this post was submitted on 28 Oct 2023
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Help hosting Vaultwarden local only (alien.top)
submitted 1 year ago by [email protected] to c/[email protected]
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Hello, I've been looking at many guides but I'm having trouble understanding how to selfhost VaultWarden locally. Could someone help me understand how I could achieve this considering,

  • I don't have a domain
    • It would be nice to do something like vaultwarden.local or vaultwarden.homelab.local instead of typing in the homelab's pc static ip and the port vaultwarden is on
  • I don't want to expose anything outside of my local network
    • Security reasons
    • I am now well versed in networking so I don't want to risk leaving an entry point for unwanted users or hackers

I also learned that I would need to sign certificates to be able to access it on some browsers and the additional security. I learned that Traefik offers self-signed certificates, but every video I have seen starts talking about needing a domain and cloudflare tunneling and I get lost.

It would be nice if I could get help or advice from the r/selfhosted community because I am new to all of this but want to learn and host more applications and services locally. Thank you.

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[–] [email protected] 1 points 1 year ago

Let's Encrypt uses what is called "ACME protocol" for proof of owner when generating certificates.

There are various challenges they use to prove ownership of the domain. The default one just places a special file on your web server that Let's Encrypt then reads.

However there are a number of different types of challenges.

If you don't want to expose anything to the internet then a common one to use is 'DNS Challenge'.

With DNS challenge the certbot uses your DNS server/provider's API to update DNS records as a response to the challenge. Let's Encrypt reads the special TXT response and verifies that you own the domain.

So to use this you need two things:

  1. A DNS domain

  2. A DNS domain provider that has a API that certbot can use.

AWS Route53 is a good one to use. But I have used Digital Ocean's free DNS Service, Bind servers, Njalla, and other things. Most commonly used DNS providers are supported one way or the other.

You can also get fancy and designate sub domains or other domains to respond to the challenges. So if your DNS is locked down you can still add a record to point to a different one on a different server.

The big win for going with DNS Challenge is that you can do wildcard certificates.

So say you are setting up a reverse proxy that will serve vault.home.example.com, fileshare.home.example.com, torrent.home.example.com, and a bunch of others... all you need to do is configure your reverse proxy with a single *.home.example.com cert and it'll handle anything you throw at it.

You can't do that with the normal http challenge. Which makes doing the DNS challenge worth it, IMO, even if you do have a public-facing web server.