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Cake day: July 9th, 2023

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  • I’ve found HSBC to be ok using Firefox on Linux. I don’t know if they have integrations with any accounting software, but the web access works well, and you can export your transactions for processing locally.

    ETA: I’ve run small business accounting on Gnucash, I found the learning curve a bit steep, but once you ‘get it’ it’s handy.


  • Sorry for the slow reply, life occurred.

    I think I understand where you’re coming from with the desired to be productive and not reinstall. I think I’ve been there too! One thing that I can suggest, if you do have the time, is to learn a system like Ansible and use it to setup and configure your machine. The discipline of keeping all of the config as source rather than making ad-hoc changes reduces the chance of thinking you’ll make just one little change and breaking something, and, if something does go wrong, you can get back to your working configuration quickly.

    Bearing in mind that there really isn’t anything you can do to stop yourself if you’re really determined to not lose the data, because if you can read it at any time you can back it up, the closest you are likely to come is something like creating new key with GPG then using the TPM to wrap your secret key and deleting the original. That way the key is only usable on that specific machine. Then use the key-pair to encrypt your ‘guard’ files. You can still decrypt them because you have the wrapped secret keys and you’re on the same machine, but if you wipe the drive and lose those keys the data is gone. The TPM wrapping prevents you from taking the keys to a different machine to decrypt your data.

    There’s an article with some examples here,

    Having said all of that, this still doesn’t help if you just clone the disk as all of the data, including the wrapped key and the encrypted files will be cloned. The one difference there is that the serial number of the hard drive will be different. Maybe you could use that, combined with a passphrase as the passphrase for your GPG key, but we’re getting into pretty esoteric territory here. So you could generate a secret key with a command like:

    ( lsblk -dno SERIAL /dev/sdb ; zenity --title "Enter decrypt password" --password) | sha1sum | cut -c1-40
    

    Where /dev/sdb is the device your root partition is on. zenity is a handy utility for displaying dialogs, there are others available. In this use it just prompts for a passsword. We then concatenate the drive serial number from lsblk with the password you entered and hash the result. The hashing is really only a convenient way to mix the two without worrying about the newline lsblk spits out. Don’t record the result of this command, but use it to set the passphrase on your new GPG key. Wrapping the secret key in the manner the article above suggests is a nice extra step to make it harder to move the drive to another machine or mess around in that sort of way, but not strictly necessary as that wasn’t in the scope of your original question.

    Now you can encrypt your file with: gpg -e -r <your key name> <your file>'. That will produce an encrypted version of <your file>called<your file>.gpg. To decrypt the file you can get gpg` to use the hashing command from above to get the passphrase with something like:

    gpg -d --pinentry-mode=loopback --batch --passphrase-fd 3 <your file>.gpg 3< <( ( lsblk -dno SERIAL /dev/sdb ; zenity --title "Enter decrypt password" --password) | sha1sum | cut -c1-40 )
    

    Once you’ve tested that you can decrypt the file successfully you can remove the original, plaintext, file. Your data is now encrypted with a key that is secured with a passphrase made of a string you know and the serial number of your disk and optionally wrapped with a key from the TPM that is tied to your physical machine. If you change the disk or the machine the data is irretrievable (ignoring the caveats discussed above). I think that’s about as close to your original goal as you can get. It’s rough around the edges, and I’m not sure I’d trust my data to it, but I believe it’ll work. If you do something like this, please test it thoroughly, I can’t guarantee it!


  • This seems like a very complicated way to achieve your goal! It sounds like sitting yourself down and giving you a stern talking to might be a beter aporoach.

    Having said that, if you have these very important files that you don’t want to lose, please make sure they’re backed up somewhere off of your machine. Storage fails, and it’s a horrible feeling losing something important. Unfortunately doing so would defeat the approach you’re thinking of.

    This might be a case of needing to reframe the question to get to the cause of the issue, and then solve that. So, why do you want to make it hard to reinstall your machine? Is it the amount of time you spend on it, the chance of screwing it up, needing it working, has it become a compulsion or something else? Maybe if we can get to the root of the issue we can find a solution.

    With regard to TPM, it’s basically just a key store, so you can use it fir anything really, althought it’s normally used by generating a TPM key and using it to encrypt the key that’s actually used to encrypt your data, storing the encrypted key with the OS. Just reinstalling won’t wipe the TPM, but unless you made an effort to save the encrypted key it’ll be gone. Given your problem statement above it just adds to the data you’d need to save, which isn’t helpful.


  • Ok, I’m still not clear on exactly what you’re trying to achieve as I can’t quite see the connection between somehow preventing certain files being duplicated when cloning the disk and preventing yourself from reinstalling the system.

    Bear in mind that reinstalling the system would replace all of the OS, so there’s no way to leave counter-measures there, and the disk itself can’t do anything to your data, even if it could detect a clone operation.

    If what you’re trying to protect against is someone who knows everything you do accessing your data, you could look to use TPM to store the encryption key for your FDE. That way you don’t know the password, it’s stored encrypted with a secret key that is, in turn, stored and protected by your CPU. That way a disk clone couldn’t be used on any hardware except your specific machine.


  • Nothing can prevent a disk clone cloning the data, and there’s no way to make something happen when a disk is cloned as you’re not in control of the process.

    If you wish to mask the existence of the files, use either full disk encryption, in which case cloning the disk doesn’t reveal the existence of the files without the decrypt password, or use a file based encrypted partition such as veracrypt in which case the cloner would just see a single encrypted blob rather than your file names.

    Ultimately encrypting the files with gpg means they have already effectively ‘destroyed or corrupted’ themselves when cloned. If you don’t want to reveal the filenames, just call them something else.

    If you could be a bit more specific about your threat model people may have better ideas to help.






  • While I agree with most people here that finding a keyboard and screen would be the easiest option, you do have a couple of other options:

    • Use a preseed file A preseed lets the installer run completely automatically, without user intervention. Get it to install a basic system with SSH and take it from there. You’ll want to test the install in a VM, where you can see what’s going on before letting it run on the real server. More information here: https://wiki.debian.org/DebianInstaller/Preseed

    • Boot from a live image with SSH Take a look at https://wiki.debian.org/LiveCD in particular ‘Debian Live’. It looks like ssh is included, but you’d want to check the service comes up on boot. You can then SSH to the machine and install to the harddrive that way. Again, test on a VM until you know you have the image working, and know how to run the install, then write it to a USB key and boot the tsrget server from that.

    This all assumes the target server has USB or CD at the top of its boot order. If it doesn’t you’ll have to change that first, either with a keyboard and screen, or via a remote management interface sych as IPMI.


  • It’s the same problem with a drive like this, or any long term archive, you either store the data unencrypted and rely on physical security, or make sure you store the encryption key and algorithm for the same length of time, in which case you still need the physical security to protect that instead. In both cases you need to make sure you preserve a means to read the data back and details of the format its in so you can actually use it later.

    Paper is actually a pretty good way of storing a moderate amount of data long term. Stored correctly it’s unlikely to physically degrade, the data is unlikely to suffer bitrot and it can be read back by anything that can make an image in the visible spectrum. That means you can read it, or take a photo and use OCR to convert it into whatever format is current when the data is needed.




  • “Make it easy for them to give you what you want”

    There’s a lot of ways to interpret that, and most of them help. For instance, if you’re asking your boss for a raise, if you just say “Hey boss, gimme a raise” you’re making it hard for them. If you say “I think I deserve a raise, here are multiple, documented, examples of where I’ve helped increase revenue/fix a problem that could have cost us/improved customer retention/etc” then you’re making it easier for them because they have a list of positives to justify it.

    Generally if you’re asking a question you need an answer to, or for something in particular, spend a little time thinking about the request from the other person’s point of view. What do they need to be able, and inclined, to help you? When you know that, make sure you supply it.

    I’ve found it to be a powerful way of approaching discussions, and it can make a lot of situations make more sense when you realize one party didn’t do it and didn’t get what they want.

    Sometimes, of course, making it easy to give you what you want just means making any other outcome harder instead. >:)





  • The internet in it’s heyday, when it was a genuinely thrilling place to find information, and quite a lot of weirdness, and before it was swamped by corporate interests.

    I remember starting out with gopher and a paper print out of ‘The big dummies guide to the internet’ which was a directory of almost every gopher and ftp site (pre web) along with a description of what you’d find there. Then the web came along and things got really good for a while. Once big corporations got involved it all went down hill.


  • Ah, ok. You’ll want to specify two allowedip ranges on the clients, 192.168.178.0/24 for your network, and 10.0.0.0/24 for the other clients. Then your going to need to add a couple of routes:

    • On the phone, a route to 192.168.178.0/24 via the wireguard address of your home server
    • On your home network router, a route to 10.0.0.0/24 via the local address of the machine that is connected to the wireguard vpn. (Unless it’s your router/gateway that is connected)

    You’ll also need to ensure IP forwarding is enabled on both the VPS and your home machine.


  • Sort of. If you’re using wg-quick then it serves two purposes, one, as you say, is to indicate what is routed over the link, and the second (and only if you’re setting up the connection directly) is to limit what incoming packets are accepted.

    It definitely can be a bit confusing as most people are using the wg-quick script to manage their connections and so the terminology isn’t obvious, but it makes more sense if you’re configuring the connection directly with wg.