Download Linux Administrators Security Guide by Seifried K. PDF

By Seifried K.

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Sample text

Netstat Output netstat tells us pretty much anything network related that you can imagine, however it is especially good at listing active connections and sockets. Using netstat we can find which ports on which interfaces are active. The following output is from a typical server using netstat –an. 0:* State ESTABLISHED LISTEN LISTEN LISTEN LISTEN LISTEN LISTEN LISTEN LISTEN LISTEN LISTEN LISTEN LISTEN Numeric output is in my opinion easier to read, once you memorize /etc/services anyways. * means someone is actively talking to it), and the port state.

But what does this actually mean? Take a 'normal' program, say login, when a user connects to a tty (via modem or telnet) a getty program answers the call (as it were) and usually starts up the 'login' program, login then requests a username, followed by a password, which it checks against the /etc/passwd file. So what happens if you have a spiffy new digital card authentication system? Well you have to recompile login (and any other apps that will use it) so they support the new system. As you can imagine this is quite laborious and prone to errors.

Authentication, verification, encryption and so on. Spoofing packets, intercepting packets, reading data payloads, and so is remarkably easy in today's Internet. The most common attacks are denial of service attacks since they are the easiest to execute and the hardest to defeat, followed by packet sniffing, port scanning, and other related activities. Hostnames don't always point at the right IP addresses and IP addresses don't always reverse lookup to the right hostname. Do not use hostname based authentication if possible, as DNS cache poisoning is relatively easy, relying on IP addresses for authentication reduces the problem to one of spoofing, but is also inherently flawed.

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