return a clean error if pem_decode fails

src/jwtf/src/jwtf_keystore.erl

@@ -141,12 +141,17 @@ get_from_config(Kty, KID) ->
 
 pem_decode(PEM) ->
     BinPEM = re:replace(PEM, "\\\\n", "\n", [global, {return, binary}]),
-    case public_key:pem_decode(BinPEM) of
-        [PEMEntry] ->
-            public_key:pem_entry_decode(PEMEntry);
-        [] ->
-            throw({bad_request, <<"Not a valid key">>})
-    end.
+    try
+        case public_key:pem_decode(BinPEM) of
+            [PEMEntry] ->
+                public_key:pem_entry_decode(PEMEntry);
+            _ ->
+                throw({bad_request, <<"Not a valid key">>})
+        end
+   catch
+       error:_ ->
+           throw({bad_request, <<"Not a valid key">>})
+   end.
 
 kty(<<"HS", _/binary>>) ->
     "hmac";

src/jwtf/test/jwtf_keystore_tests.erl

@@ -17,6 +17,8 @@
 
 -define(HMAC_SECRET, "aGVsbG8=").
 -define(RSA_SECRET, "-----BEGIN PUBLIC KEY-----\\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAztanwQtIx0sms+x7m1SF\\nh7EHJHkM2biTJ41jR89FsDE2gd3MChpaqxemS5GpNvfFKRvuHa4PUZ3JtRCBG1KM\\n/7EWIVTy1JQDr2mb8couGlQNqz4uXN2vkNQ0XszgjU4Wn6ZpvYxmqPFbmkRe8QSn\\nAy2Wf8jQgjsbez8eaaX0G9S1hgFZUN3KFu7SVmUDQNvWpQdaJPP+ms5Z0CqF7JLa\\nvJmSdsU49nlYw9VH/XmwlUBMye6HgR4ZGCLQS85frqF0xLWvi7CsMdchcIjHudXH\\nQK1AumD/VVZVdi8Q5Qew7F6VXeXqnhbw9n6Px25cCuNuh6u5+E6GUzXRrMpqo9vO\\nqQIDAQAB\\n-----END PUBLIC KEY-----\\n").
+-define(BAD_RSA_SECRET,"-----BEGIN PUBLIC KEY-----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\\n4mRBKB+GsQ==\\n-----END PUBLIC KEY-----\\n").
+
 -define(EC_SECRET, "-----BEGIN PUBLIC KEY-----\\nMHYwEAYHKoZIzj0CAQYFK4EEACIDYgAEDsr0lz/Dg3luarb+Kua0Wcj9WrfR23os\\nwHzakglb8GhWRDn+oZT0Bt/26sX8uB4/ij9PEOLHPo+IHBtX4ELFFVr5GTzlqcJe\\nyctaTDd1OOAPXYuc67EWtGZ3pDAzztRs\\n-----END PUBLIC KEY-----\\n").
 
 setup() ->
@@ -31,7 +33,10 @@ setup() ->
 
     config:set("jwt_keys", "hmac:ec", ?EC_SECRET),
     config:set("jwt_keys", "rsa:ec", ?EC_SECRET),
-    config:set("jwt_keys", "ec:ec", ?EC_SECRET).
+    config:set("jwt_keys", "ec:ec", ?EC_SECRET),
+
+    config:set("jwt_keys", "rsa:badrsa", ?BAD_RSA_SECRET).
+
 
 teardown(_) ->
     test_util:stop_applications([config, jwtf]).
@@ -52,6 +57,8 @@ jwtf_keystore_test_() ->
 
       ?_assertThrow({bad_request, _},  jwtf_keystore:get(<<"HS256">>, <<"ec">>)),
       ?_assertThrow({bad_request, _},  jwtf_keystore:get(<<"RS256">>, <<"ec">>)),
-      ?_assertMatch({#'ECPoint'{}, _}, jwtf_keystore:get(<<"ES256">>, <<"ec">>))
+      ?_assertMatch({#'ECPoint'{}, _}, jwtf_keystore:get(<<"ES256">>, <<"ec">>)),
+
+      ?_assertThrow({bad_request, <<"Not a valid key">>}, jwtf_keystore:get(<<"RS256">>, <<"badrsa">>))
      ]
     }.