Após ler todas as informações dos capítulos anteriores você deve estar pensando "Eu tenho que fazer muitas coisas para ter meu sistema fortalecido, estas coisas não poderiam ser automatizadas?". A resposta é sim, mas tenha cuidado com ferramentas automatizadas. Algumas pessoas acreditam que uma ferramenta de fortalecimento não elimina a necessidade de uma boa administração. Assim não seja tolo em pensar que pode automatizar todo o processo e corrigir todos os problemas relacionados a ele. Segurança é um processo progressivo no qual o administrador deve estar participando e não somente ficar a espera deixando que as ferramentas façam todo o trabalho, já que nenhuma ferramenta poderia fazer: todas as implementações de políticas de segurança possíveis, cobrindo todos os ataques e todos os ambientes.
Since woody (Debian 3.0) there are two specific packages that are useful for security hardening. The harden package which takes an approach based on the package dependencies to quickly install valuable security packages and remove those with flaws, configuration of the packages must be done by the administrator. The bastille package that implements a given security policy on the local system based on previous configuration by the administrator (the building of the configuration can be a guided process done with simple yes/no questions).
The
harden package tries to make it more easy to install and administer hosts that need good security. This package should be used by people that want some quick help to enhance the security of the system. It automatically installs some tools that should enhance security in some way: intrusion detection tools, security analysis tools, etc. Harden installs the following
virtual packages (i.e. no contents, just dependencies or recommendations on others):
harden-tools: tools to enhance system security (integrity checkers, intrusion detection, kernel patches...)
harden-environment: helps configure a hardened environment (currently empty).
harden-servers: removes servers considered insecure for some reason.
harden-clients: removes clients considered insecure for some reason.
harden-remoteaudit: tools to remotely audit a system.
harden-nids: helps to install a network intrusion detection system.
harden-surveillance: helps to install tools for monitoring of networks and services.
Useful packages which are not a dependence:
Be careful because if you have software you need (and which you do not wish to uninstall for some reason) and it conflicts with some of the packages above you might not be able to fully use
harden. The harden packages do not (directly) do a thing. They do have, however, intentional package conflicts with known non-secure packages. This way, the Debian packaging system will not approve the installation of these packages. For example, when you try to install a telnet daemon with
harden-servers,
apt will say:
# apt-get install telnetd
The following packages will be REMOVED:
\tharden-servers
The following NEW packages will be installed:
telnetd
Do you want to continue (Y/n)
Isto deverá deixar o administrador mais tranqüilo, reconsiderando suas ações que serão tomadas.
