Forfatterarkiv: mike

Encrypt IMAP and POP with SSL

Udgivet den juli 10, 2004 af mike

Keep your email safe from prying eyes while also protecting your POP and IMAP passwords. Having your email available on an IMAP server is invaluable when you have to access your email from multiple locations. Unlike POP, IMAP stores all … Læs resten →

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Distribute your CA to clients

Udgivet den juli 10, 2004 af mike

Be sure all of your clients trust your new Certificate Authority. Once you have created a Certificate Authority (CA) [Hack #45], any certificates that are signed by your CA will be trusted by any program that trusts your CA. To … Læs resten →

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Create your own certificate authority

Udgivet den juli 10, 2004 af mike

Sign your own certificates to use in securing your network. SSL certificates are usually thought of as being used for secure communications over the HTTP protocol. However, they are also useful in providing both a means for authentication and a … Læs resten →

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Fool Remote operating system detection software on linux with iptables

Udgivet den juli 10, 2004 af mike

Evade remote OS detection attempts by disguising your TCP/IP stack. Another method to thwart operating system detection attempts is to modify the behavior of your system’s TCP/IP stack and make it emulate the behavior of another operating system. This may … Læs resten →

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MAC Filtering with iptables

Udgivet den juli 10, 2004 af mike

Keep unwanted machines off your network with MAC address whitelisting Media Access Control (MAC) address filtering is a well-known method for protecting wireless networks. This type of filtering works on the default deny principle: you specify the hosts that are … Læs resten →

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Authenticated Gateway with OpenBSD

Udgivet den juli 10, 2004 af mike

Use PF to keep unauthorized users off the network. Firewalling gateways have traditionally been used to block traffic from specific services or machines. Instead of watching IP addresses and port numbers, an authenticated gateway allows you to regulate traffic to … Læs resten →

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Simple firewall with openbsd

Udgivet den juli 9, 2004 af mike

Use OpenBSD’s firewalling features to protect your network. PacketFilter, commonly known as PF, is the firewalling system available in OpenBSD. While it is a relatively new addition to the operating system, it has already surpassed IPFilter, the system it has … Læs resten →

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Simple IPTABLE firewall

Udgivet den juli 9, 2004 af mike

Protect your network with Linux’s powerful firewalling features. Linux has long had the capability for filtering packets, and it has come a long way since the early days in terms of both power and flexibility. The first generation of packet-filtering … Læs resten →

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Statiske mac tabeller

Udgivet den juli 9, 2004 af mike

Use static ARP table entries to combat spoofing and other nefarious activities. As discussed in [Hack #31], a lot of bad things can happen if someone successfully poisons the ARP table of a machine on your network. The previous hack … Læs resten →

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Using ARPWATCH

Udgivet den juli 9, 2004 af mike

Find out if there’s a “man in the middle” impersonating your server. One of the biggest threats to a computer network is a rogue system pretending to be a trusted host. Once someone has successfully impersonated another host, they can … Læs resten →

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