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flow_refresh.go
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flow_refresh.go
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// Copyright © 2024 Ory Corp
// SPDX-License-Identifier: Apache-2.0
package oauth2
import (
"context"
"fmt"
"strings"
"time"
"github.com/ory/x/errorsx"
"github.com/pkg/errors"
"github.com/ory/fosite"
"github.com/ory/fosite/storage"
)
var _ fosite.TokenEndpointHandler = (*RefreshTokenGrantHandler)(nil)
type RefreshTokenGrantHandler struct {
AccessTokenStrategy AccessTokenStrategy
RefreshTokenStrategy RefreshTokenStrategy
TokenRevocationStorage TokenRevocationStorage
Config interface {
fosite.AccessTokenLifespanProvider
fosite.RefreshTokenLifespanProvider
fosite.ScopeStrategyProvider
fosite.AudienceStrategyProvider
fosite.RefreshTokenScopesProvider
}
}
// HandleTokenEndpointRequest implements https://tools.ietf.org/html/rfc6749#section-6
func (c *RefreshTokenGrantHandler) HandleTokenEndpointRequest(ctx context.Context, request fosite.AccessRequester) error {
if !c.CanHandleTokenEndpointRequest(ctx, request) {
return errorsx.WithStack(fosite.ErrUnknownRequest)
}
if !request.GetClient().GetGrantTypes().Has("refresh_token") {
return errorsx.WithStack(fosite.ErrUnauthorizedClient.WithHint("The OAuth 2.0 Client is not allowed to use authorization grant 'refresh_token'."))
}
refresh := request.GetRequestForm().Get("refresh_token")
signature := c.RefreshTokenStrategy.RefreshTokenSignature(ctx, refresh)
originalRequest, err := c.TokenRevocationStorage.GetRefreshTokenSession(ctx, signature, request.GetSession())
if errors.Is(err, fosite.ErrInactiveToken) {
// Detected refresh token reuse
if rErr := c.handleRefreshTokenReuse(ctx, signature, originalRequest); rErr != nil {
return errorsx.WithStack(rErr)
}
return errorsx.WithStack(fosite.ErrInactiveToken.WithWrap(err).WithDebug(err.Error()))
} else if errors.Is(err, fosite.ErrNotFound) {
return errorsx.WithStack(fosite.ErrInvalidGrant.WithWrap(err).WithDebugf("The refresh token has not been found: %s", err.Error()))
} else if err != nil {
return errorsx.WithStack(fosite.ErrServerError.WithWrap(err).WithDebug(err.Error()))
} else if err := c.RefreshTokenStrategy.ValidateRefreshToken(ctx, originalRequest, refresh); err != nil {
// The authorization server MUST ... validate the refresh token.
// This needs to happen after store retrieval for the session to be hydrated properly
if errors.Is(err, fosite.ErrTokenExpired) {
return errorsx.WithStack(fosite.ErrInvalidGrant.WithWrap(err).WithDebug(err.Error()))
}
return errorsx.WithStack(fosite.ErrInvalidRequest.WithWrap(err).WithDebug(err.Error()))
}
if !(len(c.Config.GetRefreshTokenScopes(ctx)) == 0 || originalRequest.GetGrantedScopes().HasOneOf(c.Config.GetRefreshTokenScopes(ctx)...)) {
scopeNames := strings.Join(c.Config.GetRefreshTokenScopes(ctx), " or ")
hint := fmt.Sprintf("The OAuth 2.0 Client was not granted scope %s and may thus not perform the 'refresh_token' authorization grant.", scopeNames)
return errorsx.WithStack(fosite.ErrScopeNotGranted.WithHint(hint))
}
// The authorization server MUST ... and ensure that the refresh token was issued to the authenticated client
if originalRequest.GetClient().GetID() != request.GetClient().GetID() {
return errorsx.WithStack(fosite.ErrInvalidGrant.WithHint("The OAuth 2.0 Client ID from this request does not match the ID during the initial token issuance."))
}
request.SetID(originalRequest.GetID())
request.SetSession(originalRequest.GetSession().Clone())
request.SetRequestedScopes(originalRequest.GetRequestedScopes())
request.SetRequestedAudience(originalRequest.GetRequestedAudience())
for _, scope := range originalRequest.GetGrantedScopes() {
if !c.Config.GetScopeStrategy(ctx)(request.GetClient().GetScopes(), scope) {
return errorsx.WithStack(fosite.ErrInvalidScope.WithHintf("The OAuth 2.0 Client is not allowed to request scope '%s'.", scope))
}
request.GrantScope(scope)
}
if err := c.Config.GetAudienceStrategy(ctx)(request.GetClient().GetAudience(), originalRequest.GetGrantedAudience()); err != nil {
return err
}
for _, audience := range originalRequest.GetGrantedAudience() {
request.GrantAudience(audience)
}
atLifespan := fosite.GetEffectiveLifespan(request.GetClient(), fosite.GrantTypeRefreshToken, fosite.AccessToken, c.Config.GetAccessTokenLifespan(ctx))
request.GetSession().SetExpiresAt(fosite.AccessToken, time.Now().UTC().Add(atLifespan).Round(time.Second))
rtLifespan := fosite.GetEffectiveLifespan(request.GetClient(), fosite.GrantTypeRefreshToken, fosite.RefreshToken, c.Config.GetRefreshTokenLifespan(ctx))
if rtLifespan > -1 {
request.GetSession().SetExpiresAt(fosite.RefreshToken, time.Now().UTC().Add(rtLifespan).Round(time.Second))
}
return nil
}
// PopulateTokenEndpointResponse implements https://tools.ietf.org/html/rfc6749#section-6
func (c *RefreshTokenGrantHandler) PopulateTokenEndpointResponse(ctx context.Context, requester fosite.AccessRequester, responder fosite.AccessResponder) (err error) {
if !c.CanHandleTokenEndpointRequest(ctx, requester) {
return errorsx.WithStack(fosite.ErrUnknownRequest)
}
accessToken, accessSignature, err := c.AccessTokenStrategy.GenerateAccessToken(ctx, requester)
if err != nil {
return errorsx.WithStack(fosite.ErrServerError.WithWrap(err).WithDebug(err.Error()))
}
refreshToken, refreshSignature, err := c.RefreshTokenStrategy.GenerateRefreshToken(ctx, requester)
if err != nil {
return errorsx.WithStack(fosite.ErrServerError.WithWrap(err).WithDebug(err.Error()))
}
signature := c.RefreshTokenStrategy.RefreshTokenSignature(ctx, requester.GetRequestForm().Get("refresh_token"))
ctx, err = storage.MaybeBeginTx(ctx, c.TokenRevocationStorage)
if err != nil {
return errorsx.WithStack(fosite.ErrServerError.WithWrap(err).WithDebug(err.Error()))
}
defer func() {
err = c.handleRefreshTokenEndpointStorageError(ctx, err)
}()
ts, err := c.TokenRevocationStorage.GetRefreshTokenSession(ctx, signature, nil)
if err != nil {
return err
} else if err := c.TokenRevocationStorage.RevokeAccessToken(ctx, ts.GetID()); err != nil {
return err
}
if err := c.TokenRevocationStorage.RevokeRefreshTokenMaybeGracePeriod(ctx, ts.GetID(), signature); err != nil {
return err
}
storeReq := requester.Sanitize([]string{})
storeReq.SetID(ts.GetID())
if err = c.TokenRevocationStorage.CreateAccessTokenSession(ctx, accessSignature, storeReq); err != nil {
return err
}
if err = c.TokenRevocationStorage.CreateRefreshTokenSession(ctx, refreshSignature, storeReq); err != nil {
return err
}
responder.SetAccessToken(accessToken)
responder.SetTokenType("bearer")
atLifespan := fosite.GetEffectiveLifespan(requester.GetClient(), fosite.GrantTypeRefreshToken, fosite.AccessToken, c.Config.GetAccessTokenLifespan(ctx))
responder.SetExpiresIn(getExpiresIn(requester, fosite.AccessToken, atLifespan, time.Now().UTC()))
responder.SetScopes(requester.GetGrantedScopes())
responder.SetExtra("refresh_token", refreshToken)
if err = storage.MaybeCommitTx(ctx, c.TokenRevocationStorage); err != nil {
return err
}
return nil
}
// Reference: https://tools.ietf.org/html/rfc6819#section-5.2.2.3
//
// The basic idea is to change the refresh token
// value with every refresh request in order to detect attempts to
// obtain access tokens using old refresh tokens. Since the
// authorization server cannot determine whether the attacker or the
// legitimate client is trying to access, in case of such an access
// attempt the valid refresh token and the access authorization
// associated with it are both revoked.
func (c *RefreshTokenGrantHandler) handleRefreshTokenReuse(ctx context.Context, signature string, req fosite.Requester) (err error) {
ctx, err = storage.MaybeBeginTx(ctx, c.TokenRevocationStorage)
if err != nil {
return errorsx.WithStack(fosite.ErrServerError.WithWrap(err).WithDebug(err.Error()))
}
defer func() {
err = c.handleRefreshTokenEndpointStorageError(ctx, err)
}()
if err = c.TokenRevocationStorage.DeleteRefreshTokenSession(ctx, signature); err != nil {
return err
} else if err = c.TokenRevocationStorage.RevokeRefreshToken(
ctx, req.GetID(),
); err != nil && !errors.Is(err, fosite.ErrNotFound) {
return err
} else if err = c.TokenRevocationStorage.RevokeAccessToken(
ctx, req.GetID(),
); err != nil && !errors.Is(err, fosite.ErrNotFound) {
return err
}
if err = storage.MaybeCommitTx(ctx, c.TokenRevocationStorage); err != nil {
return err
}
return nil
}
func (c *RefreshTokenGrantHandler) handleRefreshTokenEndpointStorageError(ctx context.Context, storageErr error) (err error) {
if storageErr == nil {
return nil
}
defer func() {
if rollBackTxnErr := storage.MaybeRollbackTx(ctx, c.TokenRevocationStorage); rollBackTxnErr != nil {
err = errorsx.WithStack(fosite.ErrServerError.WithWrap(err).WithDebugf("error: %s; rollback error: %s", err, rollBackTxnErr))
}
}()
if errors.Is(storageErr, fosite.ErrSerializationFailure) {
return errorsx.WithStack(fosite.ErrInvalidRequest.
WithDebugf(storageErr.Error()).
WithHint("Failed to refresh token because of multiple concurrent requests using the same token which is not allowed."))
}
if errors.Is(storageErr, fosite.ErrNotFound) || errors.Is(storageErr, fosite.ErrInactiveToken) {
return errorsx.WithStack(fosite.ErrInvalidRequest.
WithDebugf(storageErr.Error()).
WithHint("Failed to refresh token because of multiple concurrent requests using the same token which is not allowed."))
}
return errorsx.WithStack(fosite.ErrServerError.WithWrap(storageErr).WithDebug(storageErr.Error()))
}
func (c *RefreshTokenGrantHandler) CanSkipClientAuth(ctx context.Context, requester fosite.AccessRequester) bool {
return false
}
func (c *RefreshTokenGrantHandler) CanHandleTokenEndpointRequest(ctx context.Context, requester fosite.AccessRequester) bool {
// grant_type REQUIRED.
// Value MUST be set to "refresh_token".
return requester.GetGrantTypes().ExactOne("refresh_token")
}