[oidc] always get issuer/iss from the OIDC Discovery endpoint

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 - Set default errlog level when `APICAST_LOG_LEVEL` is empty [PR #868](https://github.com/3scale/apicast/pull/868)
 - Correct JWT validation according to [RFC 7523 Section 3](https://tools.ietf.org/html/rfc7523#section-3). Like not required `nbf` claim. [THREESCALE-583](https://issues.jboss.org/browse/THREESCALE-583)
+- Mismatch in OIDC issuer when loading configuration through a configuration file [PR #872](https://github.com/3scale/apicast/pull/872)
 
 ## [3.3.0-beta2] - 2018-09-03
 

gateway/src/apicast/configuration_loader/oidc.lua

@@ -19,17 +19,10 @@ end
 
 _M.discovery = require('resty.oidc.discovery').new()
 
-local function load_oidc(issuer)
-    local config = _M.discovery:openid_configuration(issuer)
-    local keys = _M.discovery:jwks(config)
-
-    return { issuer = issuer, config = config, keys = keys }
-end
-
 local function load_service(service)
     if not service or not service.proxy then return nil end
 
-    return load_oidc(service.proxy.oidc_issuer_endpoint)
+    return _M.discovery:call(service.proxy.oidc_issuer_endpoint)
 end
 
 function _M.call(...)

gateway/src/apicast/configuration_loader/remote_v2.lua

@@ -238,15 +238,7 @@ function _M:services()
 end
 
 function _M:oidc_issuer_configuration(service)
-  local config = oidc_discovery.openid_configuration(self, service.oidc.issuer)
-
-  if config then
-    return {
-      config = config,
-      issuer = config.issuer,
-      keys = oidc_discovery.jwks(self, config)
-    }
-  end
+  return oidc_discovery.call(self, service.oidc.issuer)
 end
 
 function _M:config(service, environment, version)

gateway/src/resty/oidc/discovery.lua

@@ -107,4 +107,20 @@ function _M:jwks(configuration)
     end
 end
 
+--- Fetch whole OIDC configuration through OIDC Discovery.
+-- @tparam string issuer URL to the Issuer (without the .well-known/openid-configuration)
+-- @treturn table
+function _M:call(issuer)
+    local http_client = self.http_client
+
+    if not http_client then
+        return nil, 'not initialized'
+    end
+
+    local config, err = _M.openid_configuration(self, issuer)
+    if not config then return nil, err end
+
+    return { config = config, issuer = config.issuer, keys = _M.jwks(self, config) }
+end
+
 return _M

spec/configuration_loader/oidc_spec.lua

@@ -31,7 +31,7 @@ describe('OIDC Configuration loader', function()
     it('gets openid configuration', function()
       local config = {
         services = {
-          { id = 21, proxy = { oidc_issuer_endpoint = 'https://example.com' } },
+          { id = 21, proxy = { oidc_issuer_endpoint = 'https://user:pass@example.com' } },
         }
       }
 
@@ -40,7 +40,7 @@ describe('OIDC Configuration loader', function()
         .respond_with{
           status = 200,
           headers = { content_type = 'application/json' },
-          body = [[{"jwks_uri":"http://example.com/jwks"}]],
+          body = [[{"jwks_uri":"http://example.com/jwks","issuer":"https://example.com"}]],
         }
 
       test_backend
@@ -52,7 +52,7 @@ describe('OIDC Configuration loader', function()
         }
       local oidc = loader.call(cjson.encode(config))
 
-      assert.same([[{"services":[{"id":21,"proxy":{"oidc_issuer_endpoint":"https:\/\/example.com"}}],"oidc":[{"issuer":"https:\/\/example.com","config":{"jwks_uri":"http:\/\/example.com\/jwks"},"keys":{}}]}]], oidc)
+      assert.same([[{"services":[{"id":21,"proxy":{"oidc_issuer_endpoint":"https:\/\/user:pass@example.com"}}],"oidc":[{"issuer":"https:\/\/example.com","config":{"jwks_uri":"http:\/\/example.com\/jwks","issuer":"https:\/\/example.com"},"keys":{}}]}]], oidc)
     end)
   end)
 end)

spec/configuration_loader/remote_v2_spec.lua

@@ -177,7 +177,7 @@ describe('Configuration Remote Loader V2', function()
                   environment = 'sandbox',
                   content = {
                     id = 42, backend_version = 1,
-                    proxy = { oidc_issuer_endpoint = 'http://idp.example.com/auth/realms/foo/' }
+                    proxy = { oidc_issuer_endpoint = 'http://user:pass@idp.example.com/auth/realms/foo/' }
                   }
                 }
               }