fix: allow for exp field to optional to keep backwards compat with 4.X

CHANGES-5.0.md

@@ -5,6 +5,7 @@
 * Websocket listener failed to read headers `X-Forwared-For` and `X-Forwarded-Port` [8415](https://github.com/emqx/emqx/pull/8415)
 * Deleted `cluster_singleton` from MQTT bridge config document. This config is no longer applicable in 5.0 [8407](https://github.com/emqx/emqx/pull/8407)
 * Fix `emqx/emqx:latest` docker image publish to use the Erlang flavor, but not Elixir flavor [8414](https://github.com/emqx/emqx/pull/8414)
+* Changed the `exp` field in JWT auth to be optional rather than required to fix backwards compatability with 4.X releases. [8425](https://github.com/emqx/emqx/pull/8425)
 
 # 5.0.2
 
@@ -14,14 +15,14 @@ Going forward, it will be an enterprise only feature.
 Main reason: relup requires carefully crafted upgrade instructions from ALL previous versions.
 
 For example, 4.3 is now at 4.3.16, we have `4.3.0->4.3.16`, `4.3.1->4.3.16`, ... 16 such upgrade paths in total to maintain.
-This had been the biggest obstacle for EMQX team to act agile enought in deliverying enhancements and fixes.
+This had been the biggest obstacle for EMQX team to act agile enough in deliverying enhancements and fixes.
 
 ## Enhancements
 
 ## Bug fixes
 
 * Fixed a typo in `bin/emqx` which affects MacOs release when trying to enable Erlang distribution over TLS [8398](https://github.com/emqx/emqx/pull/8398)
-* Ristricted shell was accidentally disabled in 5.0.1, it has been added back. [8396]{https://github.com/emqx/emqx/pull/8396)
+* Restricted shell was accidentally disabled in 5.0.1, it has been added back. [8396](https://github.com/emqx/emqx/pull/8396)
 
 # 5.0.1
 

apps/emqx_authn/src/emqx_authn.app.src

@@ -1,7 +1,7 @@
 %% -*- mode: erlang -*-
 {application, emqx_authn, [
     {description, "EMQX Authentication"},
-    {vsn, "0.1.1"},
+    {vsn, "0.1.2"},
     {modules, []},
     {registered, [emqx_authn_sup, emqx_authn_registry]},
     {applications, [kernel, stdlib, emqx_resource, ehttpc, epgsql, mysql, jose]},

apps/emqx_authn/src/emqx_authn.appup.src

@@ -1,13 +1,5 @@
 %% -*- mode: erlang -*-
 %% Unless you know what you are doing, DO NOT edit manually!!
 {VSN,
-  [{"0.1.0",
-    [{load_module,emqx_authn_http,brutal_purge,soft_purge,[]},
-     {load_module,emqx_authn_utils,brutal_purge,soft_purge,[]},
-     {load_module,emqx_authn_redis,brutal_purge,soft_purge,[]}]},
-   {<<".*">>,[]}],
-  [{"0.1.0",
-    [{load_module,emqx_authn_http,brutal_purge,soft_purge,[]},
-     {load_module,emqx_authn_utils,brutal_purge,soft_purge,[]},
-     {load_module,emqx_authn_redis,brutal_purge,soft_purge,[]}]},
-   {<<".*">>,[]}]}.
+  [{<<".*">>,[]}],
+  [{<<".*">>,[]}]}.

apps/emqx_authn/src/simple_authn/emqx_authn_jwt.erl

@@ -380,7 +380,9 @@ replace_placeholder([{Name, {placeholder, PL}} | More], Variables, Acc) ->
     Value = maps:get(PL, Variables),
     replace_placeholder(More, Variables, [{Name, Value} | Acc]);
 replace_placeholder([{Name, Value} | More], Variables, Acc) ->
-    replace_placeholder(More, Variables, [{Name, Value} | Acc]).
+    replace_placeholder(More, Variables, [{Name, Value} | Acc]);
+replace_placeholder([{_Name, _Required, _Fun} = Claim | More], Variables, Acc) ->
+    replace_placeholder(More, Variables, [Claim | Acc]).
 
 verify(undefined, _, _, _) ->
     ignore;
@@ -432,7 +434,7 @@ verify_claims(Claims, VerifyClaims0) ->
     Now = os:system_time(seconds),
     VerifyClaims =
         [
-            {<<"exp">>, required, fun(ExpireTime) ->
+            {<<"exp">>, optional, fun(ExpireTime) ->
                 is_integer(ExpireTime) andalso Now < ExpireTime
             end},
             {<<"iat">>, optional, fun(IssueAt) ->
@@ -528,7 +530,9 @@ handle_verify_claims([], Acc) ->
     Acc;
 handle_verify_claims([{Name, Expected0} | More], Acc) ->
     Expected = handle_placeholder(Expected0),
-    handle_verify_claims(More, [{Name, Expected} | Acc]).
+    handle_verify_claims(More, [{Name, Expected} | Acc]);
+handle_verify_claims([{_Name, _Required, _Fun} = Claim | More], Acc) ->
+    handle_verify_claims(More, [Claim | Acc]).
 
 handle_placeholder(Placeholder0) ->
     case re:run(Placeholder0, "^\\$\\{[a-z0-9\\-]+\\}$", [{capture, all}]) of

apps/emqx_authn/test/emqx_authn_jwt_SUITE.erl

@@ -399,7 +399,27 @@ t_verify_claims(_) ->
     },
     ?assertMatch({ok, #{is_superuser := false}}, emqx_authn_jwt:authenticate(Credential3, State1)),
 
-    %% No exp
+    %% No exp treated as unexpired
+    Payload4 = #{<<"username">> => <<"myuser">>, <<"foo">> => <<"myuser">>},
+    JWS4 = generate_jws('hmac-based', Payload4, Secret),
+    Credential4 = #{
+        username => <<"myuser">>,
+        password => JWS4
+    },
+    ?assertMatch(
+        {ok, #{is_superuser := false}}, emqx_authn_jwt:authenticate(Credential4, State1)
+    ),
+
+    %% No exp when required
+    Now = os:system_time(seconds),
+    Config2 = Config1#{
+        verify_claims => [
+            {<<"exp">>, required, fun(ExpireTime) ->
+                is_integer(ExpireTime) andalso Now < ExpireTime
+            end}
+        ]
+    },
+    {ok, State2} = emqx_authn_jwt:update(Config2, State1),
     Payload4 = #{<<"username">> => <<"myuser">>, <<"foo">> => <<"myuser">>},
     JWS4 = generate_jws('hmac-based', Payload4, Secret),
     Credential4 = #{
@@ -407,7 +427,7 @@ t_verify_claims(_) ->
         password => JWS4
     },
     ?assertEqual(
-        {error, bad_username_or_password}, emqx_authn_jwt:authenticate(Credential4, State1)
+        {error, bad_username_or_password}, emqx_authn_jwt:authenticate(Credential4, State2)
     ).
 
 t_jwt_not_allow_empty_claim_name(_) ->