WIP: temmie/userweb: use bro to proxy sendmail requests out of sandbox

flake.lock

@@ -1,5 +1,27 @@
 {
   "nodes": {
+    "bro": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "rust-overlay": "rust-overlay"
+      },
+      "locked": {
+        "lastModified": 1779629827,
+        "narHash": "sha256-nrlB50/oelB8oFx9DhOoXI5z0VoTZGEA6XxYvkvpqDA=",
+        "ref": "main",
+        "rev": "7d0f35e12e4dec39f981c08fc33515589f41f4a5",
+        "revCount": 3,
+        "type": "git",
+        "url": "https://git.pvv.ntnu.no/Projects/bro.git"
+      },
+      "original": {
+        "ref": "main",
+        "type": "git",
+        "url": "https://git.pvv.ntnu.no/Projects/bro.git"
+      }
+    },
     "crane": {
       "locked": {
         "lastModified": 1776635034,
@@ -101,7 +123,7 @@
         "nixpkgs": [
           "nixpkgs-unstable"
         ],
-        "rust-overlay": "rust-overlay"
+        "rust-overlay": "rust-overlay_2"
       },
       "locked": {
         "lastModified": 1777019032,
@@ -165,7 +187,7 @@
         "nixpkgs": [
           "nixpkgs"
         ],
-        "rust-overlay": "rust-overlay_2"
+        "rust-overlay": "rust-overlay_3"
       },
       "locked": {
         "lastModified": 1767906976,
@@ -352,6 +374,7 @@
     },
     "root": {
       "inputs": {
+        "bro": "bro",
         "dibbler": "dibbler",
         "disko": "disko",
         "gergle": "gergle",
@@ -377,7 +400,7 @@
         "nixpkgs": [
           "nixpkgs"
         ],
-        "rust-overlay": "rust-overlay_3"
+        "rust-overlay": "rust-overlay_4"
       },
       "locked": {
         "lastModified": 1778600367,
@@ -396,6 +419,27 @@
       }
     },
     "rust-overlay": {
+      "inputs": {
+        "nixpkgs": [
+          "bro",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1779419951,
+        "narHash": "sha256-dMX0PUslUHPajP6o8FEoRdFv9afq/dec4POR0vVfjK4=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "5b5c521d6cae9ef4aa32f888eb2c0ce595c9be52",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    },
+    "rust-overlay_2": {
       "inputs": {
         "nixpkgs": [
           "greg-ng",
@@ -416,7 +460,7 @@
         "type": "github"
       }
     },
-    "rust-overlay_2": {
+    "rust-overlay_3": {
       "inputs": {
         "nixpkgs": [
           "minecraft-heatmap",
@@ -437,7 +481,7 @@
         "type": "github"
       }
     },
-    "rust-overlay_3": {
+    "rust-overlay_4": {
       "inputs": {
         "nixpkgs": [
           "roowho2",

flake.nix

@@ -47,6 +47,9 @@
 
     qotd.url = "git+https://git.pvv.ntnu.no/Projects/qotd.git?ref=main";
     qotd.inputs.nixpkgs.follows = "nixpkgs";
+
+    bro.url = "git+https://git.pvv.ntnu.no/Projects/bro.git?ref=main";
+    bro.inputs.nixpkgs.follows = "nixpkgs";
   };
 
   outputs = {
@@ -214,7 +217,14 @@
         };
         shark = stableNixosConfig "shark" {};
         wenche = stableNixosConfig "wenche" {};
-        temmie = stableNixosConfig "temmie" {};
+        temmie = stableNixosConfig "temmie" {
+          overlays = [
+            inputs.bro.overlays.default
+          ];
+          modules = [
+            inputs.bro.nixosModules.default
+          ];
+        };
         gluttony = stableNixosConfig "gluttony" {
           overlays = [
             (final: prev: { bluemap = final.callPackage ./packages/bluemap.nix {}; })
@@ -232,20 +242,6 @@
           ];
         };
 
-        grevling = stableNixosConfig "grevling" {
-          modules = [
-            ./hosts/grevling/configuration.nix
-            sops-nix.nixosModules.sops
-          ];
-        };
-
-        tuba = stableNixosConfig "grevling" {
-          modules = [
-            ./hosts/tuba/configuration.nix
-            sops-nix.nixosModules.sops
-          ];
-        };
-
         brzeczyszczykiewicz = stableNixosConfig "brzeczyszczykiewicz" {
           modules = [
             inputs.grzegorz-clients.nixosModules.grzegorz-webui

hosts/grevling/configuration.nix

@@ -1,36 +0,0 @@
-{ config, pkgs, values, ... }:
-{
-  imports = [
-      # Include the results of the hardware scan.
-      ./hardware-configuration.nix
-      ../../base.nix
-      ../../misc/metrics-exporters.nix
-
-      ./services/openvpn
-    ];
-
-  boot.loader.systemd-boot.enable = true;
-  boot.loader.efi.canTouchEfiVariables = true;
-
-  networking.hostName = "grevling";
-
-  # systemd.network.networks."30-eno1" = values.defaultNetworkConfig // {
-  #   matchConfig.Name = "eno1";
-  #   address = with values.hosts.georg; [ (ipv4 + "/25") (ipv6 + "/64") ];
-  # };
-
-  # List packages installed in system profile
-  environment.systemPackages = with pkgs; [
-  ];
-
-  # List services that you want to enable:
-
-  # This value determines the NixOS release from which the default
-  # settings for stateful data, like file locations and database versions
-  # on your system were taken. It‘s perfectly fine and recommended to leave
-  # this value at the release version of the first install of this system.
-  # Before changing this value read the documentation for this option
-  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
-  system.stateVersion = "23.05"; # Did you read the comment?
-
-}

hosts/grevling/hardware-configuration.nix

@@ -1,40 +0,0 @@
-# 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 + "/installer/scan/not-detected.nix")
-    ];
-
-  boot.initrd.availableKernelModules = [ "xhci_pci" "ehci_pci" "ahci" "usb_storage" "usbhid" "sd_mod" ];
-  boot.initrd.kernelModules = [ ];
-  boot.kernelModules = [ "kvm-intel" ];
-  boot.extraModulePackages = [ ];
-
-  fileSystems."/" =
-    { device = "/dev/disk/by-uuid/33825f0d-5a63-40fc-83db-bfa1ebb72ba0";
-      fsType = "ext4";
-    };
-
-  fileSystems."/boot" =
-    { device = "/dev/disk/by-uuid/145E-7362";
-      fsType = "vfat";
-    };
-
-  swapDevices =
-    [ { device = "/dev/disk/by-uuid/7ed27e21-3247-44cd-8bcc-5d4a2efebf57"; }
-    ];
-
-  # Enables DHCP on each ethernet and wireless interface. In case of scripted networking
-  # (the default) this is the recommended approach. When using systemd-networkd it's
-  # still possible to use this option, but it's recommended to use it in conjunction
-  # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
-  networking.useDHCP = lib.mkDefault true;
-  # networking.interfaces.eno1.useDHCP = lib.mkDefault true;
-  # networking.interfaces.enp2s2.useDHCP = lib.mkDefault true;
-
-  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
-  hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
-}

hosts/grevling/services/openvpn/default.nix

@@ -1,77 +0,0 @@
-{ pkgs, lib, values, ... }:
-{
-  services.openvpn.servers."ov-tunnel" = {
-    config = let
-      conf = {
-        # TODO: use aliases
-        local = "129.241.210.191";
-        port = 1194;
-        proto = "udp";
-        dev = "tap";
-
-        # TODO: set up
-        ca = "";
-        cert = "";
-        key = "";
-        dh = "";
-
-        # Maintain a record of client <-> virtual IP address
-        # associations in this file.  If OpenVPN goes down or
-        # is restarted, reconnecting clients can be assigned
-        # the same virtual IP address from the pool that was
-        # previously assigned.
-        ifconfig-pool-persist = ./ipp.txt;
-
-        server-bridge = builtins.concatStringsSep " " [
-          "129.241.210.129"
-          "255.255.255.128"
-          "129.241.210.253"
-          "129.241.210.254"
-        ];
-
-        keepalive = "10 120";
-        cipher = "none";
-
-        user = "nobody";
-        group = "nobody";
-
-        status = "/var/log/openvpn-status.log";
-
-        client-config-dir = pkgs.writeTextDir "tuba" ''
-          # Sett IP-adr. for tap0 til tubas PVV-adr.
-          ifconfig-push ${values.services.tuba-tap} 255.255.255.128
-          # Hvordan skal man faa dette til aa funke, tro?
-          #ifconfig-ipv6-push 2001:700:300:1900::xxx/64
-          
-          # La tuba bruke std. PVV-gateway til all trafikk (unntatt
-          # VPN-tunnellen).
-          push "redirect-gateway"
-        '';
-
-        persist-key = true;
-        persist-tun = true;
-
-        verb = 5;
-
-        explicit-exit-notify = 1;
-      };
-    in lib.pipe conf [
-      (lib.filterAttrs (_: value: !(builtins.isNull value || value == false)))
-      (builtins.mapAttrs (_: value:
-        if builtins.isList value then builtins.concatStringsSep " " (map toString value)
-        else if value == true then value
-        else if builtins.any (f: f value) [
-          builtins.isString
-          builtins.isInt
-          builtins.isFloat
-          lib.isPath
-          lib.isDerivation
-        ] then toString value
-        else throw "Unknown value in grevling openvpn config, deading now\n${value}"
-      ))
-      (lib.mapAttrsToList (name: value: if value == true then name else "${name} ${value}"))
-      (builtins.concatStringsSep "\n")
-      (x: x + "\n\n")
-    ];
-  };
-}

hosts/temmie/services/userweb/mail.nix

@@ -1,4 +1,4 @@
-{ config, lib, ... }:
+{ config, lib, pkgs, ... }:
 {
   services.postfix.enable = lib.mkForce false;
 
@@ -9,4 +9,74 @@
       remotes = "mail.pvv.ntnu.no smtp --port=25";
     };
   };
+
+  services.bro = {
+    enable = true;
+
+    instances.userweb-sendmail = {
+      enable = true;
+
+      client = {
+        settings.BRO_FILE_FLAGS = [
+          "-C"
+        ];
+      };
+
+      server = {
+        settings = {
+          executable = lib.getExe pkgs.system-sendmail;
+          # allowed-env = [  ];
+        };
+      };
+    };
+  };
+
+  environment.systemPackages = [
+    (config.services.bro.instances.userweb-sendmail.client.package.overrideAttrs (prev: {
+      postInstall = (prev.postInstall or "") + ''
+        mv "$out/bin/sendmail" "$out/bin/bro-sendmail"
+      '';
+    }))
+  ];
+
+  systemd.services.bro-userweb-sendmail = {
+    serviceConfig = {
+      User = "nobody";
+      Group = "nobody";
+
+      AmbientCapabilities = "";
+      CapabilityBoundingSet = "";
+      NoNewPrivileges = false;
+      ProtectSystem = "strict";
+      ProtectHome = true;
+      PrivateTmp = true;
+      PrivateDevices = true;
+      PrivateUsers = false;
+      ProtectHostname = true;
+      ProtectClock = true;
+      ProtectKernelTunables = true;
+      ProtectKernelModules = true;
+      ProtectKernelLogs = true;
+      ProtectControlGroups = true;
+      RestrictAddressFamilies = [
+        "AF_UNIX"
+        "AF_INET"
+        "AF_INET6"
+        "AF_NETLINK"
+      ];
+      LockPersonality = true;
+      MemoryDenyWriteExecute = true;
+      PrivateMounts = true;
+      ProcSubset = "pid";
+      ProtectProc = "invisible";
+      RemoveIPC = true;
+      RestrictNamespaces = true;
+      RestrictRealtime = true;
+      RestrictSUIDSGID = true;
+      UMask = "0027";
+      SystemCallArchitectures = "native";
+      # SystemCallFilter = [
+      # ];
+    };
+  };
 }

hosts/tuba/configuration.nix

@@ -1,36 +0,0 @@
-{ config, pkgs, values, ... }:
-{
-  imports = [
-      # Include the results of the hardware scan.
-      ./hardware-configuration.nix
-      ../../base.nix
-      ../../misc/metrics-exporters.nix
-
-      ./services/openvpn
-    ];
-
-  boot.loader.systemd-boot.enable = true;
-  boot.loader.efi.canTouchEfiVariables = true;
-
-  networking.hostName = "tuba";
-
-  # systemd.network.networks."30-eno1" = values.defaultNetworkConfig // {
-  #   matchConfig.Name = "eno1";
-  #   address = with values.hosts.georg; [ (ipv4 + "/25") (ipv6 + "/64") ];
-  # };
-
-  # List packages installed in system profile
-  environment.systemPackages = with pkgs; [
-  ];
-
-  # List services that you want to enable:
-
-  # This value determines the NixOS release from which the default
-  # settings for stateful data, like file locations and database versions
-  # on your system were taken. It‘s perfectly fine and recommended to leave
-  # this value at the release version of the first install of this system.
-  # Before changing this value read the documentation for this option
-  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
-  system.stateVersion = "23.05"; # Did you read the comment?
-
-}

hosts/tuba/hardware-configuration.nix

@@ -1,40 +0,0 @@
-# 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 + "/installer/scan/not-detected.nix")
-    ];
-
-  boot.initrd.availableKernelModules = [ "xhci_pci" "ehci_pci" "ahci" "usb_storage" "usbhid" "sd_mod" ];
-  boot.initrd.kernelModules = [ ];
-  boot.kernelModules = [ "kvm-intel" ];
-  boot.extraModulePackages = [ ];
-
-  fileSystems."/" =
-    { device = "/dev/disk/by-uuid/33825f0d-5a63-40fc-83db-bfa1ebb72ba0";
-      fsType = "ext4";
-    };
-
-  fileSystems."/boot" =
-    { device = "/dev/disk/by-uuid/145E-7362";
-      fsType = "vfat";
-    };
-
-  swapDevices =
-    [ { device = "/dev/disk/by-uuid/7ed27e21-3247-44cd-8bcc-5d4a2efebf57"; }
-    ];
-
-  # Enables DHCP on each ethernet and wireless interface. In case of scripted networking
-  # (the default) this is the recommended approach. When using systemd-networkd it's
-  # still possible to use this option, but it's recommended to use it in conjunction
-  # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
-  networking.useDHCP = lib.mkDefault true;
-  # networking.interfaces.eno1.useDHCP = lib.mkDefault true;
-  # networking.interfaces.enp2s2.useDHCP = lib.mkDefault true;
-
-  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
-  hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
-}

hosts/tuba/services/openvpn/default.nix

@@ -1,54 +0,0 @@
-{ lib, values, ... }:
-{
-  services.openvpn.servers."ov-tunnel" = {
-    config = let
-      conf = {
-        # TODO: use aliases
-        client = true;
-        dev = "tap";
-        proto = "udp";
-        remote = "129.241.210.191 1194";
-
-        resolv-retry = "infinite";
-        nobind = true;
-
-        # # TODO: set up
-        ca = "";
-        cert = "";
-        key = "";
-        remote-cert-tls = "server";
-        cipher = "none";
-
-        user = "nobody";
-        group = "nobody";
-
-        status = "/var/log/openvpn-status.log";
-
-        persist-key = true;
-        persist-tun = true;
-
-        verb = 5;
-
-        # script-security = 2;
-        # up = "systemctl restart rwhod";
-      };
-    in lib.pipe conf [
-      (lib.filterAttrs (_: value: !(builtins.isNull value || value == false)))
-      (builtins.mapAttrs (_: value:
-        if builtins.isList value then builtins.concatStringsSep " " (map toString value)
-        else if value == true then value
-        else if builtins.any (f: f value) [
-          builtins.isString
-          builtins.isInt
-          builtins.isFloat
-          lib.isPath
-          lib.isDerivation
-        ] then toString value
-        else throw "Unknown value in tuba openvpn config, deading now\n${value}"
-      ))
-      (lib.mapAttrsToList (name: value: if value == true then name else "${name} ${value}"))
-      (builtins.concatStringsSep "\n")
-      (x: x + "\n\n")
-    ];
-  };
-}

values.nix

@@ -26,12 +26,6 @@ in rec {
       ipv4 = pvv-ipv4 213;
       ipv6 = pvv-ipv6 213;
     };
-    grevling-tap = {
-      ipv4 = pvv-ipv4 251;
-    };
-    tuba-tap = {
-      ipv4 = pvv-ipv4 252;
-    };
   };
 
   hosts = {
@@ -117,14 +111,6 @@ in rec {
       ipv4 = pvv-ipv4 228;
       ipv6 = pvv-ipv6 228;
     };
-    grevling = {
-      ipv4 = pvv-ipv4 198;
-      ipv6 = pvv-ipv6 198;
-    };
-    tuba = {
-      ipv4 = pvv-ipv4 199;
-      ipv6 = pvv-ipv6 199;
-    };
   };
 
   defaultNetworkConfig = {