database web application cms

now i'm going to build a web application works over intranet for a government company. the company do so many paper works for the civilians, so they need to develop a web application helps them in this issue. so my question is, if there any CMS or kind of that, that help me to make the application development more easy, The tool must ensure : 1- users management. 2- clients management. 3- data security. 4- building some costume web pages.