1 files changed, 109 insertions, 0 deletions
diff --git a/krebs/3modules/ssh.nix b/krebs/3modules/ssh.nix
new file mode 100644
index 00000000..58f3a3c1
--- /dev/null
+++ b/krebs/3modules/ssh.nix
@@ -0,0 +1,109 @@
+{ config, lib, ... }:
+with lib;
+let
+  cfg = config.krebs;
+
+  out = {
+    options.krebs = api;
+    config = lib.mkIf cfg.enable imp;
+  };
+
+  api = {
+    zone-head-config  = mkOption {
+      type = with types; attrsOf str;
+      description = ''
+        The zone configuration head which is being used to create the
+        zone files. The string for each key is pre-pended to the zone file.
+      '';
+      # TODO: configure the default somewhere else,
+      # maybe use krebs.dns.providers
+      default = {
+
+        # github.io -> 192.30.252.154
+        "krebsco.de" = ''
+          $TTL 86400
+          @ IN SOA dns19.ovh.net. tech.ovh.net. (2015052000 86400 3600 3600000 86400)
+                                IN NS     ns19.ovh.net.
+                                IN NS     dns19.ovh.net.
+        '';
+      };
+    };
+  };
+
+  imp = lib.mkMerge [
+    {
+      services.openssh.hostKeys =
+        let inherit (config.krebs.build.host.ssh) privkey; in
+        mkIf (privkey != null) [privkey];
+
+      services.openssh.knownHosts =
+        filterAttrs
+          (knownHostName: knownHost:
+            knownHost.publicKey != null &&
+            knownHost.hostNames != []
+          )
+          (mapAttrs
+            (hostName: host: {
+              hostNames =
+                concatLists
+                  (mapAttrsToList
+                    (netName: net:
+                      let
+                        aliases =
+                          concatLists [
+                            shortAliases
+                            net.aliases
+                            net.addrs
+                          ];
+                        shortAliases =
+                          optionals
+                            (cfg.dns.search-domain != null)
+                            (map (removeSuffix ".${cfg.dns.search-domain}")
+                                 (filter (hasSuffix ".${cfg.dns.search-domain}")
+                                         net.aliases));
+                        addPort = alias:
+                          if net.ssh.port != 22
+                            then "[${alias}]:${toString net.ssh.port}"
+                            else alias;
+                      in
+                      map addPort aliases
+                    )
+                    host.nets);
+              publicKey = host.ssh.pubkey;
+            })
+            (foldl' mergeAttrs {} [
+              cfg.hosts
+              {
+                localhost = {
+                  nets.local = {
+                    addrs = [ "127.0.0.1" "::1" ];
+                    aliases = [ "localhost" ];
+                    ssh.port = 22;
+                  };
+                  ssh.pubkey = config.krebs.build.host.ssh.pubkey;
+                };
+              }
+            ]));
+
+      programs.ssh.extraConfig = concatMapStrings
+        (net: ''
+          Host ${toString (net.aliases ++ net.addrs)}
+            Port ${toString net.ssh.port}
+        '')
+        (filter
+          (net: net.ssh.port != 22)
+          (concatMap (host: attrValues host.nets)
+            (mapAttrsToList
+              (_: host: recursiveUpdate host
+                (optionalAttrs (cfg.dns.search-domain != null &&
+                                hasAttr cfg.dns.search-domain host.nets) {
+                  nets."" = host.nets.${cfg.dns.search-domain} // {
+                    aliases = [host.name];
+                    addrs = [];
+                  };
+                }))
+              config.krebs.hosts)));
+    }
+  ];
+
+in out