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Fix: Multi-Cookie Session Authentication Failure #5348

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Fix: Multi-Cookie Session Authentication Failure #5348

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a03b7f7
Fix: Support multi-cookie sessions in OAuth authentication
gazzadownunder Dec 17, 2025
c885a38
Merge branch 'obot-platform:main' into main
gazzadownunder Dec 17, 2025
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10 changes: 8 additions & 2 deletions pkg/proxy/proxy.go
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Original file line number Diff line number Diff line change
Expand Up @@ -51,8 +51,14 @@ func NewProxyManager(dispatcher *dispatcher.Dispatcher, gptClient *gptscript.GPT
func (pm *Manager) AuthenticateRequest(req *http.Request) (*authenticator.Response, bool, error) {
// Check for the access token cookie.
// This authenticator requires the cookie in order to authenticate any users.
if _, err := req.Cookie(ObotAccessTokenCookie); errors.Is(err, http.ErrNoCookie) {
return nil, false, nil
// When sessions exceed 4KB, oauth2-proxy splits them into multiple cookies (_0, _1, _2, etc.)
// so we check for either the base cookie or the _0 cookie.
_, err := req.Cookie(ObotAccessTokenCookie)
if errors.Is(err, http.ErrNoCookie) {
// Try the _0 cookie for multi-cookie sessions
if _, err := req.Cookie(ObotAccessTokenCookieZero); errors.Is(err, http.ErrNoCookie) {
return nil, false, nil
}
}

configuredProvider, err := pm.dispatcher.GetConfiguredAuthProvider(req.Context())
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