From 3d4e281d8cfff8ee78398c5b0edcccba876d548c Mon Sep 17 00:00:00 2001
From: niten <niten@fudo.org>
Date: Wed, 5 Jun 2024 13:47:11 -0700
Subject: [PATCH] Add kerberos configuration

---
 paris-container.nix | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/paris-container.nix b/paris-container.nix
index 5d50300..945296b 100644
--- a/paris-container.nix
+++ b/paris-container.nix
@@ -212,6 +212,10 @@ in {
           "LDAP_DEFAULT_AUTHTOKEN=${readFile cfg.ldap.bind-token-file}";
         target-file = "/run/paris/sssd.env";
       };
+      parisKeytab = {
+        source-file = cfg.kerberos.keytab;
+        target-file = "/run/paris/keytab";
+      };
     } // (listToAttrs (map (keypair:
       nameValuePair (keypairFilename keypair) {
         source-file = keypair.private-key;
@@ -226,6 +230,9 @@ in {
       environmentFiles = [ hostSecrets.parisLdapEnv.target-file ];
     };
 
+    systemd.services."container@paris".after =
+      config.fudo.secrets.secret-target;
+
     containers.paris = {
       autoStart = true;
       macvlans =
@@ -239,6 +246,16 @@ in {
           hostPath = hostSecrets.parisSssdEnv.target-file;
           isReadOnly = true;
         };
+
+        "/etc/krb5.keytab" = {
+          hostPath = hostSecrets.parisKeytab.target-file;
+          isReadOnly = true;
+        };
+
+        "/etc/krb5.conf" = {
+          hostPath = "/etc/krb5.conf";
+          isReadOnly = true;
+        };
       } // (listToAttrs (map (keypair:
         nameValuePair "/run/openssh/keys/${keypairFilename keypair}" {
           hostPath = "/run/paris/openssh/${keypairFilename keypair}";
@@ -250,6 +267,23 @@ in {
 
         environment.systemPackages = packages;
 
+        programs.ssh = {
+          extraConfig = ''
+            GSSAPIAuthentication yes
+            GSSAPIDelegateCredentials yes
+          '';
+        };
+
+        security.pam.krb5.enable = true;
+
+        krb5 = {
+          enable = true;
+          kerberos = pkgs.heimdal;
+          libdefaults = config.krb5.libdefaults;
+          appdefaults = config.krb5.appdefaults;
+          domain_realm = config.krb5.domain_realm;
+        };
+
         services = {
           openssh = {
             enable = true;
@@ -262,6 +296,10 @@ in {
               UseDns = true;
               PermitRootLogin = "no";
             };
+            extraConfig = ''
+              GSSAPIAuthentication yes
+              GSSAPICleanupCredentials yes
+            '';
           };
 
           sssd = {