diff --git a/clanModules/sshd/roles/server.nix b/clanModules/sshd/roles/server.nix
index 6edf9c43c..c66e21acd 100644
--- a/clanModules/sshd/roles/server.nix
+++ b/clanModules/sshd/roles/server.nix
@@ -7,10 +7,12 @@
 let
   stringSet = list: builtins.attrNames (builtins.groupBy lib.id list);
 
+  domains = stringSet config.clan.sshd.certificate.searchDomains;
+
   signArgs = builtins.concatStringsSep " " (
-    builtins.map (domain: "-n ${lib.escapeShellArg "${config.clan.core.machineName}.${domain}"}") (
-      stringSet config.clan.sshd.certificate.searchDomains
-    )
+    builtins.map (
+      domain: "-n ${lib.escapeShellArg "${config.clan.core.machineName}.${domain}"}"
+    ) domains
   );
   cfg = config.clan.sshd;
 in
@@ -51,6 +53,10 @@ in
         "openssh"
         "openssh-ca"
       ];
+      validation = {
+        name = config.clan.core.machineName;
+        domains = lib.genAttrs config.clan.sshd.certificate.searchDomains lib.id;
+      };
       runtimeInputs = [
         pkgs.openssh
         pkgs.jq
diff --git a/nixosModules/clanCore/vars/interface.nix b/nixosModules/clanCore/vars/interface.nix
index 77a60b2f0..27208e308 100644
--- a/nixosModules/clanCore/vars/interface.nix
+++ b/nixosModules/clanCore/vars/interface.nix
@@ -79,22 +79,27 @@ in
               description = ''
                 A set of values that invalidate the generated values.
                 If any of these values change, the generated values will be re-generated.
+                Lists are not allowed as of now due to potential ordering issues
               '';
               default = null;
-              type =
-                let
-                  data = nullOr (oneOf [
+              # This is more restrictive than json without lists, but currently
+              # if a value contains a list, we get an infinite recursion which
+              # is hard to understand.
+              type = nullOr (oneOf [
+                bool
+                int
+                str
+                (attrsOf (oneOf [
+                  bool
+                  int
+                  str
+                  (attrsOf (oneOf [
                     bool
                     int
                     str
-                    (attrsOf data)
-                    # lists are not allowed as of now due to potential ordering issues
-                  ]);
-                in
-                data
-                // {
-                  description = "JSON compatible data structure";
-                };
+                  ]))
+                ]))
+              ]);
             };
             # the validationHash is the validation interface to the outside world
             validationHash = lib.mkOption {
diff --git a/pkgs/clan-cli/clan_cli/facts/generate.py b/pkgs/clan-cli/clan_cli/facts/generate.py
index 39eaa258c..d82855623 100644
--- a/pkgs/clan-cli/clan_cli/facts/generate.py
+++ b/pkgs/clan-cli/clan_cli/facts/generate.py
@@ -46,14 +46,20 @@ def bubblewrap_cmd(generator: str, facts_dir: Path, secrets_dir: Path) -> list[s
         ],
         [
             "bwrap",
+            "--unshare-all",
+            "--tmpfs",  "/",
             "--ro-bind", "/nix/store", "/nix/store",
-            "--tmpfs",  "/usr/lib/systemd",
             "--dev", "/dev",
+            # not allowed to bind procfs in some sandboxes
             "--bind", str(facts_dir), str(facts_dir),
             "--bind", str(secrets_dir), str(secrets_dir),
-            "--unshare-all",
-            "--unshare-user",
+            "--chdir", "/",
+            # Doesn't work in our CI?
+            #"--proc", "/proc",
+            #"--hostname", "facts",
+            "--bind", "/proc", "/proc",
             "--uid", "1000",
+            "--gid", "1000",
             "--",
             "bash", "-c", generator
         ],
diff --git a/pkgs/clan-cli/clan_cli/vars/generate.py b/pkgs/clan-cli/clan_cli/vars/generate.py
index 7a4576637..bad8478c1 100644
--- a/pkgs/clan-cli/clan_cli/vars/generate.py
+++ b/pkgs/clan-cli/clan_cli/vars/generate.py
@@ -88,14 +88,20 @@ def bubblewrap_cmd(generator: str, tmpdir: Path) -> list[str]:
         ],
         [
             "bwrap",
+            "--unshare-all",
+            "--tmpfs",  "/",
             "--ro-bind", "/nix/store", "/nix/store",
             *(["--ro-bind", str(test_store), str(test_store)] if test_store else []),
-            "--tmpfs",  "/usr/lib/systemd",
             "--dev", "/dev",
+            # not allowed to bind procfs in some sandboxes
             "--bind", str(tmpdir), str(tmpdir),
-            "--unshare-all",
-            "--unshare-user",
+            "--chdir", "/",
+            # Doesn't work in our CI?
+            #"--proc", "/proc",
+            #"--hostname", "facts",
+            "--bind", "/proc", "/proc",
             "--uid", "1000",
+            "--gid", "1000",
             "--",
             "bash", "-c", generator
         ],