Merge pull request #775 from xeonx/master

Allow CORS on keys and token endpoints

cmd/dex/config.go

@@ -103,7 +103,7 @@ type Web struct {
 	HTTPS          string   `json:"https"`
 	TLSCert        string   `json:"tlsCert"`
 	TLSKey         string   `json:"tlsKey"`
-	DiscoveryAllowedOrigins []string `json:"discoveryAllowedOrigins"`
+	AllowedOrigins []string `json:"allowedOrigins"`
 }
 
 // GRPC is the config for the gRPC API.

cmd/dex/serve.go

@@ -179,8 +179,8 @@ func serve(cmd *cobra.Command, args []string) error {
 	if c.OAuth2.SkipApprovalScreen {
 		logger.Infof("config skipping approval screen")
 	}
-	if len(c.Web.DiscoveryAllowedOrigins) > 0 {
+	if len(c.Web.AllowedOrigins) > 0 {
-		logger.Infof("config discovery allowed origins: %s", c.Web.DiscoveryAllowedOrigins)
+		logger.Infof("config allowed origins: %s", c.Web.AllowedOrigins)
 	}
 
 	// explicitly convert to UTC.
@@ -189,7 +189,7 @@ func serve(cmd *cobra.Command, args []string) error {
 	serverConfig := server.Config{
 		SupportedResponseTypes: c.OAuth2.ResponseTypes,
 		SkipApprovalScreen:     c.OAuth2.SkipApprovalScreen,
-		DiscoveryAllowedOrigins: c.Web.DiscoveryAllowedOrigins,
+		AllowedOrigins:         c.Web.AllowedOrigins,
 		Issuer:                 c.Issuer,
 		Connectors:             connectors,
 		Storage:                s,

server/handlers.go

@@ -12,7 +12,6 @@ import (
 	"strings"
 	"time"
 
-	"github.com/gorilla/handlers"
 	"github.com/gorilla/mux"
 	jose "gopkg.in/square/go-jose.v2"
 
@@ -104,7 +103,7 @@ type discovery struct {
 	Claims        []string `json:"claims_supported"`
 }
 
-func (s *Server) discoveryHandler() (http.Handler, error) {
+func (s *Server) discoveryHandler() (http.HandlerFunc, error) {
 	d := discovery{
 		Issuer:      s.issuerURL.String(),
 		Auth:        s.absURL("/auth"),
@@ -130,18 +129,11 @@ func (s *Server) discoveryHandler() (http.Handler, error) {
 		return nil, fmt.Errorf("failed to marshal discovery data: %v", err)
 	}
 
-	var discoveryHandler http.Handler
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-	discoveryHandler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.Header().Set("Content-Type", "application/json")
 		w.Header().Set("Content-Length", strconv.Itoa(len(data)))
 		w.Write(data)
-	})
+	}), nil
-	if len(s.discoveryAllowedOrigins) > 0 {
-		corsOption := handlers.AllowedOrigins(s.discoveryAllowedOrigins)
-		discoveryHandler = handlers.CORS(corsOption)(discoveryHandler)
-	}
-
-	return discoveryHandler, nil
 }
 
 // handleAuthorization handles the OAuth2 auth endpoint.

server/handlers_test.go

@@ -22,61 +22,3 @@ func TestHandleHealth(t *testing.T) {
 	}
 
 }
-
-var discoveryHandlerCORSTests = []struct {
-	DiscoveryAllowedOrigins []string
-	Origin                  string
-	ResponseAllowOrigin     string //The expected response: same as Origin in case of valid CORS flow
-}{
-	{nil, "http://foo.example", ""}, //Default behavior: cross origin requests not allowed
-	{[]string{}, "http://foo.example", ""},
-	{[]string{"http://foo.example"}, "http://foo.example", "http://foo.example"},
-	{[]string{"http://bar.example", "http://foo.example"}, "http://foo.example", "http://foo.example"},
-	{[]string{"*"}, "http://foo.example", "http://foo.example"},
-	{[]string{"http://bar.example"}, "http://foo.example", ""},
-}
-
-func TestDiscoveryHandlerCORS(t *testing.T) {
-	ctx, cancel := context.WithCancel(context.Background())
-	defer cancel()
-
-	for _, testcase := range discoveryHandlerCORSTests {
-
-		httpServer, server := newTestServer(ctx, t, func(c *Config) {
-			c.DiscoveryAllowedOrigins = testcase.DiscoveryAllowedOrigins
-		})
-		defer httpServer.Close()
-
-		discoveryHandler, err := server.discoveryHandler()
-		if err != nil {
-			t.Fatalf("failed to get discovery handler: %v", err)
-		}
-
-		//Perform preflight request
-		rrPreflight := httptest.NewRecorder()
-		reqPreflight := httptest.NewRequest("OPTIONS", "/.well-kown/openid-configuration", nil)
-		reqPreflight.Header.Set("Origin", testcase.Origin)
-		reqPreflight.Header.Set("Access-Control-Request-Method", "GET")
-		discoveryHandler.ServeHTTP(rrPreflight, reqPreflight)
-		if rrPreflight.Code != http.StatusOK {
-			t.Errorf("expected 200 got %d", rrPreflight.Code)
-		}
-		headerAccessControlPreflight := rrPreflight.HeaderMap.Get("Access-Control-Allow-Origin")
-		if headerAccessControlPreflight != testcase.ResponseAllowOrigin {
-			t.Errorf("expected '%s' got '%s'", testcase.ResponseAllowOrigin, headerAccessControlPreflight)
-		}
-
-		//Perform request
-		rr := httptest.NewRecorder()
-		req := httptest.NewRequest("GET", "/.well-kown/openid-configuration", nil)
-		req.Header.Set("Origin", testcase.Origin)
-		discoveryHandler.ServeHTTP(rr, req)
-		if rr.Code != http.StatusOK {
-			t.Errorf("expected 200 got %d", rr.Code)
-		}
-		headerAccessControl := rr.HeaderMap.Get("Access-Control-Allow-Origin")
-		if headerAccessControl != testcase.ResponseAllowOrigin {
-			t.Errorf("expected '%s' got '%s'", testcase.ResponseAllowOrigin, headerAccessControl)
-		}
-	}
-}

server/server.go

@@ -13,6 +13,7 @@ import (
 	"golang.org/x/net/context"
 
 	"github.com/Sirupsen/logrus"
+	"github.com/gorilla/handlers"
 	"github.com/gorilla/mux"
 
 	"github.com/coreos/dex/connector"
@@ -42,10 +43,10 @@ type Config struct {
 	// flow. If no response types are supplied this value defaults to "code".
 	SupportedResponseTypes []string
 
-	// List of allowed origins for CORS requests on discovery endpoint.
+	// List of allowed origins for CORS requests on discovery, token and keys endpoint.
 	// If none are indicated, CORS requests are disabled. Passing in "*" will allow any
 	// domain.
-	DiscoveryAllowedOrigins []string
+	AllowedOrigins []string
 
 	// If enabled, the server won't prompt the user to approve authorization requests.
 	// Logging in implies approval.
@@ -116,8 +117,6 @@ type Server struct {
 
 	supportedResponseTypes map[string]bool
 
-	discoveryAllowedOrigins []string
-
 	now func() time.Time
 
 	idTokensValidFor time.Duration
@@ -189,7 +188,6 @@ func newServer(ctx context.Context, c Config, rotationStrategy rotationStrategy)
 		connectors:             make(map[string]Connector),
 		storage:                newKeyCacher(c.Storage, now),
 		supportedResponseTypes: supported,
-		discoveryAllowedOrigins: c.DiscoveryAllowedOrigins,
 		idTokensValidFor:       value(c.IDTokensValidFor, 24*time.Hour),
 		skipApproval:           c.SkipApprovalScreen,
 		now:                    now,
@@ -205,24 +203,29 @@ func newServer(ctx context.Context, c Config, rotationStrategy rotationStrategy)
 	handleFunc := func(p string, h http.HandlerFunc) {
 		r.HandleFunc(path.Join(issuerURL.Path, p), h)
 	}
-	handle := func(p string, h http.Handler) {
-		r.Handle(path.Join(issuerURL.Path, p), h)
-	}
 	handlePrefix := func(p string, h http.Handler) {
 		prefix := path.Join(issuerURL.Path, p)
 		r.PathPrefix(prefix).Handler(http.StripPrefix(prefix, h))
 	}
+	handleWithCORS := func(p string, h http.HandlerFunc) {
+		var handler http.Handler = h
+		if len(c.AllowedOrigins) > 0 {
+			corsOption := handlers.AllowedOrigins(c.AllowedOrigins)
+			handler = handlers.CORS(corsOption)(handler)
+		}
+		r.Handle(path.Join(issuerURL.Path, p), handler)
+	}
 	r.NotFoundHandler = http.HandlerFunc(http.NotFound)
 
 	discoveryHandler, err := s.discoveryHandler()
 	if err != nil {
 		return nil, err
 	}
-	handle("/.well-known/openid-configuration", discoveryHandler)
+	handleWithCORS("/.well-known/openid-configuration", discoveryHandler)
 
 	// TODO(ericchiang): rate limit certain paths based on IP.
-	handleFunc("/token", s.handleToken)
+	handleWithCORS("/token", s.handleToken)
-	handleFunc("/keys", s.handlePublicKeys)
+	handleWithCORS("/keys", s.handlePublicKeys)
 	handleFunc("/auth", s.handleAuthorization)
 	handleFunc("/auth/{connector}", s.handleConnectorLogin)
 	handleFunc("/callback", s.handleConnectorCallback)