Vatrozid stoji između sustava i mreže,, te određuje kojim resursima vašeg računala udaljeni korisnici mogu pristupiti. Pravilno podešen vatrozid može uvelike povećato sigurnost vašeg sustava.
Odaberite pogodnu razinu sigurnosti za vaš sustav.
Bez vatrozida ? Bez vatrozida omogućuje potpuni pristup vašem sustavu i ne obavlja nikakve sigurnosne provjere. Sigurnosne provjere znače onemogućavanje pristupa određenimservisima. Ovo treba biti odabrano ako radite na mreži čijim računalimabezuvjetno vjerujete (Internet nije takva mreža), ili ako naknadno namjeravatepodesiti vatrozid.
Omogući vatrozid ? Ako odaberete Omogućivatrozid, veze koje niste izričito naveli neće biti prihvaćane od stranevašeg sustava. Uobičajeno, dozvoljene su samo veze koje su odgovor na vanjske upite, poput DNS odgovora ili DHCP zahtijeva.Ako je potreban pristup servisima koji se pokreću na ovom računalu, možeteodabrati koje servise ćete propustiti kroz vatrozid.
Ako namjeravate spajati vaš sustav na Internet, ali nemate namjeru pokretati poslužitelj,ovo je najsigurniji izbor.
Sljedeće, odaberite kojim servisima, ako postoje, želite omogućiti prolaz kroz vatrozid.
Omogućavanje ovih postavki omogućava određenim servisima prolaz kroz vatrozid.Uzmite u obzir da ovi servisi možda i nisu instalirani nasustavu. Omogućite sve postavke koje vam mogu zatrebati.
Remote Login (SSH) — Secure Shell (SSH) is a suite of tools for logging in to and executing commands on a remote machine. If you plan to use SSH tools to access your machine through a firewall, enable this option. You need to have the openssh-server package installed in order to access your machine remotely, using SSH tools.
Web Server (HTTP, HTTPS) — The HTTP and HTTPS protocols are used by Apache (and by other Web servers) to serve webpages. If you plan on making your Web server publicly available, enable this option. This option is not required for viewing pages locally or for developing webpages. You must install the httpd package if you want to serve webpages.
File Transfer (FTP) — The FTP protocol is used to transfer files between machines on a network. If you plan on making your FTP server publicly available, enable this option. You must install the vsftpd package in order to publicly serve files.
Mail Server (SMTP) — If you want to allow incoming mail delivery through your firewall, so that remote hosts can connect directly to your machine to deliver mail, enable this option. You do not need to enable this if you collect your mail from your Internet Service Provider's server using POP3 or IMAP, or if you use a tool such as fetchmail. Note that an improperly configured SMTP server can allow remote machines to use your server to send spam.
Additionally, you can now setup SELinux (Security Enhanced Linux) during your installation.
The SELinux implementation in Enterprise Linux is designed to improve the security of various server daemons while minimizing the impact on the day-to-day operations of your system.
Three states are available for you to choose from during the installation process:
Disable — Select Disable if you do not want SELinux security controls enabled on this system. The Disabled setting turns enforcing off and does not set up the machine for the use of a security policy.
Warn — Select Warn to be notified of any denials. The Warn state assigns labels to data and programs, and logs them, but does not enforce any policies. The Warn state is a good starting place for users who eventually want a fully active SELinux policy, but who first want to see what effects the policy would have on their general system operation. Note that users selecting the Warn state may notice some false positive and negative notifications.
Active — Select Active if you want SELinux to act in a fully active state. The Active state enforces all policies, such as denying access to unauthorized users for certain files and programs, for additional system protection. Choose this state only if you are sure that your system can still properly function with SELinux fully enabled.