!XLCFfvFhUkYwOMLbVx:nixos.org

agenix

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age-encrypted secrets for NixOS https://github.com/ryantm/agenix/96 Servers

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10 Mar 2025
@charles:computer.surgeryCharles left the room.22:30:10
12 Mar 2025
@xoredg:matrix.orgxored Hi everyone, I've been trying to use the path option to decrypt a secret to $home/.config/ntfy/client.yaml, but is not working, my best guess is that is not being evaluated? 02:53:43
@elikoga:matrix.orgelikoga Are you using straight up "$home"? Either that's not evaluated or placed at the home of the agenix activation script user (probably root?) 02:56:11
@xoredg:matrix.orgxored No I am using an interpolated string 02:56:48
@xoredg:matrix.orgxored put that to save typing hahaha 02:57:07
@xoredg:matrix.orgxored oh for the love of god, it was wrong name in cfg = config.modulename that i pasted from another file 02:59:13
@xoredg:matrix.orgxoredno wonder it did not eval02:59:23
16 Mar 2025
@memyk:matrix.orgmemyk joined the room.12:38:26
18 Mar 2025
@raijin_:matrix.org@raijin_:matrix.org

I'm a little confused on how I use Agenix secrets with multiple machines?

I have Agenix set up on machine A, and a key on machine A was used to create/encrypt the secrets

I installed NixOS on machine B, and I have generated a new keypair to belong to this machine.

If I add my new public key to secrets.nix, and I designate that this key can read a given secret in .publicKeys, will this work?

I'm struggling to see how a malicious actor couldn't just download the repo, add their keys, and decrypt? The "original" key (on machine A) has to be used to decrypt at some point right? What am I missing here? Do I just have to share the same keypair across machines? Obviously not, or else why can we configure multiple?

22:47:03
19 Mar 2025
@k900:0upti.meK900You need to rekey your secrets manually on a machine that can decrypt them 00:34:28
@raijin_:matrix.org@raijin_:matrix.org K900: ok, this enables the secrets to be read by multiple users? 01:51:37
@raijin_:matrix.org@raijin_:matrix.orgis https://github.com/oddlama/agenix-rekey recommended?02:00:16
@k900:0upti.meK900
In reply to @raijin_:matrix.org
is https://github.com/oddlama/agenix-rekey recommended?
Not necessarily, depends on your setup
06:45:41
@raijin_:matrix.org@raijin_:matrix.org

K900: this is my current secrets "architecture" https://github.com/GideonWolfe/nix/tree/main/configs/secrets

I did some reorganizing to separate system/user secrets, but I'm not sure how to really make the whole process "seamless" to set up a new machine

15:25:22
20 Mar 2025
@rane:junkyard.systemsrane [they/them] raijin_: you'll need the private key for a public key which has "access" to a given age/agenix secret to be able to decrypt it, public key just allows for encryption not decryption. So for example, my workflow is that all secrets can be decrypted by the SSH private keys of machines which need them, and also my yubikey's age key (which is stored on the yubikey and has to be plugged in). If I want to add a new host, I do an ssh-keyscan to get the public key, add it to my list of identies, and then rekey everything. My yubikey is sufficient to rekey because if it is plugged in then I have access to a private key which can decrypt the secrets. Does that make sense? 20:23:07
@rane:junkyard.systemsrane [they/them]You set out what has access to which secrets in the secrets.nix file and you can lock it down to just your private key (which can be on a yubikey) and just the SSH private keys of the machines which need access to those secrets. The SSH private keys stay on those machines so an attacker would already have to have access to those machines with sufficient access to read just the secrets you were using on that machine or the SSH private key (which is usually only accessible to root). But if they had root on your machine, or access as a service account where you'd configured the permissions on a secret to be readable by the service, on the target machine, they'd be able to read the secret. But in most threat models that would be expected and acceptable, if someone is already on the machine then at least you're able to limit and restrict the secrets to just what is needed for each given service + user.20:25:45
@rane:junkyard.systemsrane [they/them] I just have agenix -r with the appropriate identity for my yubikey age key in a Makefile I run when I need to rekey everything (i.e. add a new host's SSH public key) 20:27:04
@Valodim:stratum0.orgValodimSetting a different default private key location via environment is one thing I miss in agenix from sops20:28:32
21 Mar 2025
@adjivas:matrix.orgadjivas joined the room.01:50:53
22 Mar 2025
@isabel:isabelroses.comisabel joined the room.00:42:36

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