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Questions[safely](ubuntu)

Martin Hope
Syntaxy
Asked: 2020-05-14 17:37:25 +0800 CST
  • 0

I'm thinking about security, I've done a specific setup to run rsync over internet and was thinking about security, this is the setup:

Destination server has a ssh jail user only with bash and rsync with a folder called files mounted containing files, nothing more.

Source server runs: rsync [params] /source -e "ssh -p [port]" destjaileduser@destinationserver:/files/

If someone discover the password of jailed user, he can only run rsync, nothing else(rsync is needed for remote sync, can't remove).

Question is: It's possible for this jailed user to made his way out of the jail and access the system by any way, since he is limited? If yes, what can be done to prevent it?

The only thing I thought he could do, is place some program in rsync source and run rsync to send to server, but he could do anything, since he is jailed and can't see the real system, right? The files, if affected by ransomware or wiped out, no problem, they have cryptography and is copied to another place the jailed user can't see.

Am I doing things right?

ssh bash rsync safely
Martin Hope
Aquarius Power
Asked: 2020-03-22 15:59:06 +0800 CST
  • 3

I use Synaptic to upgrade my Ubuntu 18.04.

I am concerned on having problems in case of a blackout (that is not uncommon).

What I have been doing is to update at most about 20 packages at once, and always from the bigger to the smaller (I chose the Synaptic filter "Status/Installed(upgradable)"). But huge packages like more than 50MB, I update individually...

But I am still not sure how safe that is?

What is the worst thing that could happen? My machine stop booting (broken boot) in case blackout happens during an upgrade? Or is it fail proof?

And what I do is somewhat time-consuming... could it improve in some way (if there is no other better way)?

I always thought install scripts should/would continue after reboot automatically, but I never tried that (to suddenly turn off the machine) to see what happens, so?

upgrade safely
Martin Hope
sam islam
Asked: 2019-07-14 19:56:49 +0800 CST
  • 2

Installation type window Ubuntu

I have 2 partitions, my system file, swap.. every thing is on the partition which named now (free space) because I clicked the [-] button. The second partition is the partition where I usually store some important data in and I don't want to erase it.

What I want to do is to Erase the partition which called (free space) safely, mean if someone installed photoRec for example he will not be able to recover my old files. I found here on this website many answers, but all of what I found guides the user to erase all of his disk; but I don't want to do that, I just want to erase one partition, because the secret data is stored there (in free space). I don't know what is the name of this method, maybe it's replacing the free data on the partition with zeros, (I don't know but want the safest). Another question: the hacker can't recover the files on my partition (free space) after erasing it safely even if the another partition (/dev/sda4 ntfs) is still on my device without erasing, true?

format disk safely
Martin Hope
ntruter42
Asked: 2019-05-07 13:25:23 +0800 CST
  • 31

I'd like to install a certain bash script called 42FileChecker using the commands:

git clone https://github.com/jgigault/42FileChecker ~/42FileChecker &&
    cd ~/42FileChecker &&
    bash ./42FileChecker.sh

But I don't know if 42FileChecker.sh will do any strange things on my PC because I'm a beginner and don't know what is happening in that script. Is there a way to run it in a dummy terminal or dummy root folder or something like that to see what happens so that I avoid something crazy like formatting of my drives. I'd like to know of any way to test shells for future shell scripts also, even if 42FileChecker.sh is safe.

scripts testing safely