Restructure folders, add mail host

The entire file structure has been reorganised into stable and unstable
to separate deployments running on either channel. A `mail` host running
Simple Nix Mailserver has also been added for testing to see if it's a
good alternative to soverin as well as SMTP for other services.

stable/config/common/services/nginx.nix

@@ -0,0 +1,43 @@
+{ ... }:
+{
+    services.nginx = {
+    #enable = true;
+
+    # Use recommended settings
+    recommendedGzipSettings = true;
+    recommendedOptimisation = true;
+    recommendedProxySettings = true;
+    recommendedTlsSettings = true;
+
+    # Only allow PFS-enabled ciphers with AES256
+    sslCiphers = "ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384";
+
+    commonHttpConfig = ''
+      # Add HSTS header with preloading to HTTPS requests.
+      # Adding this header to HTTP requests is discouraged
+      map $scheme $hsts_header {
+          https   "max-age=31536000; includeSubdomains; preload";
+      }
+      add_header Strict-Transport-Security $hsts_header;
+
+      # Enable CSP for your services.
+      #add_header Content-Security-Policy "script-src 'self'; object-src 'none'; base-uri 'none';" always;
+
+      # Minimize information leaked to other domains
+      add_header 'Referrer-Policy' 'origin-when-cross-origin';
+
+      # Disable embedding as a frame
+      add_header X-Frame-Options DENY;
+
+      # Prevent injection of code in other mime types (XSS Attacks)
+      add_header X-Content-Type-Options nosniff;
+
+      # Enable XSS protection of the browser.
+      # May be unnecessary when CSP is configured properly (see above)
+      add_header X-XSS-Protection "1; mode=block";
+
+      # This might create errors
+      proxy_cookie_path / "/; secure; HttpOnly; SameSite=strict";
+    '';
+  };
+}

stable/config/hosts/mail/configuration.nix

@@ -0,0 +1,58 @@
+{ config, pkgs, lib, ... }:
+
+{
+  imports = [ 
+    ./hardware-configuration.nix 
+    ../../common/services/ssh.nix
+    #./services/restic.nix
+    ./services/mail.nix
+    ./services/acme.nix
+    ./data/secrets/secrets.nix
+    ];
+
+  boot.loader.grub.enable = true;
+  boot.loader.grub.version = 2;
+  boot.loader.grub.device = "/dev/sda";
+  boot.supportedFilesystems = ["zfs"];
+  services.zfs.autoSnapshot.enable = true;
+  services.zfs.autoScrub.enable = true;
+
+  networking.hostName = "mail";
+  networking.hostId = "1e04e84b";
+  time.timeZone = "Europe/Copenhagen";
+  networking.useDHCP = false;
+  networking.interfaces.ens3.useDHCP = true;
+  networking.interfaces.ens3.ipv6.addresses = [ { address = "2a01:4f9:c010:624a::1"; prefixLength = 64; } ];
+  networking.defaultGateway6 = { address = "fe80::1"; interface = "ens3"; };
+
+  users.users.emelie = {
+    isNormalUser = true;
+    extraGroups = [ "wheel" ];
+    openssh.authorizedKeys.keys = [
+      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICO4LyBsW1YuUA6i3EL/IZhchSvk7reO4qgRmR/tdQPU emelie@flap"
+    ];
+  };
+
+  security.sudo.wheelNeedsPassword = false;
+
+  environment.systemPackages = with pkgs; [
+    vim
+    htop
+    iotop
+    dig
+  ];
+
+  nix = {
+    autoOptimiseStore = true;
+    trustedUsers = [
+      "root"
+      "@wheel"
+    ];
+  };
+
+
+  # Use hetzner firewall instead
+  networking.firewall.enable = false;
+  system.stateVersion = "21.05";
+
+}

stable/config/hosts/mail/hardware-configuration.nix

@@ -0,0 +1,41 @@
+# Do not modify this file!  It was generated by ‘nixos-generate-config’
+# and may be overwritten by future invocations.  Please make changes
+# to /etc/nixos/configuration.nix instead.
+{ config, lib, pkgs, modulesPath, ... }:
+
+{
+  imports =
+    [ (modulesPath + "/profiles/qemu-guest.nix")
+      (modulesPath + "/profiles/minimal.nix")
+    ];
+
+  boot.initrd.availableKernelModules = [ "ata_piix" "virtio_pci" "virtio_scsi" "xhci_pci" "sd_mod" "sr_mod" ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ ];
+  boot.extraModulePackages = [ ];
+
+  fileSystems."/" =
+    { device = "rpool/safe/root";
+      fsType = "zfs";
+    };
+
+  fileSystems."/home" =
+    { device = "rpool/safe/home";
+      fsType = "zfs";
+    };
+
+  fileSystems."/var" =
+    { device = "rpool/safe/var";
+      fsType = "zfs";
+    };
+
+  fileSystems."/nix" =
+    { device = "rpool/local/nix";
+      fsType = "zfs";
+    };
+
+  swapDevices =
+    [ { device = "/dev/disk/by-uuid/9c3c66f5-bf5a-4a2a-88a2-fc2ef312d7ef"; }
+    ];
+
+}

stable/config/hosts/mail/services/mail.nix

@@ -0,0 +1,25 @@
+{ config, ... }:
+
+{
+  imports = [
+    (builtins.fetchTarball {
+      # Pick a commit from the branch you are interested in
+      url = "https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/archive/5675b122a947b40e551438df6a623efad19fd2e7/nixos-mailserver-5675b122a947b40e551438df6a623efad19fd2e7.tar.gz";
+      # And set its hash
+      sha256 = "1fwhb7a5v9c98nzhf3dyqf3a5ianqh7k50zizj8v5nmj3blxw4pi";
+    })
+  ];
+
+  mailserver = {
+    enable = true;
+    fqdn = "mail.graven.dev";
+    domains = [ "anarkafem.dev" ];
+
+    loginAccounts = {
+      "noreply@anarkafem.dev" = {
+        hashedPasswordFile = config.secrets.files.mail_noreply_anarkafem_dev.file;
+      };
+    };
+    certificateScheme = 3;
+  };
+}

stable/config/sources/nix/sources.json

@@ -0,0 +1,50 @@
+{
+    "niv": {
+        "branch": "master",
+        "description": "Easy dependency management for Nix projects",
+        "homepage": "https://github.com/nmattia/niv",
+        "owner": "nmattia",
+        "repo": "niv",
+        "rev": "5830a4dd348d77e39a0f3c4c762ff2663b602d4c",
+        "sha256": "1d3lsrqvci4qz2hwjrcnd8h5vfkg8aypq3sjd4g3izbc8frwz5sm",
+        "type": "tarball",
+        "url": "https://github.com/nmattia/niv/archive/5830a4dd348d77e39a0f3c4c762ff2663b602d4c.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    },
+    "nixos-hardware": {
+        "branch": "master",
+        "description": "A collection of NixOS modules covering hardware quirks.",
+        "homepage": "",
+        "owner": "NixOS",
+        "repo": "nixos-hardware",
+        "rev": "5a7e613703ea349fd46b3fa2f3dfe3bd5444d591",
+        "sha256": "088z9p9ycsvnghqbksxrssk43wfsnm9caks9lch90jp2x8c8aw7x",
+        "type": "tarball",
+        "url": "https://github.com/NixOS/nixos-hardware/archive/5a7e613703ea349fd46b3fa2f3dfe3bd5444d591.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    },
+    "nixpkgs": {
+        "branch": "nixos-21.05",
+        "description": "Nix Packages collection",
+        "homepage": "",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "46251a79f752ae1d46ef733e8e9760b6d3429da4",
+        "sha256": "1xsp0xyrf8arjkf4wi09n96kbg0r8igsmzx8bhc1nj4nr078p0pg",
+        "type": "tarball",
+        "url": "https://github.com/NixOS/nixpkgs/archive/46251a79f752ae1d46ef733e8e9760b6d3429da4.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    },
+    "nixus": {
+        "branch": "master",
+        "description": null,
+        "homepage": "",
+        "owner": "Infinisil",
+        "repo": "nixus",
+        "rev": "851b6b7480815afd0032fd15ebcf23e80e1d7e57",
+        "sha256": "1vr39sa7gldwkkhcq70ki878zgnj9z4gvwg85asi2mai0x47f3lb",
+        "type": "tarball",
+        "url": "https://github.com/Infinisil/nixus/archive/851b6b7480815afd0032fd15ebcf23e80e1d7e57.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    }
+}

stable/deploy/default.nix

@@ -0,0 +1,24 @@
+let
+  sources = import ../config/sources;
+in import "${sources.nixus}" {} ({ config, ... }: {
+
+  defaults = { name, ... }: {
+    configuration = { lib, ... }: {
+      networking.hostName = lib.mkDefault name;
+    };
+
+    # use our nixpkgs from niv
+    nixpkgs = sources.nixpkgs;
+  };
+
+  nodes = {
+    mail = { lib, config, ... }: {
+      host = "emelie@mail.graven.dev";
+      configuration = ../config/hosts/mail/configuration.nix;
+      switchTimeout = 300;
+      successTimeout = 300;
+      #ignoreFailingSystemdUnits = true;
+    };
+  };
+})
+

stable/result

@@ -0,0 +1 @@
+/nix/store/i50n7iakdlfmy4s7d90djnz30q4qskh5-deploy

unstable/config/common/data/pubkeys/despondos_host_ed25519_key.pub

@@ -0,0 +1 @@
+ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIH+ZQk80BU/OdQfV990yrkFwvsLVbVZ2Itof/qwxjTn7

unstable/config/common/services/ssh.nix

@@ -0,0 +1,24 @@
+{ ... }:
+{
+  services.openssh = {
+    enable = true;
+    permitRootLogin = "no";
+    passwordAuthentication = false;
+    challengeResponseAuthentication = false;
+    hostKeys = [ { "path" = "/etc/ssh/ssh_host_ed25519_key"; "type" = "ed25519"; } ];
+    kexAlgorithms = [ "curve25519-sha256" "curve25519-sha256@libssh.org" ];
+    macs = [ "hmac-sha2-512-etm@openssh.com" "hmac-sha2-512-etm@openssh.com" "umac-128-etm@openssh.com" ];
+  };
+
+  programs.ssh.knownHosts = {
+    despondos = {
+      hostNames = [ "despondos.nao.sh" ];
+      publicKeyFile = ../data/pubkeys/despondos_host_ed25519_key.pub;
+    };
+  };
+
+  services.sshguard = {
+    enable = true;
+    blocktime = 300;
+  };
+}

unstable/config/hosts/grondahl/configuration.nix

@@ -12,6 +12,7 @@
     ./services/restic.nix
     ./services/synapse.nix
     ./services/postgres.nix
+    ./services/mail.nix
     ];
 
   boot.loader.grub.enable = true;

unstable/config/hosts/grondahl/services/mail.nix

@@ -0,0 +1,25 @@
+{ config, ... }:
+{
+  imports = [
+    (builtins.fetchTarball {
+      # Pick a commit from the branch you are interested in
+      url = "https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/archive/6e8142862f23ab99e1cc57838c02b733361e8d50/nixos-mailserver-6e8142862f23ab99e1cc57838c02b733361e8d50.tar.gz";
+      # And set its hash
+      sha256 = "19qzp8131pid4m3llb6w2v4ayxh25016fpv8yw6wnqng9yvigcw5";
+    })
+  ];
+
+  mailserver = {
+    enable = true;
+    fqdn = "anarkafem.dev";
+    domains = [ "anarkafem.dev" ];
+    loginAccounts = {
+      "noreply@anarkafem.dev" = {
+        hashedPasswordFile = config.secrets.files.email_noreply.file;
+
+      };
+    };
+    certificateScheme = 3;
+  };
+}
+

unstable/config/hosts/rudiger/services/acme.nix

@@ -0,0 +1,9 @@
+{ config, ... }:
+
+{
+  security.acme = {
+    acceptTerms = true;
+    email = "admin+certs@graven.dev";
+  };
+}
+

unstable/config/hosts/wind/services/restic.nix

@@ -0,0 +1,47 @@
+{ config, ... }:
+
+{
+
+  services.restic.backups = {
+    "gitea" = {
+      paths = [ "/var/lib/gitea" ];
+      repository = "sftp:restic@despondos.nao.sh:/etheria/backup/wind/gitea";
+      initialize = true;
+      pruneOpts = [ "--keep-daily 7" "--keep-weekly 5" "--keep-monthly 12" "--keep-yearly 75" ];
+      timerConfig = { "OnCalendar" = "02:15"; };
+      extraOptions = [ "sftp.command='ssh restic@despondos.nao.sh -i ${config.secrets.files.ssh_key.file} -s sftp'" ];
+      passwordFile = builtins.toString config.secrets.files.restic_pass.file;
+      user = "gitea";
+    };
+    "postgres" = {
+      paths = [ "/var/lib/postgresql/backup" ];
+      repository = "sftp:restic@despondos.nao.sh:/etheria/backup/wind/postgres";
+      initialize = true;
+      pruneOpts = [ "--keep-daily 7" "--keep-weekly 5" "--keep-monthly 12" "--keep-yearly 75" ];
+      timerConfig = { "OnCalendar" = "03:00"; };
+      extraOptions = [ "sftp.command='ssh restic@despondos.nao.sh -i ${config.secrets.files.ssh_key.file} -s sftp'" ];
+      passwordFile = builtins.toString config.secrets.files.restic_pass.file;
+      user = "postgres";
+    };
+    "synapse" = {
+      paths = [ "/var/lib/matrix-synapse" ];
+      repository = "sftp:restic@despondos.nao.sh:/etheria/backup/wind/synapse";
+      initialize = true;
+      pruneOpts = [ "--keep-daily 7" "--keep-weekly 5" "--keep-monthly 12" "--keep-yearly 75" ];
+      timerConfig = { "OnCalendar" = "03:30"; };
+      extraOptions = [ "sftp.command='ssh restic@despondos.nao.sh -i ${config.secrets.files.ssh_key.file} -s sftp'" ];
+      passwordFile = builtins.toString config.secrets.files.restic_pass.file;
+      user = "matrix-synapse";
+    };
+    "vaultwarden" = {
+      paths = [ "/var/lib/bitwarden_rs" ];
+      repository = "sftp:restic@despondos.nao.sh:/etheria/backup/wind/vaultwarden";
+      initialize = true;
+      pruneOpts = [ "--keep-daily 7" "--keep-weekly 5" "--keep-monthly 12" "--keep-yearly 75" ];
+      timerConfig = { "OnCalendar" = "23:45"; };
+      extraOptions = [ "sftp.command='ssh restic@despondos.nao.sh -i ${config.secrets.files.ssh_key.file} -s sftp'" ];
+      passwordFile = builtins.toString config.secrets.files.restic_pass.file;
+      user = "vaultwarden";
+    };
+  };
+}

unstable/config/sources/default.nix

@@ -0,0 +1,11 @@
+let
+  sources = import ./nix/sources.nix;
+
+  # just use standard pkgs from sources
+  # so that we have our applyPattches function
+  pkgs = import sources.nixpkgs {};
+
+in {
+  nixus = sources.nixus;
+} // sources
+

unstable/config/sources/nix/sources.nix

@@ -0,0 +1,174 @@
+# This file has been generated by Niv.
+
+let
+
+  #
+  # The fetchers. fetch_<type> fetches specs of type <type>.
+  #
+
+  fetch_file = pkgs: name: spec:
+    let
+      name' = sanitizeName name + "-src";
+    in
+      if spec.builtin or true then
+        builtins_fetchurl { inherit (spec) url sha256; name = name'; }
+      else
+        pkgs.fetchurl { inherit (spec) url sha256; name = name'; };
+
+  fetch_tarball = pkgs: name: spec:
+    let
+      name' = sanitizeName name + "-src";
+    in
+      if spec.builtin or true then
+        builtins_fetchTarball { name = name'; inherit (spec) url sha256; }
+      else
+        pkgs.fetchzip { name = name'; inherit (spec) url sha256; };
+
+  fetch_git = name: spec:
+    let
+      ref =
+        if spec ? ref then spec.ref else
+          if spec ? branch then "refs/heads/${spec.branch}" else
+            if spec ? tag then "refs/tags/${spec.tag}" else
+              abort "In git source '${name}': Please specify `ref`, `tag` or `branch`!";
+    in
+      builtins.fetchGit { url = spec.repo; inherit (spec) rev; inherit ref; };
+
+  fetch_local = spec: spec.path;
+
+  fetch_builtin-tarball = name: throw
+    ''[${name}] The niv type "builtin-tarball" is deprecated. You should instead use `builtin = true`.
+        $ niv modify ${name} -a type=tarball -a builtin=true'';
+
+  fetch_builtin-url = name: throw
+    ''[${name}] The niv type "builtin-url" will soon be deprecated. You should instead use `builtin = true`.
+        $ niv modify ${name} -a type=file -a builtin=true'';
+
+  #
+  # Various helpers
+  #
+
+  # https://github.com/NixOS/nixpkgs/pull/83241/files#diff-c6f540a4f3bfa4b0e8b6bafd4cd54e8bR695
+  sanitizeName = name:
+    (
+      concatMapStrings (s: if builtins.isList s then "-" else s)
+        (
+          builtins.split "[^[:alnum:]+._?=-]+"
+            ((x: builtins.elemAt (builtins.match "\\.*(.*)" x) 0) name)
+        )
+    );
+
+  # The set of packages used when specs are fetched using non-builtins.
+  mkPkgs = sources: system:
+    let
+      sourcesNixpkgs =
+        import (builtins_fetchTarball { inherit (sources.nixpkgs) url sha256; }) { inherit system; };
+      hasNixpkgsPath = builtins.any (x: x.prefix == "nixpkgs") builtins.nixPath;
+      hasThisAsNixpkgsPath = <nixpkgs> == ./.;
+    in
+      if builtins.hasAttr "nixpkgs" sources
+      then sourcesNixpkgs
+      else if hasNixpkgsPath && ! hasThisAsNixpkgsPath then
+        import <nixpkgs> {}
+      else
+        abort
+          ''
+            Please specify either <nixpkgs> (through -I or NIX_PATH=nixpkgs=...) or
+            add a package called "nixpkgs" to your sources.json.
+          '';
+
+  # The actual fetching function.
+  fetch = pkgs: name: spec:
+
+    if ! builtins.hasAttr "type" spec then
+      abort "ERROR: niv spec ${name} does not have a 'type' attribute"
+    else if spec.type == "file" then fetch_file pkgs name spec
+    else if spec.type == "tarball" then fetch_tarball pkgs name spec
+    else if spec.type == "git" then fetch_git name spec
+    else if spec.type == "local" then fetch_local spec
+    else if spec.type == "builtin-tarball" then fetch_builtin-tarball name
+    else if spec.type == "builtin-url" then fetch_builtin-url name
+    else
+      abort "ERROR: niv spec ${name} has unknown type ${builtins.toJSON spec.type}";
+
+  # If the environment variable NIV_OVERRIDE_${name} is set, then use
+  # the path directly as opposed to the fetched source.
+  replace = name: drv:
+    let
+      saneName = stringAsChars (c: if isNull (builtins.match "[a-zA-Z0-9]" c) then "_" else c) name;
+      ersatz = builtins.getEnv "NIV_OVERRIDE_${saneName}";
+    in
+      if ersatz == "" then drv else
+        # this turns the string into an actual Nix path (for both absolute and
+        # relative paths)
+        if builtins.substring 0 1 ersatz == "/" then /. + ersatz else /. + builtins.getEnv "PWD" + "/${ersatz}";
+
+  # Ports of functions for older nix versions
+
+  # a Nix version of mapAttrs if the built-in doesn't exist
+  mapAttrs = builtins.mapAttrs or (
+    f: set: with builtins;
+    listToAttrs (map (attr: { name = attr; value = f attr set.${attr}; }) (attrNames set))
+  );
+
+  # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/lists.nix#L295
+  range = first: last: if first > last then [] else builtins.genList (n: first + n) (last - first + 1);
+
+  # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L257
+  stringToCharacters = s: map (p: builtins.substring p 1 s) (range 0 (builtins.stringLength s - 1));
+
+  # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L269
+  stringAsChars = f: s: concatStrings (map f (stringToCharacters s));
+  concatMapStrings = f: list: concatStrings (map f list);
+  concatStrings = builtins.concatStringsSep "";
+
+  # https://github.com/NixOS/nixpkgs/blob/8a9f58a375c401b96da862d969f66429def1d118/lib/attrsets.nix#L331
+  optionalAttrs = cond: as: if cond then as else {};
+
+  # fetchTarball version that is compatible between all the versions of Nix
+  builtins_fetchTarball = { url, name ? null, sha256 }@attrs:
+    let
+      inherit (builtins) lessThan nixVersion fetchTarball;
+    in
+      if lessThan nixVersion "1.12" then
+        fetchTarball ({ inherit url; } // (optionalAttrs (!isNull name) { inherit name; }))
+      else
+        fetchTarball attrs;
+
+  # fetchurl version that is compatible between all the versions of Nix
+  builtins_fetchurl = { url, name ? null, sha256 }@attrs:
+    let
+      inherit (builtins) lessThan nixVersion fetchurl;
+    in
+      if lessThan nixVersion "1.12" then
+        fetchurl ({ inherit url; } // (optionalAttrs (!isNull name) { inherit name; }))
+      else
+        fetchurl attrs;
+
+  # Create the final "sources" from the config
+  mkSources = config:
+    mapAttrs (
+      name: spec:
+        if builtins.hasAttr "outPath" spec
+        then abort
+          "The values in sources.json should not have an 'outPath' attribute"
+        else
+          spec // { outPath = replace name (fetch config.pkgs name spec); }
+    ) config.sources;
+
+  # The "config" used by the fetchers
+  mkConfig =
+    { sourcesFile ? if builtins.pathExists ./sources.json then ./sources.json else null
+    , sources ? if isNull sourcesFile then {} else builtins.fromJSON (builtins.readFile sourcesFile)
+    , system ? builtins.currentSystem
+    , pkgs ? mkPkgs sources system
+    }: rec {
+      # The sources, i.e. the attribute set of spec name to spec
+      inherit sources;
+
+      # The "pkgs" (evaluated nixpkgs) to use for e.g. non-builtin fetchers
+      inherit pkgs;
+    };
+
+in
+mkSources (mkConfig {}) // { __functor = _: settings: mkSources (mkConfig settings); }

unstable/deploy/default.nix

@@ -1,5 +1,5 @@
 let
-  sources = import ../config/sources;
+  sources = import ../unstable/config/sources;
 in import "${sources.nixus}" {} ({ config, ... }: {
 
   defaults = { name, ... }: {