nixpkgs/nixos/modules/services/security/vault.nix

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{ config, lib, pkgs, ... }:
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with lib;
let
cfg = config.services.vault;
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configFile = pkgs.writeText "vault.hcl" ''
listener "tcp" {
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address = "${cfg.address}"
${if (cfg.tlsCertFile == null || cfg.tlsKeyFile == null) then ''
tls_disable = "true"
'' else ''
tls_cert_file = "${cfg.tlsCertFile}"
tls_key_file = "${cfg.tlsKeyFile}"
''}
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${cfg.listenerExtraConfig}
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}
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storage "${cfg.storageBackend}" {
${optionalString (cfg.storagePath != null) ''path = "${cfg.storagePath}"''}
${optionalString (cfg.storageConfig != null) cfg.storageConfig}
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}
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${optionalString (cfg.telemetryConfig != "") ''
telemetry {
${cfg.telemetryConfig}
}
''}
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'';
in
{
options = {
services.vault = {
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enable = mkEnableOption "Vault daemon";
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address = mkOption {
type = types.str;
default = "127.0.0.1:8200";
description = "The name of the ip interface to listen to";
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};
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tlsCertFile = mkOption {
type = types.nullOr types.str;
default = null;
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example = "/path/to/your/cert.pem";
description = "TLS certificate file. TLS will be disabled unless this option is set";
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};
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tlsKeyFile = mkOption {
type = types.nullOr types.str;
default = null;
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example = "/path/to/your/key.pem";
description = "TLS private key file. TLS will be disabled unless this option is set";
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};
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listenerExtraConfig = mkOption {
type = types.lines;
default = ''
tls_min_version = "tls12"
'';
description = "extra configuration";
};
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storageBackend = mkOption {
type = types.enum [ "inmem" "file" "consul" "zookeeper" "s3" "azure" "dynamodb" "etcd" "mssql" "mysql" "postgresql" "swift" "gcs" ];
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default = "inmem";
description = "The name of the type of storage backend";
};
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storagePath = mkOption {
type = types.nullOr types.path;
default = if cfg.storageBackend == "file" then "/var/lib/vault" else null;
description = "Data directory for file backend";
};
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storageConfig = mkOption {
type = types.nullOr types.lines;
default = null;
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description = "Storage configuration";
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};
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telemetryConfig = mkOption {
type = types.lines;
default = "";
description = "Telemetry configuration";
};
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};
};
config = mkIf cfg.enable {
assertions = [
{ assertion = cfg.storageBackend == "inmem" -> (cfg.storagePath == null && cfg.storageConfig == null);
message = ''The "inmem" storage expects no services.vault.storagePath nor services.vault.storageConfig'';
}
{ assertion = (cfg.storageBackend == "file" -> (cfg.storagePath != null && cfg.storageConfig == null)) && (cfg.storagePath != null -> cfg.storageBackend == "file");
message = ''You must set services.vault.storagePath only when using the "file" backend'';
}
];
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users.extraUsers.vault = {
name = "vault";
group = "vault";
uid = config.ids.uids.vault;
description = "Vault daemon user";
};
users.extraGroups.vault.gid = config.ids.gids.vault;
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systemd.services.vault = {
description = "Vault server daemon";
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wantedBy = ["multi-user.target"];
after = [ "network.target" ]
++ optional (config.services.consul.enable && cfg.storageBackend == "consul") "consul.service";
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restartIfChanged = false; # do not restart on "nixos-rebuild switch". It would seal the storage and disrupt the clients.
preStart = optionalString (cfg.storagePath != null) ''
install -d -m0700 -o vault -g vault "${cfg.storagePath}"
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'';
serviceConfig = {
User = "vault";
Group = "vault";
PermissionsStartOnly = true;
ExecStart = "${pkgs.vault}/bin/vault server -config ${configFile}";
PrivateDevices = true;
PrivateTmp = true;
ProtectSystem = "full";
ProtectHome = "read-only";
AmbientCapabilities = "cap_ipc_lock";
NoNewPrivileges = true;
KillSignal = "SIGINT";
TimeoutStopSec = "30s";
Restart = "on-failure";
StartLimitInterval = "60s";
StartLimitBurst = 3;
};
unitConfig.RequiresMountsFor = optional (cfg.storagePath != null) cfg.storagePath;
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};
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};
}