From 76fb9da41fce405d87e5384e71855b5fbc06d45c Mon Sep 17 00:00:00 2001
From: Aaron Andersen <aaron@fosslib.net>
Date: Fri, 6 Oct 2023 12:49:52 -0400
Subject: nixos/openssh: add support for authorized principals

---
 nixos/modules/services/networking/ssh/sshd.nix | 35 +++++++++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

(limited to 'nixos/modules/services')

diff --git a/nixos/modules/services/networking/ssh/sshd.nix b/nixos/modules/services/networking/ssh/sshd.nix
index 327d19daca30..daa30fe09b89 100644
--- a/nixos/modules/services/networking/ssh/sshd.nix
+++ b/nixos/modules/services/networking/ssh/sshd.nix
@@ -74,6 +74,19 @@ let
       };
     };
 
+    options.openssh.authorizedPrincipals = mkOption {
+      type = with types; listOf types.singleLineStr;
+      default = [];
+      description = mdDoc ''
+        A list of verbatim principal names that should be added to the user's
+        authorized principals.
+      '';
+      example = [
+        "example@host"
+        "foo@bar"
+      ];
+    };
+
   };
 
   authKeysFiles = let
@@ -89,6 +102,16 @@ let
     ));
   in listToAttrs (map mkAuthKeyFile usersWithKeys);
 
+  authPrincipalsFiles = let
+    mkAuthPrincipalsFile = u: nameValuePair "ssh/authorized_principals.d/${u.name}" {
+      mode = "0444";
+      text = concatStringsSep "\n" u.openssh.authorizedPrincipals;
+    };
+    usersWithPrincipals = attrValues (flip filterAttrs config.users.users (n: u:
+      length u.openssh.authorizedPrincipals != 0
+    ));
+  in listToAttrs (map mkAuthPrincipalsFile usersWithPrincipals);
+
 in
 
 {
@@ -285,6 +308,14 @@ in
         type = types.submodule ({name, ...}: {
           freeformType = settingsFormat.type;
           options = {
+            AuthorizedPrincipalsFile = mkOption {
+              type = types.str;
+              default = "none"; # upstream default
+              description = lib.mdDoc ''
+                Specifies a file that lists principal names that are accepted for certificate authentication. The default
+                is `"none"`, i.e. not to use	a principals file.
+              '';
+            };
             LogLevel = mkOption {
               type = types.enum [ "QUIET" "FATAL" "ERROR" "INFO" "VERBOSE" "DEBUG" "DEBUG1" "DEBUG2" "DEBUG3" ];
               default = "INFO"; # upstream default
@@ -444,7 +475,7 @@ in
     services.openssh.moduliFile = mkDefault "${cfgc.package}/etc/ssh/moduli";
     services.openssh.sftpServerExecutable = mkDefault "${cfgc.package}/libexec/sftp-server";
 
-    environment.etc = authKeysFiles //
+    environment.etc = authKeysFiles // authPrincipalsFiles //
       { "ssh/moduli".source = cfg.moduliFile;
         "ssh/sshd_config".source = sshconf;
       };
@@ -541,6 +572,8 @@ in
     services.openssh.authorizedKeysFiles =
       [ "%h/.ssh/authorized_keys" "/etc/ssh/authorized_keys.d/%u" ];
 
+    services.openssh.settings.AuthorizedPrincipalsFile = mkIf (authPrincipalsFiles != {}) "/etc/ssh/authorized_principals.d/%u";
+
     services.openssh.extraConfig = mkOrder 0
       ''
         UsePAM yes
-- 
cgit 1.4.1