Restart the LDAP naming services daemon:

systemctl restart nslcd

Pull the LDAP user information for testuser01:

getent passwd testuser01

ssh testuser01@localhost

Obtain a Kerberos ticket:

kinit

List Kerberos ticket cache:

klist

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Additional Resources

Environment

Server1: 10.0.1.10

Server2: 10.0.1.11

auth.example.com: 10.0.1.5

LDAP

LDAP host: 10.0.1.5

LDAP Base: dc=example,dc=com

Kerberos

Kerberos KDC: 10.0.1.5

Kerberos Admin: 10.0.1.5

Realm: example.com

Objectives

Username testuser01

Password welcome1

Server1

testuser01 must be able to log into Server1 using Kerberos
testuser01 must be able to obtain a Kerberos ticket
Server1 should not permit LDAP authentication
cloud_user should be able to list the available Samba shares on the localhost

Server2

testuser01 must be able to log into Server1 using LDAP
testuser01 must be able to obtain a Kerberos ticket

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No account setup or cloud bills

Offer applies only to: new personal and business paying customers, existing personal and business customers who switch to an annual paid plan, and any additional annual plan licenses purchased by existing business customers. Offer valid for a limited time only, beginning 10:00AM CT on February 19, 2021. Offer may not be combined with other offers. Purchases are subject to applicable Terms of Use or Master Services Agreement.

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Learn from anywhere with unlimited access to certification courses and deep dives on AWS, Azure, GCP, Linux, and so much more.

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Quickly check your knowledge on a variety of topics and know where to brush up with short quizzes.

ACG Original Series

Keep up with the cloud

Stay up-to-date on all things cloud with weekly and monthly videos about the latest developments in AWS, Azure, GCP, and Kubernetes.

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Get the help you need, when you need it, from industry experts and other learners in the community — and help others in turn.

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Not sure how to proceed? We’ll guide you through the exact skills you need to gain to progress from novice to guru across a variety of cloud specialties, including Architect, Security, and DevOps.

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Learn cloud from anywhere with our mobile apps for iOS and Android.

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Learn off the grid

No internet connection? No problem. Download courses for offline access with our app for iOS and Android.

Unlimited Hands-on Labs

Get your hands cloudy

Learn by doing with guided labs based on real-world scenarios in a secure, risk-free environment. Build new skills in as little as 15 minutes.

Practice Exams

Put your skills to the test

Prepare for your certs with practice exams that mimic the real thing. Plus, get personalized pointers on how to improve your score.

Interactive Diagrams

Study aids on demand

Snag clickable, PDF versions of core concepts to revisit later. Our diagrams make great study aids, help build retention, and can act as handy cheat sheets for a quick refresher down the road.

Video Transcripts & Captions

For the record

Read along when sound isn’t an option and skip furiously scribbling notes. Our transcripts and captions are also fully searchable, making it easy to find exactly what you’re looking for.

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About this Hands-on Lab

Learning Objectives

Additional Resources

Plans & Pricing

Choosing is the first step

Business Basic

Business Plus

Learning without limits

Learn faster by doing

Take your teams from novice to guru

Cloud on demand

SSH on demand

Learn by doing

Keep up with the cloud

Put skills to the test

Pop quiz, hot shot

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Keep ACG in your pocket

Learn off the grid

Achievement unlocked

For the record

Study aids on demand

We’re here to help

One dashboard to rule them all

Manage cloud learning for teams

Know where you stand

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Learn better together

Skills at a glance

Easy organization by teams

Invite 10 to 10,000 or more

Connect all the dots

Get your bits

We’ve got your back

We’ll show you the ropes

Plans & Pricing

Choosing is the first step

Free

Personal Basic

Personal Plus

Learn without limits

Pop quiz, hot shot

Keep up with the cloud

Cloud with friends

Go from novice to guru in your chose specialty

Keep ACG in your pocket

Learn off the grid

Get your hands cloudy

Put your skills to the test

Study aids on demand

For the record

Achievement unlocked

We’re here to help

Cloud on demand

SSH on demand

Learn by doing

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