Need help with Lab 35.2

cloud4amar

Hello,

I need help with lab 35.2 step 2.
Upon copying the ping utility as ping-x, I ran the ping-x utility as instructed in step 2. However, it did not reproduce the expected error message "ping: socket: Operation not permitted."

Please refer to screenshot below:

coop

hmm there does seem to be a problem. We'll investigate

lee42x

Investigating, looks like a couple of things.

Please verify step 1 worked and installed apparmor-profiles and apparmor-utils were installed.

Thanks

cloud4amar

Hello @lee42x,

I have verified step 1. It worked. Both apparmor-profiles and apparmor-utils were installed with the newest versions.

Below is the screenshot for reference:

lee42x

Hi cloud4amar, This is an interesting issue, the malfunction you are seeing seems to be Ubuntu related. I was testing and not making excellent progress on Ubuntu (various versions) so I took a clean LF-Debian.11 image and that seems to work exactly as we expect. The steps for my test are:
1. sudo which ping results /usr/bin/ping
2. student$ /usr/bin/ping -c 3 -4 127.0.0.1 results, completed ping successfuly
3. sudo getcap /usr/bin/ping results, /usr/bin/ping cap_net_raw=ep
4. sudo setcap -r /usr/bin/ping results, capability removed
5. student$ /usr/bin/ping -c 3 -4 127.0.0.1 results /usr/bin/ping: socket: Operation not permitted

This is what we want, then the rest of the lab should work. I will continue sort out what is up with Ubuntu and post an update later today.

Lee