ISO verification
ISO verification
Hello guys, I'm using Arch as a newbie. Learning about it. But worried about a thing. When I was creating the bootable media for install it, I downloaded the .iso and .iso.sig from any mirror that is near. I followed the things about verification of .iso but I got some errors and gave up. Just used the iso I didn't verificated. I am using the OS that iso installed. There is nothing wrong with usage. I can access all the things about Arch, not had any problems and any performance issues. No special internet usage, no broken things etc. but I'm a bit worried about is there any malicious software such as keyloggers, mining softwares... Can I verify my Arch after the installation? Can I see if there is any software malicious via htop-bpytop? Should I create the bootable media again with verification and reinstall my Arch?
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When I was creating the bootable media for install it, I downloaded the .iso and .iso.sig from any mirror that is near. I followed the things about verification of .iso but I got some errors and gave up.
There's two different things. The checksum and the GnuPG signature. If you used the GnuPG method to check the signature I can imagine you got a warning because of the GnuPG key owner trust and that's actually expected behavior and should not worry you. Normally when you exchange GnuPG keys with a person in real life, you can compare key fingerprints and after that you would set the owner trust yourself for their key, but with downloaded iso images this is a different use case though if you really want you can set the owner trust to make the warning go away.
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Oh, I didn't know that. I just downloaded iso and iso.sig then used gpg commands. The thing I'm worried about is, maliciousy chance of the iso. I probably used German or French mirror to download the iso. Then, failed the verification. I am using unverificated iso's Arch Linux now. Can I know if I had any tracker, keylogger or mining software etc. ? Usage is normal and smooth as how it have to be. But idk.. Just worried. I still have the same bootable USB that the iso was extracted into. I have a FreeDOS unnecessary PC. Can I verificate the bootable by executing any verification command while I'm at the installation process? Or, can I verify or check my operating system's originality at post-installation era of my main PC? Thanks for comment.
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Oh, I didn’t know that. I just downloaded iso and iso.sig then used gpg commands. The thing I’m worried about is, maliciousy chance of the iso. I probably used German or French mirror to download the iso. Then, failed the verification.
Suggesting the following for the archlinux-2024.05.01-x86_64.iso :
- Put your downloaded iso file and the sig file in ~/Downloads/ if you haven't done so.
- From your Arch Linux installation install the Sequoia sq tool :
sudo pacman -S sequoia-sq - Continue with the following commands :
cd ~/Downloads sq network wkd fetch pierre@archlinux.org -o release-key.pgpsq verify --signer-file release-key.pgp --detached archlinux-2024.05.01-x86_64.iso.sig archlinux-2024.05.01-x86_64.iso
This should unlike with the GnuPG method give no warnings or errors.
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Just verify the iso you downloaded. If the signature is correct, the iso is safe.
You can simply
$ sha256sumthe iso file and verify.But honestly, you're probably safe. I wouldn't be worried in your place.
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The sha256 only validates file integrity, it doesnt ensure legitimacy. A malicious actor would replace both the iso and the checksum at the same time.
Only the signature ensures legitimacy, but properly setting up the chain of trust is near impossible anyway without meeting face-to-face with the iso signer.
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I did download and set the bootable at my previous OS, Fedora. Now the iso is not reachable and I forgot the mirror that I downloaded from. I still have the usb card I used for installation. Can I do any verification over it? Thanks for reply and relaxing info.
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Should you trust something that failed verification? No. That's the whole point. It's not what you think it is.
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I mean fail as error. Like, I did something wrong at commands. I haven't verificated the iso about its valid or not. That's the thing I'm worried about. I asked can I verify with other ways without the iso. But I decided to do clean re-install. Thanks for comment. Goodbye.
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