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dex/server/refreshhandlers.go

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package server
import (
"context"
"errors"
"fmt"
"net/http"
"strings"
"time"
"github.com/dexidp/dex/connector"
"github.com/dexidp/dex/server/internal"
"github.com/dexidp/dex/storage"
)
func contains(arr []string, item string) bool {
for _, itemFromArray := range arr {
if itemFromArray == item {
return true
}
}
return false
}
type refreshError struct {
msg string
code int
desc string
}
func newInternalServerError() *refreshError {
return &refreshError{msg: errInvalidRequest, desc: "", code: http.StatusInternalServerError}
}
func newBadRequestError(desc string) *refreshError {
return &refreshError{msg: errInvalidRequest, desc: desc, code: http.StatusBadRequest}
}
func (s *Server) refreshTokenErrHelper(w http.ResponseWriter, err *refreshError) {
s.tokenErrHelper(w, err.msg, err.desc, err.code)
}
func (s *Server) extractRefreshTokenFromRequest(r *http.Request) (*internal.RefreshToken, *refreshError) {
code := r.PostFormValue("refresh_token")
if code == "" {
return nil, newBadRequestError("No refresh token is found in request.")
}
token := new(internal.RefreshToken)
if err := internal.Unmarshal(code, token); err != nil {
// For backward compatibility, assume the refresh_token is a raw refresh token ID
// if it fails to decode.
//
// Because refresh_token values that aren't unmarshable were generated by servers
// that don't have a Token value, we'll still reject any attempts to claim a
// refresh_token twice.
token = &internal.RefreshToken{RefreshId: code, Token: ""}
}
return token, nil
}
// getRefreshTokenFromStorage checks that refresh token is valid and exists in the storage and gets its info
func (s *Server) getRefreshTokenFromStorage(clientID string, token *internal.RefreshToken) (*storage.RefreshToken, *refreshError) {
invalidErr := newBadRequestError("Refresh token is invalid or has already been claimed by another client.")
refresh, err := s.storage.GetRefresh(token.RefreshId)
if err != nil {
if err != storage.ErrNotFound {
s.logger.Errorf("failed to get refresh token: %v", err)
return nil, newInternalServerError()
}
return nil, invalidErr
}
if refresh.ClientID != clientID {
s.logger.Errorf("client %s trying to claim token for client %s", clientID, refresh.ClientID)
// According to https://datatracker.ietf.org/doc/html/rfc6749#section-5.2 Dex should respond with an
// invalid grant error if token has already been claimed by another client.
return nil, &refreshError{msg: errInvalidGrant, desc: invalidErr.desc, code: http.StatusBadRequest}
}
if refresh.Token != token.Token {
switch {
case !s.refreshTokenPolicy.AllowedToReuse(refresh.LastUsed):
fallthrough
case refresh.ObsoleteToken != token.Token:
fallthrough
case refresh.ObsoleteToken == "":
s.logger.Errorf("refresh token with id %s claimed twice", refresh.ID)
return nil, invalidErr
}
}
expiredErr := newBadRequestError("Refresh token expired.")
if s.refreshTokenPolicy.CompletelyExpired(refresh.CreatedAt) {
s.logger.Errorf("refresh token with id %s expired", refresh.ID)
return nil, expiredErr
}
if s.refreshTokenPolicy.ExpiredBecauseUnused(refresh.LastUsed) {
s.logger.Errorf("refresh token with id %s expired due to inactivity", refresh.ID)
return nil, expiredErr
}
return &refresh, nil
}
func (s *Server) getRefreshScopes(r *http.Request, refresh *storage.RefreshToken) ([]string, *refreshError) {
// Per the OAuth2 spec, if the client has omitted the scopes, default to the original
// authorized scopes.
//
// https://tools.ietf.org/html/rfc6749#section-6
scope := r.PostFormValue("scope")
if scope == "" {
return refresh.Scopes, nil
}
requestedScopes := strings.Fields(scope)
var unauthorizedScopes []string
// Per the OAuth2 spec, if the client has omitted the scopes, default to the original
// authorized scopes.
//
// https://tools.ietf.org/html/rfc6749#section-6
for _, requestScope := range requestedScopes {
if !contains(refresh.Scopes, requestScope) {
unauthorizedScopes = append(unauthorizedScopes, requestScope)
}
}
if len(unauthorizedScopes) > 0 {
desc := fmt.Sprintf("Requested scopes contain unauthorized scope(s): %q.", unauthorizedScopes)
return nil, newBadRequestError(desc)
}
return requestedScopes, nil
}
func (s *Server) refreshWithConnector(ctx context.Context, token *internal.RefreshToken, refresh *storage.RefreshToken, scopes []string) (connector.Identity, *refreshError) {
var connectorData []byte
session, err := s.storage.GetOfflineSessions(refresh.Claims.UserID, refresh.ConnectorID)
switch {
case err != nil:
if err != storage.ErrNotFound {
s.logger.Errorf("failed to get offline session: %v", err)
return connector.Identity{}, newInternalServerError()
}
case len(refresh.ConnectorData) > 0:
// Use the old connector data if it exists, should be deleted once used
connectorData = refresh.ConnectorData
default:
connectorData = session.ConnectorData
}
conn, err := s.getConnector(refresh.ConnectorID)
if err != nil {
s.logger.Errorf("connector with ID %q not found: %v", refresh.ConnectorID, err)
return connector.Identity{}, newInternalServerError()
}
ident := connector.Identity{
UserID: refresh.Claims.UserID,
Username: refresh.Claims.Username,
PreferredUsername: refresh.Claims.PreferredUsername,
Email: refresh.Claims.Email,
EmailVerified: refresh.Claims.EmailVerified,
Groups: refresh.Claims.Groups,
ConnectorData: connectorData,
}
// user's token was previously updated by a connector and is allowed to reuse
// it is excessive to refresh identity in upstream
if s.refreshTokenPolicy.AllowedToReuse(refresh.LastUsed) && token.Token == refresh.ObsoleteToken {
return ident, nil
}
// Can the connector refresh the identity? If so, attempt to refresh the data
// in the connector.
//
// TODO(ericchiang): We may want a strict mode where connectors that don't implement
// this interface can't perform refreshing.
if refreshConn, ok := conn.Connector.(connector.RefreshConnector); ok {
newIdent, err := refreshConn.Refresh(ctx, parseScopes(scopes), ident)
if err != nil {
s.logger.Errorf("failed to refresh identity: %v", err)
return connector.Identity{}, newInternalServerError()
}
ident = newIdent
}
return ident, nil
}
// updateOfflineSession updates offline session in the storage
func (s *Server) updateOfflineSession(refresh *storage.RefreshToken, ident connector.Identity, lastUsed time.Time) *refreshError {
offlineSessionUpdater := func(old storage.OfflineSessions) (storage.OfflineSessions, error) {
if old.Refresh[refresh.ClientID].ID != refresh.ID {
return old, errors.New("refresh token invalid")
}
old.Refresh[refresh.ClientID].LastUsed = lastUsed
old.ConnectorData = ident.ConnectorData
return old, nil
}
// Update LastUsed time stamp in refresh token reference object
// in offline session for the user.
err := s.storage.UpdateOfflineSessions(refresh.Claims.UserID, refresh.ConnectorID, offlineSessionUpdater)
if err != nil {
s.logger.Errorf("failed to update offline session: %v", err)
return newInternalServerError()
}
return nil
}
// updateRefreshToken updates refresh token and offline session in the storage
func (s *Server) updateRefreshToken(token *internal.RefreshToken, refresh *storage.RefreshToken, ident connector.Identity) (*internal.RefreshToken, *refreshError) {
newToken := token
if s.refreshTokenPolicy.RotationEnabled() {
newToken = &internal.RefreshToken{
RefreshId: refresh.ID,
Token: storage.NewID(),
}
}
lastUsed := s.now()
refreshTokenUpdater := func(old storage.RefreshToken) (storage.RefreshToken, error) {
if s.refreshTokenPolicy.RotationEnabled() {
if old.Token != token.Token {
if s.refreshTokenPolicy.AllowedToReuse(old.LastUsed) && old.ObsoleteToken == token.Token {
newToken.Token = old.Token
// Do not update last used time for offline session if token is allowed to be reused
lastUsed = old.LastUsed
return old, nil
}
return old, errors.New("refresh token claimed twice")
}
old.ObsoleteToken = old.Token
}
old.Token = newToken.Token
// Update the claims of the refresh token.
//
// UserID intentionally ignored for now.
old.Claims.Username = ident.Username
old.Claims.PreferredUsername = ident.PreferredUsername
old.Claims.Email = ident.Email
old.Claims.EmailVerified = ident.EmailVerified
old.Claims.Groups = ident.Groups
old.LastUsed = lastUsed
// ConnectorData has been moved to OfflineSession
old.ConnectorData = []byte{}
return old, nil
}
// Update refresh token in the storage.
err := s.storage.UpdateRefreshToken(refresh.ID, refreshTokenUpdater)
if err != nil {
s.logger.Errorf("failed to update refresh token: %v", err)
return nil, newInternalServerError()
}
rerr := s.updateOfflineSession(refresh, ident, lastUsed)
if rerr != nil {
return nil, rerr
}
return newToken, nil
}
// handleRefreshToken handles a refresh token request https://tools.ietf.org/html/rfc6749#section-6
// this method is the entrypoint for refresh tokens handling
func (s *Server) handleRefreshToken(w http.ResponseWriter, r *http.Request, client storage.Client) {
token, rerr := s.extractRefreshTokenFromRequest(r)
if rerr != nil {
s.refreshTokenErrHelper(w, rerr)
return
}
refresh, rerr := s.getRefreshTokenFromStorage(client.ID, token)
if rerr != nil {
s.refreshTokenErrHelper(w, rerr)
return
}
scopes, rerr := s.getRefreshScopes(r, refresh)
if rerr != nil {
s.refreshTokenErrHelper(w, rerr)
return
}
ident, rerr := s.refreshWithConnector(r.Context(), token, refresh, scopes)
if rerr != nil {
s.refreshTokenErrHelper(w, rerr)
return
}
claims := storage.Claims{
UserID: ident.UserID,
Username: ident.Username,
PreferredUsername: ident.PreferredUsername,
Email: ident.Email,
EmailVerified: ident.EmailVerified,
Groups: ident.Groups,
}
accessToken, err := s.newAccessToken(client.ID, claims, scopes, refresh.Nonce, refresh.ConnectorID)
if err != nil {
s.logger.Errorf("failed to create new access token: %v", err)
s.refreshTokenErrHelper(w, newInternalServerError())
return
}
idToken, expiry, err := s.newIDToken(client.ID, claims, scopes, refresh.Nonce, accessToken, "", refresh.ConnectorID)
if err != nil {
s.logger.Errorf("failed to create ID token: %v", err)
s.refreshTokenErrHelper(w, newInternalServerError())
return
}
newToken, rerr := s.updateRefreshToken(token, refresh, ident)
if rerr != nil {
s.refreshTokenErrHelper(w, rerr)
return
}
rawNewToken, err := internal.Marshal(newToken)
if err != nil {
s.logger.Errorf("failed to marshal refresh token: %v", err)
s.refreshTokenErrHelper(w, newInternalServerError())
return
}
resp := s.toAccessTokenResponse(idToken, accessToken, rawNewToken, expiry)
s.writeAccessToken(w, resp)
}