tests: Add a basic test for require-same-user D-Bus auth flag

It’s not feasible to test that the require-same-user flag can cause
authentication to fail, as that would require the build environment to
have two users available. We can, however, test that it passes when
authenticating a client and server running under the same user account.

I have manually tested that the new flag works, by running the following
as user A:
```
`$prefix/gdbus-daemon --print-env &`
gdbus call --session --dest org.freedesktop.DBus --object-path /org/freedesktop/DBus --method org.freedesktop.DBus.ListNames
```

And then running the `gdbus call` command again as user B (with the same
value for `DBUS_SESSION_BUS_ADDRESS` in the environment), which
produces:
```
Error connecting: Unexpected lack of content trying to read a line
```
(an authentication rejection)

Commenting out the use of
`G_DBUS_SERVER_FLAGS_AUTHENTICATION_REQUIRE_SAME_USER` from
`gdbusdaemon.c`, the `gdbus call` command succeeds for both users.

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/gio/tests/gdbus-server-auth.c b/gio/tests/gdbus-server-auth.c
index b3ee8aab2..bd1443eb1 100644
--- a/gio/tests/gdbus-server-auth.c
+++ b/gio/tests/gdbus-server-auth.c
@@ -37,6 +37,7 @@ typedef enum
   INTEROP_FLAGS_TCP = (1 << 3),
   INTEROP_FLAGS_LIBDBUS = (1 << 4),
   INTEROP_FLAGS_ABSTRACT = (1 << 5),
+  INTEROP_FLAGS_REQUIRE_SAME_USER = (1 << 6),
   INTEROP_FLAGS_NONE = 0
 } InteropFlags;
 
@@ -325,6 +326,8 @@ do_test_server_auth (InteropFlags flags)
 
   if (flags & INTEROP_FLAGS_ANONYMOUS)
     server_flags |= G_DBUS_SERVER_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS;
+  if (flags & INTEROP_FLAGS_REQUIRE_SAME_USER)
+    server_flags |= G_DBUS_SERVER_FLAGS_AUTHENTICATION_REQUIRE_SAME_USER;
 
   observer = g_dbus_auth_observer_new ();
 
@@ -514,6 +517,12 @@ test_server_auth_external (void)
 }
 
 static void
+test_server_auth_external_require_same_user (void)
+{
+  do_test_server_auth (INTEROP_FLAGS_EXTERNAL | INTEROP_FLAGS_REQUIRE_SAME_USER);
+}
+
+static void
 test_server_auth_sha1 (void)
 {
   do_test_server_auth (INTEROP_FLAGS_SHA1);
@@ -537,6 +546,7 @@ main (int   argc,
   g_test_add_func ("/gdbus/server-auth/anonymous", test_server_auth_anonymous);
   g_test_add_func ("/gdbus/server-auth/anonymous/tcp", test_server_auth_anonymous_tcp);
   g_test_add_func ("/gdbus/server-auth/external", test_server_auth_external);
+  g_test_add_func ("/gdbus/server-auth/external/require-same-user", test_server_auth_external_require_same_user);
   g_test_add_func ("/gdbus/server-auth/sha1", test_server_auth_sha1);
   g_test_add_func ("/gdbus/server-auth/sha1/tcp", test_server_auth_sha1_tcp);