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You're reading from  Mastering Linux Security and Hardening

Product typeBook
Published inJan 2018
Publisher
ISBN-139781788620307
Edition1st Edition
Tools
Linux
Concepts
Cybersecurity
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Author (1)
Donald A. Tevault
Donald A. Tevault
author image
Donald A. Tevault

Donald A. Tevault - but you can call him Donnie - got involved with Linux way back in 2006, and has been working with it ever since. He holds the Linux Professional Institute Level 3-Security certification, and the GIAC Incident Handler certification. Donnie is a professional Linux trainer, and thanks to the magic of the internet, teaches Linux classes literally the world over from the comfort of his living room. He's also a Linux security researcher for an IoT security company.
Read more about Donald A. Tevault

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Troubleshooting AppArmor problems

So, I've been here racking my brain for the past several days, trying to come up with a good troubleshooting scenario. It turns out that I didn't need to. The Ubuntu folk have handed me a good scenario on a silver platter, in the form of a buggy Samba profile.

As you've just seen, I used aa-enforce to put the two Samba-related profiles into enforce mode. But, watch what happens now when I try to restart Samba in order to get the profiles to take effect:

donnie@ubuntu3:/etc/apparmor.d$ sudo systemctl restart smbd
Job for smbd.service failed because the control process exited with error code. See "systemctl status smbd.service" and "journalctl -xe" for details.
donnie@ubuntu3:/etc/apparmor.d$

Okay, that's not good.  Looking at the status for the smbd service, I see this:

donnie@ubuntu3:/etc/apparmor.d$ sudo systemctl status smbd
● smbd.service - LSB: start Samba SMB/CIFS daemon (smbd)
   Loaded: loaded (/etc/init.d/smbd; bad; vendor preset: enabled)
   Active...
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Mastering Linux Security and Hardening
Published in: Jan 2018Publisher: ISBN-13: 9781788620307
© 2018 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Donald A. Tevault

Donald A. Tevault - but you can call him Donnie - got involved with Linux way back in 2006, and has been working with it ever since. He holds the Linux Professional Institute Level 3-Security certification, and the GIAC Incident Handler certification. Donnie is a professional Linux trainer, and thanks to the magic of the internet, teaches Linux classes literally the world over from the comfort of his living room. He's also a Linux security researcher for an IoT security company.
Read more about Donald A. Tevault

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