oldaccountdeadname / stlsc.nix

sacrificial tls certificates for nix

stlsc.nix

a sacrificial tls certificate packaged as a nix flake

usage

Recommended: stlsc.nix is available as a Flake, which you can wire up to your build system. If, however, you just need a one-off cert, you can download one (and all other associated information) from the most recent build artifacts.

For a complete example, see the devShell of systemgmi:

https://github.com/lincolnauster/systemgmi/blob/dev/flake.nix#L29

usage as an expression

stlsc.nix/flake.nix contains two primary outputs: defaultPackage.$system, and customCert.$system. Using the latter looks like this:

{
  out = stlsc.customCert.x86_64-linux {
    country = "US";
    state   = "NA";
    city    = "NA";
    org     = "help i'm trapped in a TLS cert factory";
    orgunit = "help";
    fqdn    = "example.com";
    email   = "[email protected]";
    pass    = "hunter2";
  };
}

Note that this requires supplying the password in plain text. If this bothers you, you probably shouldn't be using a sacrificial TLS cert. The defaultPackage output does exactly the same thing, but with slightly different default options (see all of them in flake.nix).

Outputs are as follows:

|               path | value                                       |
|--------------------|---------------------------------------------|
| `$out/pass`        | the password you set during creation        |
| `$out/privkey.pem` | the generated private key                   |
| `$out/privkey.pem` | the generated private key                   |
| `$out/tlscert.pem` | the generate self-signed tls cert           |
| `$out/tlscert.pfx` | PKCS#12 export of both the key and the cert |

security

no :). everything, including passwords and private keys, are written in plain text and world-readable in the nix store. this is called sacrifcial for a reason, and is just for spinning up quick development environments where a TLS certificate is a requirement but a good one is not.

todos

• set up automated updating
• set up automated testing
• seeding the generation for determinism?
• allow creation of certs with no passwords
• docs:
  • put an example here
  • document the output files in result/