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Linux Journal: Configuring and Using an FTP Proxy

Nov 15, 2002, 08:30 (0 Talkback[s])
(Other stories by Mick Bauer)

"Running a public FTP site securely can be difficult. Taking full advantage of the security features supported by your FTP server application of choice can be a chore, and even then there's a good chance that sooner or later vulnerabilities will come to light making all that work for naught. So what else can you do?

"One important technique is to run an FTP proxy on your firewall. Whereas the standard Netfilter code in the Linux kernel only inspects packets, an FTP proxy lets your firewall act as an intermediary in all FTP transactions. This increases your protection against buffer overflows and many other kinds of FTP attacks. It also allows you to restrict which FTP commands are executed by FTP clients.

"This month I explain how to run SuSE's free (and non-SuSE-Linux-specific) Proxy-Suite FTP proxy on your Linux firewall, adding transparent but strong protection to all your FTP transactions..."

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