No. I run my servers on low quality shit and I expect them to break any time. Never had to perform a data recovery but if I need, I'll thank myself I didn't encrypt my pics
this post was submitted on 16 Apr 2024
89 points (96.8% liked)
Selfhosted
40152 readers
434 users here now
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
Rules:
-
Be civil: we're here to support and learn from one another. Insults won't be tolerated. Flame wars are frowned upon.
-
No spam posting.
-
Posts have to be centered around self-hosting. There are other communities for discussing hardware or home computing. If it's not obvious why your post topic revolves around selfhosting, please include details to make it clear.
-
Don't duplicate the full text of your blog or github here. Just post the link for folks to click.
-
Submission headline should match the article title (don’t cherry-pick information from the title to fit your agenda).
-
No trolling.
Resources:
- selfh.st Newsletter and index of selfhosted software and apps
- awesome-selfhosted software
- awesome-sysadmin resources
- Self-Hosted Podcast from Jupiter Broadcasting
Any issues on the community? Report it using the report flag.
Questions? DM the mods!
founded 1 year ago
MODERATORS
Power user move!
on my NAS i do and work data as well.
Yes.
My home server has dropbear-initramfs installed so that after reboot I can access the LUKS decryption prompt over SSH. The one LUKS partition contains a btrfs filesystem with both rootfs and home as subvolumes. For all the other drives attached to that system, I use ZFS native encryption with a dataset that decrypts with a keyfile from that rootfs and I have backups of an encrypted copy of that keyfile.
I don't think there's a substantial performance impact but I've never bothered benchmarking.
I want to, but haven't found the time to make a strategy on how to move over the data. It would take a bunch of shuffling as all drives are in use. The next problem is decrypting at boot and securely storing the decryption key - if I choose to use a decryption key at all. Maybe it'll be a usb key that I have to plug into the server when starting it, or I have to setup decryption of the system over SSH, but that means automated restarts are... difficult.
Not sure how to tackle the problem yet...
I use separate disks for data storage and my OS. That way a headless system can boot and all the services like SSH can become available, and I can decrypt the data drives remotely.
When there's an unexpected reboot I can still get into my system and decrypt remotely which is nice. I can also move the data storage disks to another system without too much hassle.
I did have to make sure some services were fault tolerant if an encrypted volume was unavailable when the OS booted. An example of this might be torrenting software, I needed to make sure the temporary storage was on an encrypted volume. The software had a sane fault mode when the final storage location was unavailable, but freaked out for some reason when the temp storage was missing.
Once set up the whole thing is pretty easy to manage.
I did have to make sure some services were fault tolerant if an encrypted volume was unavailable when the OS booted
How did you achieve that? systemd dependency?
I'm pretty sure I didn't mess with systemd, though that would probably be the right way to handle it.
I was able to update a runtime config so if any storage wasn't available it just halted the service. Then I created a short script I'd invoke manually which decrypted the luks drives and brought the dependent services up. I also added monitoring to alert me when the drives weren't available for whatever reason.
I used to until I realized that I’ve got bigger threats to worry about.
And like someone else mentioned, if I have to do data recovery for some unknown reason I want to make sure the data’s not encrypted.
Why? If you store the key in your password manager shouldn't be a problem to mount the drive on another PC, decrypt it and save data. Or am I missing something?
Recovering data from a corrupted, encrypted drive is way trickier than from a simply corrupted drive, I imagine.
Why? What would be the problem?
P.s. Why did you link to the Anti Commercial-AI license?
The way you recover data from a totally dead drive is use a program that scans every byte and looks for structures in the data that look like files e.g. a jpeg will have a header followed by some blocks of content. In an encrypted drive everything looks like random data.
Even if you have the key, you can’t begin searching through the data until it’s decrypted, and the kind of error that makes it so your drive won’t mount normally is likely to get in the way of decrypting normally as well.
Why? What would be the problem?
On linux, you're probably using LUKS. That has a header with the keys at the beginning of each encrypted volume. If those keys (or key if you only have one) is corrupted and you don't have a backup of that, you're fucked.
The next problem is that data recovery tools mostly don't support decryption. They scan regions or the entire drive for recognizable things like partition headers, partition tables, file types, etc. if those are encrypted, well...
If you are able to decrypt a partition, then it might work as it will show up like any other device in /dev/mapper/ and you could do recovery /dev/mapper/HDD. However, I have no idea what data corruption does to encryption algorithms. If one part of what is being decrypted is faulty, what does that do to the entire thing?
This mostly comes from a lack of knowledge on my part. IIRC encryption depends on hashsums -> if you change what's being decrypted/encrypted, the entire hashsum is incorrect and thus all the data shouldn't be able to be decrypted. But I might be wrong - I'll gladly be wrong on this.
On linux, you’re probably using LUKS. That has a header with the keys at the beginning of each encrypted volume. If those keys (or key if you only have one) is corrupted and you don’t have a backup of that, you’re fucked.
I got it, thanks! I will rely on SnapRaid form redundancy and on backups on multiple devices/locations.
Yup and negligible. If I'm forced to contend with a windows environment bitlocker is utilized.
I also utilize a ram disk in a windows os. Imdisk in windows. I migrate temp files and logs into the ram disk. It saves on disk writes and increases privacy.
If pretty straightforward to encrypt if utilizing Linux right from install time.
As for my server I too utilize nextcloud. However, the nextcloud data is on a zfs dataset. This dataset is encrypted.
I did this by installing nextcloud from docker running within a proxmox container. That proxmox lxc container has the nextcloud dataset passed into it.
I did this by installing nextcloud from docker running within a proxmox container. That proxmox lxc container has the nextcloud dataset passed into it.
That's almost what I'm doing (I'm using a VM in Proxmox where I install all my Docker containers). Right now I'm thinking about encrypt only the data volume (a NFS share from Proxmos host) since all the sensible data will be there.
No
I encrypt devices that are portable. If someone raids my house I have bigger fish to fry.
If someone raids my house I have bigger fish to fry. Sure, but if it's "free", why not do it? My main worry was about performances, but since I've read that with AES-NI it doesn't impact that much and since it seems not to be that complicated (let's hope! 😁).
view more: next ›