fix(handlers): send status 303 auth requests that are not get/head (#2184)

When a request occurs, if the browser is not performing a HTTP GET/HEAD request, the 302 status code is not valid. This commit resolves this. MDN: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/302.

internal/handlers/handler_verify.go

@@ -228,8 +228,15 @@ func handleUnauthorized(ctx *middlewares.AutheliaCtx, targetURL fmt.Stringer, is
 		}
 
 		ctx.Logger.Infof("Access to %s (method %s) is not authorized to user %s, redirecting to %s", targetURL.String(), friendlyMethod, friendlyUsername, redirectionURL)
-		ctx.Redirect(redirectionURL, 302)
+
-		ctx.SetBodyString(fmt.Sprintf("Found. Redirecting to %s", redirectionURL))
+		switch rm {
+		case fasthttp.MethodGet, fasthttp.MethodHead, "":
+			ctx.Redirect(redirectionURL, 302)
+			ctx.SetBodyString(fmt.Sprintf("Found. Redirecting to %s", redirectionURL))
+		default:
+			ctx.Redirect(redirectionURL, 303)
+			ctx.SetBodyString(fmt.Sprintf("See Other. Redirecting to %s", redirectionURL))
+		}
 	} else {
 		ctx.Logger.Infof("Access to %s (method %s) is not authorized to user %s, sending 401 response", targetURL.String(), friendlyMethod, friendlyUsername)
 		ctx.ReplyUnauthorized()

internal/handlers/handler_verify_test.go

@@ -730,6 +730,31 @@ func TestShouldRedirectWhenSessionInactiveForTooLongAndRDParamProvided(t *testin
 	assert.Equal(t, clock.Now().Unix(), newUserSession.LastActivity)
 }
 
+func TestShouldRedirectWithCorrectStatusCodeBasedOnRequestMethod(t *testing.T) {
+	mock := mocks.NewMockAutheliaCtx(t)
+	defer mock.Close()
+
+	mock.Ctx.QueryArgs().Add("rd", "https://login.example.com")
+	mock.Ctx.Request.Header.Set("X-Original-URL", "https://two-factor.example.com")
+	mock.Ctx.Request.Header.Set("X-Forwarded-Method", "GET")
+
+	VerifyGet(verifyGetCfg)(mock.Ctx)
+
+	assert.Equal(t, "Found. Redirecting to https://login.example.com?rd=https%3A%2F%2Ftwo-factor.example.com&rm=GET",
+		string(mock.Ctx.Response.Body()))
+	assert.Equal(t, 302, mock.Ctx.Response.StatusCode())
+
+	mock.Ctx.QueryArgs().Add("rd", "https://login.example.com")
+	mock.Ctx.Request.Header.Set("X-Original-URL", "https://two-factor.example.com")
+	mock.Ctx.Request.Header.Set("X-Forwarded-Method", "POST")
+
+	VerifyGet(verifyGetCfg)(mock.Ctx)
+
+	assert.Equal(t, "See Other. Redirecting to https://login.example.com?rd=https%3A%2F%2Ftwo-factor.example.com&rm=POST",
+		string(mock.Ctx.Response.Body()))
+	assert.Equal(t, 303, mock.Ctx.Response.StatusCode())
+}
+
 func TestShouldUpdateInactivityTimestampEvenWhenHittingForbiddenResources(t *testing.T) {
 	mock := mocks.NewMockAutheliaCtx(t)
 	defer mock.Close()

internal/suites/suite_standalone_test.go

@@ -128,6 +128,36 @@ func (s *StandaloneSuite) TestShouldRespectMethodsACL() {
 	s.Assert().Equal(res.StatusCode, 200)
 }
 
+func (s *StandaloneSuite) TestShouldRespondWithCorrectStatusCode() {
+	req, err := http.NewRequest("GET", fmt.Sprintf("%s/api/verify?rd=%s", AutheliaBaseURL, GetLoginBaseURL()), nil)
+	s.Assert().NoError(err)
+	req.Header.Set("X-Forwarded-Method", "GET")
+	req.Header.Set("X-Forwarded-Proto", "https")
+	req.Header.Set("X-Forwarded-Host", fmt.Sprintf("secure.%s", BaseDomain))
+	req.Header.Set("X-Forwarded-URI", "/")
+
+	client := NewHTTPClient()
+	res, err := client.Do(req)
+	s.Assert().NoError(err)
+	s.Assert().Equal(res.StatusCode, 302)
+	body, err := ioutil.ReadAll(res.Body)
+	s.Assert().NoError(err)
+
+	urlEncodedAdminURL := url.QueryEscape(SecureBaseURL + "/")
+	s.Assert().Equal(fmt.Sprintf("Found. Redirecting to %s?rd=%s&rm=GET", GetLoginBaseURL(), urlEncodedAdminURL), string(body))
+
+	req.Header.Set("X-Forwarded-Method", "POST")
+
+	res, err = client.Do(req)
+	s.Assert().NoError(err)
+	s.Assert().Equal(res.StatusCode, 303)
+	body, err = ioutil.ReadAll(res.Body)
+	s.Assert().NoError(err)
+
+	urlEncodedAdminURL = url.QueryEscape(SecureBaseURL + "/")
+	s.Assert().Equal(fmt.Sprintf("See Other. Redirecting to %s?rd=%s&rm=POST", GetLoginBaseURL(), urlEncodedAdminURL), string(body))
+}
+
 // Standard case using nginx.
 func (s *StandaloneSuite) TestShouldVerifyAPIVerifyUnauthorize() {
 	req, err := http.NewRequest("GET", fmt.Sprintf("%s/api/verify", AutheliaBaseURL), nil)