Hi folks, I’m just getting into this hobby thanks to the posts in this community. So far, I’ve installed Ubuntu server 22.04 on an old laptop and got paperless working, and I’m pretty pumped. Now I would like to access it outside of my home network on my phone.
I have a Netgear R7000 with Advanced Tomato installed. Here’s my plan, but I don’t know if it would work… So I’m hoping for a peer review of sorts.
- Get openVPN working on the router as a server.
- make a certificate for my phone and use it as a client.
- use my fedora laptop as the CA (?).
I think I need to use easy-RDA to make the keys and certificates…
Does that sound about right? It’s this a good approach or is there something better/easier/more effective?
If there’s a great tutorial around for accessing the home network externally, I’d super appreciate it. Would obviously prefer to do it myself and not pay for a service… I’ve been enjoying the learning experience!
I’ll pitch ZeroTier instead, it’s the same concept, but it’s more FOSS friendly, older, doesn’t have the non-networking “feature bloat” of Tailscale, and can handle some really niche cases like Ethernet bridging (should you ever care).
Just:
If you want to go full self hosting, you can do that too but you will need something with a static IP to control everything (https://docs.zerotier.com/self-hosting/network-controllers/?utm_source=ztp) this would replace the web panel parts.
You can also do a LAN routing based solution pretty easily using something like a Raspberry Pi (or really any Linux computer).
How secure is zerotier in your opinion?
I think it’s pretty secure and it will be getting better soon. In reality, I think it’s much more secure than what most people will end up with otherwise.
ZeroTier is open source, long running without incident, and the traffic is encrypted between peers.
The threat model is basically two fold though, in theory someone who has control of the ZeroTier roots (if you’re not using your own controller, if you’re using your own, then s/their roots/your roots/) could add routes to your devices, and add/remove devices that are part of your confirmation.
The encryption also doesn’t currently have perfect forward security, so if there’s a compromise in one of your connections, in theory some past state of that connection could be decrypted. In practice, I’m not sure this matters as traffic at a higher level for most sensitive things uses its own encryption and perfect forward security (but hey maybe you have some software that doesn’t).
The other thing I will note about that last point is that they’re working on a rust rewrite that will have updated crypto, including perfect forward security.
Thank you for the write up! Very helpful.
The use case I was wondering about is batch printing from a cloud solution. The print batch files could be encrypted, but I work with multiple solutions and I’m not confident that all of them encrypt those files. If it’s possible to crack old batches, that could expose sensitive information.
If you send these files over SSH, you’re good as that’s encrypted by ZeroTier and then encrypted again inside the SSH connection (and SSH does have perfect forward security).
See their cryptography section of their docs for more info.
You can read more here about what they’re working on:
It’s been to long since I’ve read that to give anything more than a condensed “they’re improving their crypto significantly with ZeroTier 2” (not to mention memory safety via Rust).
This is a very good read https://blog.reconinfosec.com/locking-down-zerotier
TLDR: Used at hacker conference Defcon 26 in a blue team (defense team) capture the flag.
How is it FOSS if they are asking you for a login? If traffic from your devices even touches their servers, you don’t know what is happening with it, and the entire process turns into a black box
FOSS just means the software is open source. As I said, you can self host ZeroTier and not involve their servers (if you’re not doing things commercially, you pay for the license but still run your own controllers, or you use an older version which has been automatically relicensed by the change date to Apache 2.0).
That said, the traffic is peer-to-peer, in the majority of use cases there servers are acting as a bit more than syncthing’s servers (acting to facilitate the connection between two devices that want to talk together). See the other comment for some more thoughts here.