diff options
Diffstat (limited to 'nixos/modules/services/networking/rosenpass.nix')
| -rw-r--r-- | nixos/modules/services/networking/rosenpass.nix | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/nixos/modules/services/networking/rosenpass.nix b/nixos/modules/services/networking/rosenpass.nix new file mode 100644 index 00000000000..d2a264b83d6 --- /dev/null +++ b/nixos/modules/services/networking/rosenpass.nix @@ -0,0 +1,233 @@ +{ config +, lib +, options +, pkgs +, ... +}: +let + inherit (lib) + attrValues + concatLines + concatMap + filter + filterAttrsRecursive + flatten + getExe + mdDoc + mkIf + optional + ; + + cfg = config.services.rosenpass; + opt = options.services.rosenpass; + settingsFormat = pkgs.formats.toml { }; +in +{ + options.services.rosenpass = + let + inherit (lib) + literalExpression + mdDoc + mkOption + ; + inherit (lib.types) + enum + listOf + nullOr + path + str + submodule + ; + in + { + enable = lib.mkEnableOption (mdDoc "Rosenpass"); + + package = lib.mkPackageOption pkgs "rosenpass" { }; + + defaultDevice = mkOption { + type = nullOr str; + description = mdDoc "Name of the network interface to use for all peers by default."; + example = "wg0"; + }; + + settings = mkOption { + type = submodule { + freeformType = settingsFormat.type; + + options = { + public_key = mkOption { + type = path; + description = mdDoc "Path to a file containing the public key of the local Rosenpass peer. Generate this by running {command}`rosenpass gen-keys`."; + }; + + secret_key = mkOption { + type = path; + description = mdDoc "Path to a file containing the secret key of the local Rosenpass peer. Generate this by running {command}`rosenpass gen-keys`."; + }; + + listen = mkOption { + type = listOf str; + description = mdDoc "List of local endpoints to listen for connections."; + default = [ ]; + example = literalExpression "[ \"0.0.0.0:10000\" ]"; + }; + + verbosity = mkOption { + type = enum [ "Verbose" "Quiet" ]; + default = "Quiet"; + description = mdDoc "Verbosity of output produced by the service."; + }; + + peers = + let + peer = submodule { + freeformType = settingsFormat.type; + + options = { + public_key = mkOption { + type = path; + description = mdDoc "Path to a file containing the public key of the remote Rosenpass peer."; + }; + + endpoint = mkOption { + type = nullOr str; + default = null; + description = mdDoc "Endpoint of the remote Rosenpass peer."; + }; + + device = mkOption { + type = str; + default = cfg.defaultDevice; + defaultText = literalExpression "config.${opt.defaultDevice}"; + description = mdDoc "Name of the local WireGuard interface to use for this peer."; + }; + + peer = mkOption { + type = str; + description = mdDoc "WireGuard public key corresponding to the remote Rosenpass peer."; + }; + }; + }; + in + mkOption { + type = listOf peer; + description = mdDoc "List of peers to exchange keys with."; + default = [ ]; + }; + }; + }; + default = { }; + description = mdDoc "Configuration for Rosenpass, see <https://rosenpass.eu/> for further information."; + }; + }; + + config = mkIf cfg.enable { + warnings = + let + # NOTE: In the descriptions below, we tried to refer to e.g. + # options.systemd.network.netdevs."<name>".wireguardPeers.*.PublicKey + # directly, but don't know how to traverse "<name>" and * in this path. + extractions = [ + { + relevant = config.systemd.network.enable; + root = config.systemd.network.netdevs; + peer = (x: x.wireguardPeers); + key = (x: if x.wireguardPeerConfig ? PublicKey then x.wireguardPeerConfig.PublicKey else null); + description = mdDoc "${options.systemd.network.netdevs}.\"<name>\".wireguardPeers.*.wireguardPeerConfig.PublicKey"; + } + { + relevant = config.networking.wireguard.enable; + root = config.networking.wireguard.interfaces; + peer = (x: x.peers); + key = (x: x.publicKey); + description = mdDoc "${options.networking.wireguard.interfaces}.\"<name>\".peers.*.publicKey"; + } + rec { + relevant = root != { }; + root = config.networking.wg-quick.interfaces; + peer = (x: x.peers); + key = (x: x.publicKey); + description = mdDoc "${options.networking.wg-quick.interfaces}.\"<name>\".peers.*.publicKey"; + } + ]; + relevantExtractions = filter (x: x.relevant) extractions; + extract = { root, peer, key, ... }: + filter (x: x != null) (flatten (concatMap (x: (map key (peer x))) (attrValues root))); + configuredKeys = flatten (map extract relevantExtractions); + itemize = xs: concatLines (map (x: " - ${x}") xs); + descriptions = map (x: "`${x.description}`"); + missingKeys = filter (key: !builtins.elem key configuredKeys) (map (x: x.peer) cfg.settings.peers); + unusual = '' + While this may work as expected, e.g. you want to manually configure WireGuard, + such a scenario is unusual. Please double-check your configuration. + ''; + in + (optional (relevantExtractions != [ ] && missingKeys != [ ]) '' + You have configured Rosenpass peers with the WireGuard public keys: + ${itemize missingKeys} + But there is no corresponding active Wireguard peer configuration in any of: + ${itemize (descriptions relevantExtractions)} + ${unusual} + '') + ++ + optional (relevantExtractions == [ ]) '' + You have configured Rosenpass, but you have not configured Wireguard via any of: + ${itemize (descriptions extractions)} + ${unusual} + ''; + + environment.systemPackages = [ cfg.package pkgs.wireguard-tools ]; + + systemd.services.rosenpass = + let + filterNonNull = filterAttrsRecursive (_: v: v != null); + config = settingsFormat.generate "config.toml" ( + filterNonNull (cfg.settings + // + ( + let + credentialPath = id: "$CREDENTIALS_DIRECTORY/${id}"; + # NOTE: We would like to remove all `null` values inside `cfg.settings` + # recursively, since `settingsFormat.generate` cannot handle `null`. + # This would require to traverse both attribute sets and lists recursively. + # `filterAttrsRecursive` only recurses into attribute sets, but not + # into values that might contain other attribute sets (such as lists, + # e.g. `cfg.settings.peers`). Here, we just specialize on `cfg.settings.peers`, + # and this may break unexpectedly whenever a `null` value is contained + # in a list in `cfg.settings`, other than `cfg.settings.peers`. + peersWithoutNulls = map filterNonNull cfg.settings.peers; + in + { + secret_key = credentialPath "pqsk"; + public_key = credentialPath "pqpk"; + peers = peersWithoutNulls; + } + ) + ) + ); + in + rec { + wantedBy = [ "multi-user.target" ]; + after = [ "network-online.target" ]; + path = [ cfg.package pkgs.wireguard-tools ]; + + serviceConfig = { + User = "rosenpass"; + Group = "rosenpass"; + RuntimeDirectory = "rosenpass"; + DynamicUser = true; + AmbientCapabilities = [ "CAP_NET_ADMIN" ]; + LoadCredential = [ + "pqsk:${cfg.settings.secret_key}" + "pqpk:${cfg.settings.public_key}" + ]; + }; + + # See <https://www.freedesktop.org/software/systemd/man/systemd.unit.html#Specifiers> + environment.CONFIG = "%t/${serviceConfig.RuntimeDirectory}/config.toml"; + + preStart = "${getExe pkgs.envsubst} -i ${config} -o \"$CONFIG\""; + script = "rosenpass exchange-config \"$CONFIG\""; + }; + }; +} |