this post was submitted on 11 Mar 2024
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13
Self hosted syncthing relay with keepass, how secure is it? (self.selfhosted)
submitted 8 months ago by kugmo to c/[email protected]
9 comments fedilink hide all child comments
 

I already have my keepassxc and syncthing setup on my phone and computers and it's great, I'd like to go a step further and have my password database sync when I'm not on my home network. From my understanding I can use relays set up by other users and they are encrypted, but if I do not trust syncing personal (encrypted) data to someone else's server how easy is it to set up a relay that only I use? I won't be using Bitwarden because in theory if I can pull this off I can also use syncthing to sync other files as well. Is setting up a personal relay a lot of work or a potential security risk for my home network?

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[–] [email protected] 4 points 8 months ago* (last edited 8 months ago) (1 children)

Is setting up a personal relay a lot of work or a potential security risk for my home network?

Where are you planning to host the relay?

Either way, here's how to setup a relay and here how to configure clients to use your relay.

[–] kugmo 1 points 8 months ago (1 children)

At my house, I'm already using a dynamic dns for some game servers because of a dynamic ip.

[–] [email protected] 5 points 8 months ago* (last edited 8 months ago)

If you can create a port forward in your router and run stuff at your house what's the point of a relay then? Just expose the ports that Syncthing uses and configure your client to connect to it using your dynamic DNS. No public or private relays are required.

  1. Port forward the following in your router to the local Syncthing host, any client will be able to connect to it directly:
  • Port 22000/TCP: TCP based sync protocol traffic
  • Port 22000/UDP: QUIC based sync protocol traffic
  1. Go into the client and edit the home device. Set it to connect using the dynamic DNS directly:

For extra security you may change the Syncthing port, or run the entire thing over a Wireguard VPN like I also do.

Note that even without the VPN all traffic is TLS protected.

[–] [email protected] 4 points 8 months ago

So you do not trust the syncthing encryption when it goes through someones server but when it goes through someones (your ISP and the ISP of the end device) router/server?

I am not really understanding the thread model here.

[–] [email protected] 2 points 8 months ago (1 children)

Syncthing is p2p. The servers only see your devices IP addresses and let them connect to share data themselves. That's why it's a relay. But AFAIK files only goes from, and to, your syncthing clients; without passing through the relays. At most, the relay may see some metadata as filenames. I have been syncing passwords like this since long ago. Never jumped to Bitwarden because I didn't had the need... May do so anyway because of OTP and Passkeys..

[–] [email protected] 2 points 8 months ago

Oh, and the syncthing encryption that you may enable for the folders is for these devices/ clients. This may be useful is you were to use a third part machine, like a VPS, as a 24/ 7 node for your files. That's different from a relay, may be desirable if you want to sync ASAP and avoid conflicts. In any case, conflicts are rare.. you would need to open the DB and add entries at the same time, or some quirky scenario...

[–] [email protected] 2 points 8 months ago (1 children)

Personally, I've just set my devices to only sync in my LAN, just in case.

[–] [email protected] 1 points 8 months ago

I use it over Tailscale only and it works perfectly as an alternative.

[–] [email protected] 1 points 8 months ago* (last edited 8 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
IP Internet Protocol
SSL Secure Sockets Layer, for transparent encryption
TCP Transmission Control Protocol, most often over IP
TLS Transport Layer Security, supersedes SSL
UDP User Datagram Protocol, for real-time communications
VPN Virtual Private Network
VPS Virtual Private Server (opposed to shared hosting)

6 acronyms in this thread; the most compressed thread commented on today has 10 acronyms.

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