Reverse proxy

Submitted ⁨⁨6⁩ ⁨months⁩ ago⁩ by ⁨mfat@lemdro.id⁩ to ⁨selfhosted@lemmy.world⁩

I have an openwrt router at home which also acts as my home server. It’s running a bunch of services using docker (Jellyfin, Nextcloud, etc.)

I have set up an SSH tunnel between my openwrt router and VPS and can access jellyfin successfully.

I understand that I need to set up a reverse proxy to access multiple services and have https.

But I’m confused if I should set up this reverse proxy on the VPS or on the router itself. Is nginx the easiest option? Should i add subdimains in cloudflare for every service?

Pease don’t recommend vpns since they are all blocked where i live (wireguard, tailscale openVPN, etc.) I’m limited to using ssh tunneling only.

Thanks

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lemmyvore@feddit.nl ⁨6⁩ ⁨months⁩ ago
I should also add something that lots of beginners miss.

The reverse proxy does not care what the domains that you define in it actually resolve to. It receives the domain name as a HTTP header which is completely at the whim of the client. As long as that domain name matches one of the domains defined in the proxy, it’s all good.

You can successfully connect to a proxy with a domain name defined in the domain owner’s DNS, or you can make up your own DNS that says whatever you want, or you can define any domain->IP association you want in your hosts file, or you can simply use curl or wget to connect directly to the proxy IP and lie about the domain in the HTTP headers without having it resolve in any DNS.

This means that yes, the proxy will happily serve your “private” *.local.example.com services to someone connecting from outside your LAN. All they have to do is figure out (or guess) your subdomain names. You need to add IP restrictions in the proxy (default deny from all + lan ip mask explicit exception) if you really want those services to be restricted to the LAN.

DNS is not security, it’s a public service that maps domains to IPs.

TLS is only security in the sense it protects the connection en route from eavesdropping, but it doesn’t restrict access.

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- mfat@lemdro.id ⁨6⁩ ⁨months⁩ ago
  Thanks I understand the theory behind this but I can’t get it to work.
  
  I have a jellyfin.mydomain.com subdomain pointing at my VPS ip. On my home server I have Nginx Proxy Manager listening to 192.168.8.1:8998 (http) and 8999 (https) From my home server I forward port 80 from the VPS to local port 8999 like this:
  
  ssh -R 80:127.0.0.1:8998 root@vps-ip
  
  Then on npm I define a proxy to localhost:8096 (jellyfin) for any traffic sent to jellyfinn.mydomain.com.
  
  But I can’t access jellyfin remotely.
  
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  - lemmyvore@feddit.nl ⁨6⁩ ⁨months⁩ ago
    Check all the steps individually then:
    
    check that the ip resolves to the VPS IP at the location you’re testing this
    
    set up the tunnel to bypass the proxy (connect it directly to jellyfin)
    
    check that jellyfin works directly
    
    check the proxy directly, with curl connected to the proxy with the header “Host” set to the domain
    
    check that the VPS firewall didn’t block port 80
    
    normally you wouldn’t be able to forward port 80 with a normal ssh user but I see you’re logging in as root so it should be working
    
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SorteKanin@feddit.dk ⁨6⁩ ⁨months⁩ ago
Maybe look into nginxproxymanager.com it makes it quite easy to set up.

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- mfat@lemdro.id ⁨6⁩ ⁨months⁩ ago
  Thank you very much my question is should npm be installed on my VPS or my local server? What SSH command should I use to connect the two machines in a way that npm works?
  
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Neon@lemmy.world ⁨6⁩ ⁨months⁩ ago
If you are new i recommend “Caddy V2”

It is by far the easiest.

Wait with Nginx until you’re better. (and even then, use linuxserverio/swag instead of nginx)

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- mfat@lemdro.id ⁨6⁩ ⁨months⁩ ago
  Caddy was exactly what i needed. It magically solved the problem…
  
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- Samsy@lemmy.ml ⁨6⁩ ⁨months⁩ ago
  As someone who used caddy over years, I can’t completely agree.
  
  Caddy has some downsides (nextcloud needs special setup for example) and not everyone is familiar with writing a Caddyfile.
  
  For someone new I would recommend “nginx proxy manager”. Easy to install with docker and self explained through GUI.
  
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  - Neon@lemmy.world ⁨6⁩ ⁨months⁩ ago
    i actually think NPM is more confusing. 1: there are practically always already finished Files for Caddy V2. Most of the times directly in the Repo of the Project. A lot of Devs use Caddy themselves. 2: NPM exposes a lot of Options additionally. This can confuse newcomers. With Caddy, all these extra options are invisible. you just write and see “reverse_proxy jellyfin” and that’s it.
    
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- bork@sh.itjust.works ⁨6⁩ ⁨months⁩ ago
  Swag was my nginx introduction, and it was mildly confusing because I ran it on docker and didn’t understand how to edit configs at the time. I’d recommend following a guide instead of winging it like I did 😅
  
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possiblylinux127@lemmy.zip ⁨6⁩ ⁨months⁩ ago
I know this isn’t what you asked but I would move any hosted services outside of DNS to a separate device.

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dataprolet@lemmy.dbzer0.com ⁨6⁩ ⁨months⁩ ago
How can something like Tailscale be blocked?

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- Felix_lm22@sopuli.xyz ⁨6⁩ ⁨months⁩ ago
  Unfortunately, Deep Packet Inspection does this as Tailscale/Wireguard does not encrypt traffic
  
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  - loutr@sh.itjust.works ⁨6⁩ ⁨months⁩ ago
    Wireguard, like all VPNs, definitely does E2E encryption. What would be the point of an unencrypted VPN?
    
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  - melmi@lemmy.blahaj.zone ⁨6⁩ ⁨months⁩ ago
    It definitely encrypts the traffic, the problem is that it encrypts the traffic in a recognizable way that DPI can recognize. It’s easy for someone snooping on your traffic to tell that you’re using Wireguard, but because it’s encrypted they can’t tell the content of the message.
    
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  - SeeJayEmm@lemmy.procrastinati.org ⁨6⁩ ⁨months⁩ ago
    www.wireguard.com/protocol/
    
    Looks like wireguard encrypts traffic to me.
    
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  - pyrosis@lemmy.world ⁨6⁩ ⁨months⁩ ago
    It’s definitely encrypted they can just tell by signature that it is wireguard or whatever and block it.
    
    They could do this with ssh if they felt like it.
    
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lemmyvore@feddit.nl ⁨6⁩ ⁨months⁩ ago
There are pros and cons to keeping the proxy on the VPS or at home.

If you keep it at home you will have end-to-end encryption from the browser to your home server. Downside, you will not get the IP of the remote client, just the IP of the router, so you won’t be able to do IP blocking or diagnostics.

By putting the proxy on the VPS and decrypting HTTPS there you can add remote IPs to connections but you have to keep the TLS certificate on the VPS so in theory someone could mess with it.

A third option is to run a minimal passthrough proxy on the VPS that adds the remote IP to the HTTPS connections without decrypting them. To do this you must use the same proxy at both ends (home and VPS) and both must have the PROXY protocol enabled.

I would suggest doing just proxy at home to start with because it’s simpler. If you want a GUI use NPM (Nginx Proxy Manager) it’s super easy. If you prefer a proxy where you write config by hand use Caddy.

After you have it working at home you can consider adding the one on VPS and enabling the PROXY protocol. Although I’m not 100% sure Caddy supports it, look into it. You may have to use Nginx in both places I’d it doesn’t.

You do not need to add subdomains in DNS, not unless you want to. You just need one domain to point an A/AAAA record at the VPS public IP, then you can make the subdomains a wildcard CNAME pointing at the base domain. So A/AAAA example.com -> IP, and CNAME *.example.com -> example.com. Or you can put the A in another domain and point the CNAME at that.

When requesting TLS certificates it’s the same thing, you never ask for explicit certificates for each subdomain, you just ask for one wildcard certificate for *.example.com. Aside from the obvious benefit of not having to add and remove certificates every time you add or remove subdomains, there’s the not obvious benefit of not having bots learn about your subdomains (certificate application are public records).

The subdomains do not need to resolve in DNS for this to work, the certbot verifies that you own the domain by using a DNS API key to create a temporary TXT on example.com; as long as that works it won’t care what’s actually defined in there.

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- mfat@lemdro.id ⁨6⁩ ⁨months⁩ ago
  Thanks for the detailed reply. But I’m still confused. Do I need a separate ssh tunnel for every single service I run on my local server?
  
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  - lemmyvore@feddit.nl ⁨6⁩ ⁨months⁩ ago
    No, that’s the magic of the reverse proxy. You can transport all HTTP services through just one port. It will route them to the correct service on your service based on the domain (which is passed through the HTTP headers).
    
    It won’t work for non-HTTP services, for those you’ll have to make a separate ssh tunnel per port.
    
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  - atzanteol@sh.itjust.works ⁨6⁩ ⁨months⁩ ago
    The reverse proxy is going to have a config that says “for hostname ‘foo’ I should forward traffic to foo.example.com:port”.
    
    If you setup the rproxy at home then ssh just needs to forward all port 443 traffic to the rproxy. It doesn’t care about hostnames. The rproxy will then get a request with the hostname in the data and forward it to the appropriate target on behalf of the requester.
    
    If you setup the rproxy at the vps then yes - you would need to forward different ports to each backend target. This is because the rproxy would need to direct traffic to each target individually. And if your target is “localhost” (because that’s where the ssh endpoint is) then you would differentiate each backend by port.
    
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bin_bash@lemmy.world ⁨6⁩ ⁨months⁩ ago
Check “boring proxy” On github easy to install and configure and does https for you

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HappyRedditRefugee@lemm.ee ⁨6⁩ ⁨months⁩ ago
Either you run the RP in the VPS and point to the ips on your server or you run it on the server and access it like you are accessing Jellyfin.

Easiest option is a container with Nginx proxy manager (imo) with NPM you can get free let’s encrypt certs, but be aware, in case you want automated certificates, NPM will need to run on the machine pointed to by the DNS (in your case, your VPS I guess)

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pyrosis@lemmy.world ⁨6⁩ ⁨months⁩ ago
Usually a reverse proxy runs behind the firewall/router. The idea you are pointing 80/443 at the proxy with port forwarding once traffic hits your router.

So if someone goes to service.domain.com

You would have dynamic DNS telling domain.com the router is the IP.

You would tell domain.com that service.domain.com exists as a cname or a record. You could also say *.domain.com is a cname. That would point any hosttname to your router.

From here in the proxy you would say service.domain.com points to your services IP and port. Usually that is would be on the lan but in your case it would be through a tunnel.

It is possible and probably more resource efficient to just put the proxy on the VPS and point your public domain traffic directly at the VPS IP.

So you could say on the domain service.domain.com points to the VPS IP as an a record. Service2.domain.com points to the VPS IP as another a record.

You would allow 80/443 on the VPS and create entries for the services

Those would look like the service.domain.com pointing to localhost:port

In your particular case I would just run the proxy on the public VPS the services are already on.

Don’t forget you can enable https certificates when you have them running. You can secure the management interface on its own service3.domain.com with the proxy if you need to.

And op consider some blocklists for your vps firewall like spamhaus. It wouldn’t hurt to setup fail2ban either.

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Decronym@lemmy.decronym.xyz ⁨6⁩ ⁨months⁩ ago

Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I’ve seen in this thread:

Fewer Letters	More Letters
DNS	Domain Name Service/System
HTTP	Hypertext Transfer Protocol, the Web
HTTPS	HTTP over SSL
IP	Internet Protocol
SSH	Secure Shell for remote terminal access
SSL	Secure Sockets Layer, for transparent encryption
TLS	Transport Layer Security, supersedes SSL
VPS	Virtual Private Server (opposed to shared hosting)

[Thread #738 for this sub, first seen 5th May 2024, 12:15] [FAQ] [Full list] [Contact] [Source code]

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purplemonkeymad@programming.dev ⁨6⁩ ⁨months⁩ ago
It depends where you want the complexity.

Since ssh is a layer4 tunnel if you don’t run a proxy on your home box, you’ll need a new network connection for each service, if you are fine with that, I would set it up only on the VPS. This means if the tunnel goes down, you should at least get 502 error rather than a timeout or connection refused.

Alternatively you could forward 80, 443 to a proxy service on the home server. That would require two ports for the ssh.

You can drop it to a single ssh connection by having a proxy on both and just have the VPS proxy Http and https to the same port on the home server.

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just_another_person@lemmy.world ⁨6⁩ ⁨months⁩ ago
Firstly…why are you routing your home stuff through a VPS? I’m confused on what is happening here.

If you just want to access your things remotely, setup a VPN server on the router, and connect to it that way. You also need need a reverse proxy or SSL. Where did you get this from?

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- Felix_lm22@sopuli.xyz ⁨6⁩ ⁨months⁩ ago
  Please read the post man, all VPNs are blocked on the protocol level
  
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  - refalo@programming.dev ⁨6⁩ ⁨months⁩ ago
    That’s not how VPNs work, you can’t just “block all of them”. I think OP just needs to use a pure-TLS VPN solution (like SoftEther) or an obfuscated one like shadowsocks/obfs from a not-super-well-known provider (or self-host it on a VPS/etc.) and they should be golden.
    
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  - just_another_person@lemmy.world ⁨6⁩ ⁨months⁩ ago
    That was added later, obviously. Even still, you don’t need a VPS for this. This is overly complex.
    
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