So, I have a few services (Jellyfin, Home Assistant, etc) that I am running, and have been acessing via their IP’s and port numbers.
Recently, I started using NGINX so that I could setup entries in my Pi Hole, and access my services via some made up hostname (jellyfin.home, homeassistant.home, etc).
This is working great, but I also own a few domains, and thought of adding an SSL cert to them as well, which I have seen several tutorials on and it seems straight forward.
My questions:
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Will there be any issues running SSL certs if all of my internal service are inward facing, with no WAN access? My understanding is that when I try to go to jellyfin.mydomainname.com, it will do the DNS lookup, which will point to a local address for NGINX on my network, which the requesting device will then point to and get the IP of the actual server.
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Are there risks of anything being exposed externally if I use an actual CA for my cert? My main goal is to keep my home setup off of the internet.
i have a similar setup at home. the way i did it was using certbot and dns verification. i pointed my domain’s NSs to digitalocean’s NS and then i downloaded the certbot-digitalocean-dns plugin, created an API key for DO and stored it somewhere and then certbot took care of everything else. nothing is exposed to the internet
Very nice! And you don’t have to worry about adding the cert to each device that wants to use the service, right? Since this isn’t a self hosted CA.
Here’s a script to do it with several different DNS providers: https://github.com/acmesh-official/acme.sh I personally set the renew as a weekly cronjob and never have to think about it.
Ooo, very nice! If I use that script, can I generate certificates for a made up domain within my network (eg *.homelab), or do I need to use a domain I actually own?
It would have to be a domain you actually own
If you use Let’s Encrypt, or any public CA, all of your domains and certificates will be public. You can use a wildcard to avoid revealing subdomains. There is a website that you can use to search what is available, but I don’t remember what it is.
I suspect there aren’t any serious risks to having that information revealed. The only real reason would be privacy against which services you are using on that domain.
yeah true but if the DNS records aren’t actually pointing anywhere then there’s no real threat no? because everything stays in the internal network
This is probably the site you’re thinking of - https://crt.sh/
You can use duckdns.org to create a subdomain, set the domain name to your local IP and then use let’s encrypt DNS challenge to issue a trusted certificate
People can see what domains you use with TLS, but that could be OK: https://letsencrypt.org/docs/ct-logs/
You can use a wildcard cert to avoid leaking subdomains.
Will there be any issues running SSL certs if all of my internal service are inward facing, with no WAN access?
If you’re using a third party CA, periodically renewing certificates in my experience. The authority needs to be able to connect to the device it’s issuing a cert to, for it to handle a security challenge iirc.
If you set up your own CA, none that I know of.
My main goal is to keep my home setup off of the internet.
Then I don’t understand the need for neither domain names nor third party signed certs. Can’t you use PiHole as a configurable DNS server, just make any domain name go to any of your local devices?
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Neat, might have to look more into that the next time I redo my setup.
DNS challenge is the way to go. I just did it couple of weeks ago. Here is youtube video of the process. He uses duckdns but I personally used cloudflares dns
That was my concern too. NGINX would need access to the internet in order to renew the certs.
Then I don’t understand the need for neither domain names nor third party signed certs. Can’t you use PiHole as a configurable DNS server, just make any domain name go to any of your local devices?
Yes, that is how it is currently setup, and how I may end up leaving it. Right now, I can go to jellyfin.home, and that request gets routed to my pihole which has custom DNS entries, which then points to NGINX and NGINX forwards it to the correct IP/ port. All works as expected, except it is not https (which is not that big of a deal since all my stuff is restricted from the outside world). Just an OCD itch I’m trying to scratch.
Hey, I advocate https even for LAN only, most people don’t think about the Wifi attack vector. That’s why I use self signed certs on my LAN stuff, I just don’t care about that yellow padlock that disappears when I trust the website. I’ve only experienced a single app ever that didn’t accept self-signed (I’m looking at you wallabag app).
I can understand how it would be different if family members suddenly starts asking if it’s true when their devices tell them the webside is potentially dangerous.
Yes, it’s dangerous to surveillance capitalism
People… watching money?
Forget it, I’ll set it up with a regular cert and external access
Have you looked at something like :
It offers a free CA for self-hosted stuff. It does TLS certs, and others. It’s very useful for avoiding the high fees
I have heard of this, but I think if you self-host a CA, you have to add the cert to every device that wants access to the service right? For example, I’d have to add it to my TV if my TV connects to Jellyfin, to my laptop if my laptop needs access to Home Assistant, etc. I’m not sure my family would like that XD
Lets encrypt certificates are trusted by everything I’ve tried.
Shouldn’t be any risk if it’s all local.
For an internal domain you’ll need to set up your own internal CA to sign certs for your fqdns. The risk comes from any mishandling of that new CA since you’ll need to install it as a trusted root on all of your devices and if someone gets a hold of it nothing would stop them from creating a MITM attack for let’s say yourbank.com
If you have the CA’s key under lock then you should be good.
Don’t use internal domain, use standard domain + split DNS instead. Much simpler to handle certificates for internal services with ACME protocol.
For an internal domain you’ll need to set up your own internal CA
No real need to run your own CA. As long as you have an actual domain name, you can use Let’s Encrypt with DNS challenges to get certificates for internal servers.
