Move `trustedUsers` and `allowedUsers` to separate config struct

These settings are not needed for libstore at all, they are just used by
the nix daemon *command* for authorization on unix domain sockets. My
moving them to a new configuration struct just in that file, we avoid
them leaking anywhere else.

Also, it is good to break up the mammoth `Settings` struct in general.
Issue #5638 tracks this.

The message is not changed because I do not want to regress in
convenience to the user. Just saying "this connection is not trusted"
doesn't tell them out to fix the issue. The ideal thing to do would be
to somehow parameterize `processCommand` on how the error should be
displayed, so different sorts of connections can display different
information to the user based on how authentication is performed for the
connection in question. This, however, is a good bit more work, so it is
left for the future.

This came up with me thinking about the tcp:// store (#5265). The larger
project is not TCP *per se*, but the idea that it should be possible for
something else to manage access control to services like the Nix Daemon,
and those services simply trust or trust the incoming connection as they
are told. This is a more capability-oriented way of thinking about trust
than "every server implements its own auth separately" as we are used to today.

Its very great that libstore itself already implements just this model,
and so via this refactor I basically want to "enshrine" that so it
continues to be the case.

1 files changed, 39 insertions, 2 deletions

diff --git a/src/nix/daemon.cc b/src/nix/daemon.cc
index 19fbbf155..b391ebed5 100644
--- a/src/nix/daemon.cc
+++ b/src/nix/daemon.cc
@@ -34,6 +34,43 @@
 using namespace nix;
 using namespace nix::daemon;
 
+struct UserSettings : Config {
+
+    Setting<Strings> trustedUsers{
+        this, {"root"}, "trusted-users",
+        R"(
+          A list of names of users (separated by whitespace) that have
+          additional rights when connecting to the Nix daemon, such as the
+          ability to specify additional binary caches, or to import unsigned
+          NARs. You can also specify groups by prefixing them with `@`; for
+          instance, `@wheel` means all users in the `wheel` group. The default
+          is `root`.
+
+          > **Warning**
+          >
+          > Adding a user to `trusted-users` is essentially equivalent to
+          > giving that user root access to the system. For example, the user
+          > can set `sandbox-paths` and thereby obtain read access to
+          > directories that are otherwise inacessible to them.
+        )"};
+
+    /* ?Who we trust to use the daemon in safe ways */
+    Setting<Strings> allowedUsers{
+        this, {"*"}, "allowed-users",
+        R"(
+          A list of names of users (separated by whitespace) that are allowed
+          to connect to the Nix daemon. As with the `trusted-users` option,
+          you can specify groups by prefixing them with `@`. Also, you can
+          allow all users by specifying `*`. The default is `*`.
+
+          Note that trusted users are always allowed to connect.
+        )"};
+};
+
+UserSettings userSettings;
+
+static GlobalConfig::Register rSettings(&userSettings);
+
 #ifndef __linux__
 #define SPLICE_F_MOVE 0
 static ssize_t splice(int fd_in, void *off_in, int fd_out, void *off_out, size_t len, unsigned int flags)
@@ -203,8 +240,8 @@ static void daemonLoop()
             struct group * gr = peer.gidKnown ? getgrgid(peer.gid) : 0;
             std::string group = gr ? gr->gr_name : std::to_string(peer.gid);
 
-            Strings trustedUsers = settings.trustedUsers;
-            Strings allowedUsers = settings.allowedUsers;
+            Strings trustedUsers = userSettings.trustedUsers;
+            Strings allowedUsers = userSettings.allowedUsers;
 
             if (matchUser(user, group, trustedUsers))
                 trusted = Trusted;