Merge pull request from GHSA-qwrj-9hmp-gpxh

* Fix claims verification for access tokens in external IdP setup

Signed-off-by: Haytham Abuelfutuh <haytham@afutuh.com>

* Add another test case for no signature

Signed-off-by: Haytham Abuelfutuh <haytham@afutuh.com>

auth/authzserver/authorize_test.go

@@ -65,9 +65,6 @@ func TestAuthEndpoint(t *testing.T) {
 	})
 }
 
-// #nosec
-const sampleIDToken = `eyJraWQiOiJaNmRtWl9UWGhkdXctalVCWjZ1RUV6dm5oLWpoTk8wWWhlbUI3cWFfTE9jIiwiYWxnIjoiUlMyNTYifQ.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.SJ3BTD_MFcrYvTnql181Ddeb_mOm81z_S7ZKQ6P8mMgWqn94LZ2nG8k8-_odaaNAAT-M1nAFKWqZAQGvliwS1_TsD8_j0cen5zYnGcz2Uu5fFlvoHwuPgy5JYYNOXkXYgPnIb3kNkgXKbkdjS9hdbMfvnPd9rr8v0yzqf0AQBnUe-cPrzY-ZJjvh80IWDZgSjoP244tTYppPkx8UtedJLJZ4tzB7aXlEyoRV-DpmOLfJkAmblRm4OsO1qjwmx3HSIy_T-0PANn-g4AS07rpoMYHRcqncdgcAsVfGxjyWiOg3kbymLqpGlkIZgzmev-TmpoDp0QkUVPOntuiB57GZ6g`
-
 //func TestAuthCallbackEndpoint(t *testing.T) {
 //	originalURL := "http://localhost:8088/oauth2/authorize?client_id=my-client&redirect_uri=http%3A%2F%2Flocalhost%3A3846%2Fcallback&response_type=code&scope=photos+openid+offline&state=some-random-state-foobar&nonce=some-random-nonce&code_challenge=p0v_UR0KrXl4--BpxM2BQa7qIW5k3k4WauBhjmkVQw8&code_challenge_method=S256"
 //	req := httptest.NewRequest(http.MethodGet, originalURL, nil)

auth/authzserver/resource_server.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	jwtgo "github.com/golang-jwt/jwt/v4"
 	"io/ioutil"
 	"mime"
 	"net/http"
@@ -28,17 +29,21 @@ type ResourceServer struct {
 }
 
 func (r ResourceServer) ValidateAccessToken(ctx context.Context, expectedAudience, tokenStr string) (interfaces.IdentityContext, error) {
-	raw, err := r.signatureVerifier.VerifySignature(ctx, tokenStr)
+	_, err := r.signatureVerifier.VerifySignature(ctx, tokenStr)
 	if err != nil {
 		return nil, err
 	}
 
-	claimsRaw := map[string]interface{}{}
-	if err = json.Unmarshal(raw, &claimsRaw); err != nil {
-		return nil, fmt.Errorf("failed to unmarshal user info claim into UserInfo type. Error: %w", err)
+	t, _, err := jwtgo.NewParser().ParseUnverified(tokenStr, jwtgo.MapClaims{})
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse token: %v", err)
+	}
+
+	if err = t.Claims.Valid(); err != nil {
+		return nil, fmt.Errorf("failed to validate token: %v", err)
 	}
 
-	return verifyClaims(sets.NewString(append(r.allowedAudience, expectedAudience)...), claimsRaw)
+	return verifyClaims(sets.NewString(append(r.allowedAudience, expectedAudience)...), t.Claims.(jwtgo.MapClaims))
 }
 
 func doRequest(ctx context.Context, req *http.Request) (*http.Response, error) {

auth/authzserver/resource_server_test.go

@@ -2,6 +2,8 @@ package authzserver
 
 import (
 	"context"
+	"crypto/rand"
+	"crypto/rsa"
 	"encoding/json"
 	"io"
 	"net/http"
@@ -10,6 +12,9 @@ import (
 	"reflect"
 	"strings"
 	"testing"
+	"time"
+
+	"github.com/golang-jwt/jwt/v4"
 
 	"github.com/stretchr/testify/assert"
 
@@ -21,20 +26,20 @@ import (
 	stdlibConfig "github.com/flyteorg/flytestdlib/config"
 )
 
-func newMockResourceServer(t testing.TB) ResourceServer {
+func newMockResourceServer(t testing.TB, publicKey rsa.PublicKey) (resourceServer ResourceServer, closer func()) {
 	ctx := context.Background()
 	dummy := ""
 	serverURL := &dummy
 	hf := func(w http.ResponseWriter, r *http.Request) {
 		if r.URL.Path == "/.well-known/oauth-authorization-server" {
 			w.Header().Set("Content-Type", "application/json")
 			_, err := io.WriteString(w, strings.ReplaceAll(`{
-				"issuer": "https://dev-14186422.okta.com",
+				"issuer": "https://whatever.okta.com",
 				"authorization_endpoint": "https://example.com/auth",
 				"token_endpoint": "https://example.com/token",
-				"jwks_uri": "URL/keys",
+				"jwks_uri": "{URL}/keys",
 				"id_token_signing_alg_values_supported": ["RS256"]
-			}`, "URL", *serverURL))
+			}`, "{URL}", *serverURL))
 
 			if !assert.NoError(t, err) {
 				t.FailNow()
@@ -43,6 +48,14 @@ func newMockResourceServer(t testing.TB) ResourceServer {
 			return
 		} else if r.URL.Path == "/keys" {
 			keys := jwk.NewSet()
+			key := jwk.NewRSAPublicKey()
+			err := key.FromRaw(&publicKey)
+			if err != nil {
+				http.Error(w, err.Error(), 400)
+				return
+			}
+
+			keys.Add(key)
 			raw, err := json.Marshal(keys)
 			if err != nil {
 				http.Error(w, err.Error(), 400)
@@ -55,36 +68,127 @@ func newMockResourceServer(t testing.TB) ResourceServer {
 			if !assert.NoError(t, err) {
 				t.FailNow()
 			}
+
+			return
 		}
 
 		http.NotFound(w, r)
 	}
 
 	s := httptest.NewServer(http.HandlerFunc(hf))
-	defer s.Close()
-
 	*serverURL = s.URL
 
 	http.DefaultClient = s.Client()
 
 	r, err := NewOAuth2ResourceServer(ctx, authConfig.ExternalAuthorizationServer{
-		BaseURL: stdlibConfig.URL{URL: *config.MustParseURL(s.URL)},
+		BaseURL:         stdlibConfig.URL{URL: *config.MustParseURL(s.URL)},
+		AllowedAudience: []string{"https://localhost"},
 	}, stdlibConfig.URL{})
 	if !assert.NoError(t, err) {
 		t.FailNow()
 	}
 
-	return r
-}
-
-func TestNewOAuth2ResourceServer(t *testing.T) {
-	newMockResourceServer(t)
+	return r, func() {
+		s.Close()
+	}
 }
 
 func TestResourceServer_ValidateAccessToken(t *testing.T) {
-	r := newMockResourceServer(t)
-	_, err := r.ValidateAccessToken(context.Background(), "myserver", sampleIDToken)
-	assert.Error(t, err)
+	sampleRSAKey, err := rsa.GenerateKey(rand.Reader, 2048)
+	if !assert.NoError(t, err) {
+		t.FailNow()
+	}
+
+	r, closer := newMockResourceServer(t, sampleRSAKey.PublicKey)
+	defer closer()
+
+	t.Run("No signature", func(t *testing.T) {
+		sampleIDToken, err := jwt.NewWithClaims(jwt.SigningMethodRS512, jwt.RegisteredClaims{
+			Audience:  r.allowedAudience,
+			ExpiresAt: jwt.NewNumericDate(time.Now().Add(time.Hour)),
+			IssuedAt:  jwt.NewNumericDate(time.Now()),
+			Issuer:    "localhost",
+			Subject:   "someone",
+		}).SignedString(sampleRSAKey)
+		if !assert.NoError(t, err) {
+			t.FailNow()
+		}
+
+		parts := strings.Split(sampleIDToken, ".")
+		sampleIDToken = strings.Join(parts[:len(parts)-1], ".") + "."
+
+		_, err = r.ValidateAccessToken(context.Background(), "myserver", sampleIDToken)
+		if !assert.Error(t, err) {
+			t.FailNow()
+		}
+
+		assert.Contains(t, err.Error(), "failed to verify id token signature")
+	})
+
+	t.Run("Invalid signature", func(t *testing.T) {
+		sampleRSAKey, err := rsa.GenerateKey(rand.Reader, 2048)
+		if !assert.NoError(t, err) {
+			t.FailNow()
+		}
+
+		sampleIDToken, err := jwt.NewWithClaims(jwt.SigningMethodRS512, jwt.RegisteredClaims{
+			Audience:  r.allowedAudience,
+			ExpiresAt: jwt.NewNumericDate(time.Now().Add(time.Hour)),
+			IssuedAt:  jwt.NewNumericDate(time.Now()),
+			Issuer:    "localhost",
+			Subject:   "someone",
+		}).SignedString(sampleRSAKey)
+		if !assert.NoError(t, err) {
+			t.FailNow()
+		}
+
+		_, err = r.ValidateAccessToken(context.Background(), "myserver", sampleIDToken)
+		if !assert.Error(t, err) {
+			t.FailNow()
+		}
+
+		assert.Contains(t, err.Error(), "failed to verify id token signature")
+	})
+
+	t.Run("Invalid audience", func(t *testing.T) {
+		sampleIDToken, err := jwt.NewWithClaims(jwt.SigningMethodRS512, jwt.RegisteredClaims{
+			Audience:  []string{"https://hello world"},
+			ExpiresAt: jwt.NewNumericDate(time.Now().Add(time.Hour)),
+			IssuedAt:  jwt.NewNumericDate(time.Now()),
+			Issuer:    "localhost",
+			Subject:   "someone",
+		}).SignedString(sampleRSAKey)
+		if !assert.NoError(t, err) {
+			t.FailNow()
+		}
+
+		_, err = r.ValidateAccessToken(context.Background(), "myserver", sampleIDToken)
+		if !assert.Error(t, err) {
+			t.FailNow()
+		}
+
+		assert.Contains(t, err.Error(), "invalid audience")
+	})
+
+	t.Run("Expired token", func(t *testing.T) {
+		sampleIDToken, err := jwt.NewWithClaims(jwt.SigningMethodRS512, jwt.StandardClaims{
+			Audience:  r.allowedAudience[0],
+			ExpiresAt: time.Now().Add(-time.Hour).Unix(),
+			IssuedAt:  time.Now().Add(-2 * time.Hour).Unix(),
+			Issuer:    "localhost",
+			Subject:   "someone",
+		}).SignedString(sampleRSAKey)
+		if !assert.NoError(t, err) {
+			t.FailNow()
+		}
+
+		_, err = r.ValidateAccessToken(context.Background(), "myserver", sampleIDToken)
+		if !assert.Error(t, err) {
+			t.FailNow()
+		}
+
+		assert.Contains(t, err.Error(), "failed to validate token: Token is expired")
+	})
 }
 
 func Test_doRequest(t *testing.T) {