From 8bf83d7a27c08599820f145c073d979744b81c63 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Isma=C3=ABl=20Bouya?= <ismael.bouya@normalesup.org>
Date: Thu, 13 Feb 2020 13:07:06 +0100
Subject: Add rsync backup via dilion

---
 modules/private/system/dilion.nix  | 25 +++++++++++++++++++++++++
 modules/private/system/eldiron.nix | 19 ++++++++++++++++++-
 2 files changed, 43 insertions(+), 1 deletion(-)

(limited to 'modules/private')

diff --git a/modules/private/system/dilion.nix b/modules/private/system/dilion.nix
index 258506b..dbfd38f 100644
--- a/modules/private/system/dilion.nix
+++ b/modules/private/system/dilion.nix
@@ -41,6 +41,31 @@
 
   programs.zsh.enable = true;
 
+  users.users.backup = {
+    home = "/var/lib/backup";
+    createHome = true;
+    hashedPassword = "!";
+    isSystemUser = true;
+    shell = pkgs.bashInteractive;
+    openssh.authorizedKeys.keys = let
+    in
+      ["command=\"${pkgs.rrsync_sudo}/bin/rrsync /var/lib/backup/eldiron/\"  ${config.myEnv.rsync_backup.ssh_key.public}"];
+  };
+  security.sudo.extraRules = [
+    {
+      commands = [
+        { command = "${pkgs.rsync}/bin/rsync"; options = [ "NOPASSWD" ]; }
+      ];
+      users = [ "backup" ];
+      runAs = "root";
+    }
+  ];
+
+  system.activationScripts.backup_home = ''
+    chown root:root /var/lib/backup
+    install -m 0750 -o backup -g root -d /var/lib/backup/eldiron
+  '';
+
   time.timeZone = "Europe/Paris";
   nix = {
     useSandbox = "relaxed";
diff --git a/modules/private/system/eldiron.nix b/modules/private/system/eldiron.nix
index 5e3d45c..ab48ab4 100644
--- a/modules/private/system/eldiron.nix
+++ b/modules/private/system/eldiron.nix
@@ -39,6 +39,23 @@
   services.duplyBackup.enable = true;
   services.duplyBackup.profiles.oldies.rootDir = "/var/lib/oldies";
 
+  secrets.keys = [
+    {
+      dest = "rsync_backup/identity";
+      user = "root";
+      group = "root";
+      permissions = "0400";
+      text = config.myEnv.rsync_backup.ssh_key.private;
+    }
+  ];
+  programs.ssh.knownHosts.dilion = {
+    hostNames = ["dilion.immae.eu"];
+    publicKey = let
+      profile = config.myEnv.rsync_backup.profiles.dilion;
+    in
+      "${profile.host_key_type} ${profile.host_key}";
+  };
+
   deployment = {
     targetEnv = "hetzner";
     hetzner = {
@@ -65,7 +82,7 @@
     systemCronJobs = [
       ''
         # The star after /var/lib/* avoids deleting all folders in case of problem
-        0 3,9,15,21 * * * root rsync -e "ssh -i /root/.ssh/id_charon_vpn" --new-compress -aAXv --delete --numeric-ids --super --rsync-path="sudo rsync" /var/lib/* immae@immae.eu: > /dev/null
+        0 3,9,15,21 * * * root rsync -e "ssh -i /var/secrets/rsync_backup/identity" --new-compress -aAXv --delete --numeric-ids --super --rsync-path="sudo rsync" /var/lib/* backup@dilion.immae.eu: > /dev/null
         0 0 * * * root journalctl -q --since="25 hours ago" -u postfix -g "immae.eu.*Recipient address rejected"
       ''
     ];
-- 
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