Prevent internal authN backend from accepting blank passwords

Passwordless users were never meant to be used this way. Since
the EXTERNAL authentication mechanism won't use this backend at all,
this is a reasonable safeguard to put in place.

[#153435857]

(cherry picked from commit bd40475057446c841c9531515d452df532841ec0)

1 files changed, 58 insertions, 1 deletions

diff --git a/test/unit_inbroker_parallel_SUITE.erl b/test/unit_inbroker_parallel_SUITE.erl
index 89fd8fc659..c4c8740b7a 100644
--- a/test/unit_inbroker_parallel_SUITE.erl
+++ b/test/unit_inbroker_parallel_SUITE.erl
@@ -19,6 +19,7 @@
 -include_lib("common_test/include/ct.hrl").
 -include_lib("kernel/include/file.hrl").
 -include_lib("amqp_client/include/amqp_client.hrl").
+-include_lib("eunit/include/eunit.hrl").
 
 -compile(export_all).
 
@@ -49,6 +50,10 @@ groups() ->
               password_hashing,
               change_password
             ]},
+          {auth_backend_internal, [parallel], [
+              login_with_credentials_but_no_password,
+              login_of_passwordless_user
+            ]},
           set_disk_free_limit_command,
           set_vm_memory_high_watermark_command,
           topic_matching,
@@ -517,6 +522,58 @@ change_password1(_Config) ->
             UserName, [{password, Password}]),
     passed.
 
+
+%% -------------------------------------------------------------------
+%% rabbit_auth_backend_internal
+%% -------------------------------------------------------------------
+
+login_with_credentials_but_no_password(Config) ->
+    passed = rabbit_ct_broker_helpers:rpc(Config, 0,
+      ?MODULE, login_with_credentials_but_no_password1, [Config]).
+
+login_with_credentials_but_no_password1(_Config) ->
+    Username = <<"login_with_credentials_but_no_password-user">>,
+    Password = <<"login_with_credentials_but_no_password-password">>,
+    ok = rabbit_auth_backend_internal:add_user(Username, Password, <<"acting-user">>),
+
+    try
+        rabbit_auth_backend_internal:user_login_authentication(Username,
+                                                              [{key, <<"value">>}]),
+        ?assert(false)
+    catch exit:{unknown_auth_props, Username, [{key, <<"value">>}]} ->
+            ok
+    end,
+
+    ok = rabbit_auth_backend_internal:delete_user(Username, <<"acting-user">>),
+
+    passed.
+
+%% passwordless users are not supposed to be used with
+%% this backend (and PLAIN authentication mechanism in general)
+login_of_passwordless_user(Config) ->
+    passed = rabbit_ct_broker_helpers:rpc(Config, 0,
+      ?MODULE, login_of_passwordless_user1, [Config]).
+
+login_of_passwordless_user1(_Config) ->
+    Username = <<"login_of_passwordless_user-user">>,
+    Password = <<"">>,
+    ok = rabbit_auth_backend_internal:add_user(Username, Password, <<"acting-user">>),
+
+    ?assertMatch(
+       {refused, _Message, [Username]},
+       rabbit_auth_backend_internal:user_login_authentication(Username,
+                                                              [{password, <<"">>}])),
+
+    ?assertMatch(
+       {refused, _Format, [Username]},
+       rabbit_auth_backend_internal:user_login_authentication(Username,
+                                                              [{password, ""}])),
+
+    ok = rabbit_auth_backend_internal:delete_user(Username, <<"acting-user">>),
+
+    passed.
+
+
 %% -------------------------------------------------------------------
 %% rabbitmqctl.
 %% -------------------------------------------------------------------
@@ -1220,4 +1277,4 @@ expand_options(As, Bs) ->
 flush() ->
     receive _ -> flush()
     after 10 -> ok
-    end.
\ No newline at end of file
+    end.