From e890eb244af82ba678e894a84983db5057fbb60a Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Sun, 14 Feb 2016 13:26:37 +0100
Subject: krebs.setuid: init

---
 krebs/3modules/default.nix |  1 +
 krebs/3modules/setuid.nix  | 75 ++++++++++++++++++++++++++++++++++++++++++++++
 tv/2configs/xu-qemu0.nix   | 44 +++++++++------------------
 3 files changed, 90 insertions(+), 30 deletions(-)
 create mode 100644 krebs/3modules/setuid.nix

diff --git a/krebs/3modules/default.nix b/krebs/3modules/default.nix
index 3d51076c..b2a02e9c 100644
--- a/krebs/3modules/default.nix
+++ b/krebs/3modules/default.nix
@@ -27,6 +27,7 @@ let
       ./retiolum-bootstrap.nix
       ./realwallpaper.nix
       ./retiolum.nix
+      ./setuid.nix
       ./tinc_graphs.nix
       ./urlwatch.nix
     ];
diff --git a/krebs/3modules/setuid.nix b/krebs/3modules/setuid.nix
new file mode 100644
index 00000000..22123c92
--- /dev/null
+++ b/krebs/3modules/setuid.nix
@@ -0,0 +1,75 @@
+{ config, pkgs, lib, ... }:
+with lib;
+let
+  cfg = config.krebs.setuid;
+
+  out = {
+    options.krebs.setuid = api;
+    config = imp;
+  };
+
+  api = mkOption {
+    default = {};
+    type = let
+      # TODO make wrapperDir configurable
+      inherit (config.security) wrapperDir;
+      inherit (config.users) groups users;
+    in types.attrsOf (types.submodule ({ config, ... }: {
+      options = {
+        name = mkOption {
+          type = types.filename;
+          default = config._module.args.name;
+        };
+        filename = mkOption {
+          type = mkOptionType {
+            # TODO unyuck string and merge with toC
+            name = "derivation or string";
+            check = x:
+              isDerivation x ||
+              isString x;
+          };
+          apply = toString;
+        };
+        owner = mkOption {
+          default = "root";
+          type = types.enum (attrNames users);
+        };
+        group = mkOption {
+          default = "root";
+          type = types.enum (attrNames groups);
+        };
+        mode = mkOption {
+          default = "4710";
+          type = mkOptionType {
+            # TODO admit symbolic mode
+            name = "octal mode";
+            check = x:
+              isString x &&
+              match "[0-7][0-7][0-7][0-7]" x != null;
+          };
+        };
+        activate = mkOption {
+          type = types.str;
+          visible = false;
+          readOnly = true;
+        };
+      };
+      config.activate = let
+        src = pkgs.execve config.name {
+          inherit (config) filename;
+        };
+        dst = "${wrapperDir}/${config.name}";
+      in ''
+        cp ${src} ${dst}
+        chown ${config.owner}.${config.group} ${dst}
+        chmod ${config.mode} ${dst}
+      '';
+    }));
+  };
+
+  imp = {
+    system.activationScripts."krebs.setuid" = stringAfter [ "setuid" ]
+      (concatMapStringsSep "\n" (getAttr "activate") (attrValues cfg));
+  };
+
+in out
diff --git a/tv/2configs/xu-qemu0.nix b/tv/2configs/xu-qemu0.nix
index 9962ca56..df35f5c3 100644
--- a/tv/2configs/xu-qemu0.nix
+++ b/tv/2configs/xu-qemu0.nix
@@ -79,7 +79,7 @@ with lib;
           ${pkgs.kvm}/bin/qemu-img create "$img" 10G
         fi
         exec ${pkgs.kvm}/bin/qemu-kvm \
-            -monitor unix:$HOME/tmp/xu-qemu0.sock,server,nowait \
+            -monitor unix:$HOME/tmp/xu-qemu0-monitor.sock,server,nowait \
             -boot order=cd \
             -cdrom ${pkgs.fetchurl {
               url = https://nixos.org/releases/nixos/15.09/nixos-15.09.1012.9fe0c23/nixos-minimal-15.09.1012.9fe0c23-x86_64-linux.iso;
@@ -95,36 +95,20 @@ with lib;
     };
   };
 
-  system.activationScripts."krebs.setuid.xu-qemu0-monitor" = stringAfter [ "setuid" ] ''
-    src=${pkgs.execve "xu-qemu0-monitor" {
-      # TODO toC should handle derivation, then we don't have to "${...}" here
-      filename = "${pkgs.writeDash "xu-qemu0-monitor" ''
-        exec ${pkgs.socat}/bin/socat \
-            stdio \
-            UNIX-CONNECT:${config.users.users.xu-qemu0.home}/tmp/xu-qemu0.sock \
-      ''}";
-    }}
-    dst=${config.security.wrapperDir}/xu-qemu0-monitor
-    cp "$src" "$dst"
-    chown xu-qemu0.tv "$dst"
-    chmod 4710 "$dst"
-  '';
+  krebs.setuid.xu-qemu0-monitor = {
+    filename = pkgs.writeDash "xu-qemu0-monitor" ''
+      exec ${pkgs.socat}/bin/socat \
+          stdio \
+          UNIX-CONNECT:${config.users.users.xu-qemu0.home}/tmp/xu-qemu0-monitor.sock \
+    '';
+    owner = "xu-qemu0";
+    group = "tv";
+  };
 
-  #TODO krebs.setuid.qemu-bridge-helper = {
-  #  filename = "${pkgs.qemu}/libexec/qemu-bridge-helper";
-  #  owner = "root";
-  #  group = "qemu-users";
-  #  mode = "4710";
-  #};
-  system.activationScripts."krebs.setuid" = stringAfter [ "setuid" ] ''
-    src=${pkgs.execve "qemu-bridge-helper" {
-      filename = "${pkgs.qemu}/libexec/qemu-bridge-helper";
-    }}
-    dst=${config.security.wrapperDir}/qemu-bridge-helper
-    cp "$src" "$dst"
-    chown root.qemu-users "$dst"
-    chmod 4710 "$dst"
-  '';
+  krebs.setuid.qemu-bridge-helper = {
+    filename = "${pkgs.qemu}/libexec/qemu-bridge-helper";
+    group = "qemu-users";
+  };
 
   users.users.qemu-dnsmasq.uid = genid "qemu-dnsmasq";
 
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