Set the NameID in the saml.Session

saml/saml.go

@@ -199,6 +199,7 @@ func (b *userFileBackend) GetSession(w http.ResponseWriter, r *http.Request, req
 		CreateTime:     saml.TimeNow(),
 		ExpireTime:     saml.TimeNow().Add(sessionMaxAge),
 		Index:          hex.EncodeToString(randomBytes(32)),
+		NameID:         user.Name,
 		UserName:       user.Name,
 		UserEmail:      user.Email,
 		UserCommonName: user.Name,