Požarni zid bo stal med vašim računalnikom in omrežjem in bo določal, do katerih virov na vašem računalniku bodo oddaljeni uporabniki lahko dostopali. Pravilno nastavljen požarni zid lahko veliko pripomore k večji zunanji varnosti vašega sistema.
Izberite ustrezno raven zaščite za vaš sistem.
Brez požarnega zidu —Brez požarnega zidu omogoči prosti dostop do vašega računalnika in ne opravlja varnostnih preverjanj (preprečevanje oddaljenega dostopa do nekaterih storitev). To možnost izberite le, če je računalnik povezan v omrežje, ki mu zaupate (ne na Internet) ali načrtujete kasnejšo nastavitev požarnega zidu.
Omogoči požarni zid — Če izberete Omogoči požarni zid, vaš sistem ne bo sprejemal povezav (razen teh iz privzetih nastavitev), ki jih ne boste eksplicitno definirali. Privzeto so dovoljene le povezave, ki nastanejo kot odgovor na izhodne zahtevke, kot so odgovori DNS ali zahtevki DHCP. Če potrebujete dostop do storitev, ki tečejo v tem stroju, lahko izberete, da dovolite prepuščanje določenih storitev skozi požarni zid.
Če se v sistem povezujete prek interneta, vendar ne nameravate zaganjati strežnika, je ta možnost najbolj varna.
V nadaljevanju izberite, katerim storitvam, če sploh katerim, naj bo dovoljeno prehajati skozi požarni zid.
S temi izbirami omogočite oddaljeni dostop skozi požarni zid do določenih storitev. Te storitve ne smejo biti nameščene privzeto v računalnik. Prepričajte se, da ste omogočili vse potrebne izbire.
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 @RHL@ 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.