By Andrew Lockhart
Within the fast-moving global of desktops, issues are continuously altering. because the first version of this strong-selling booklet seemed years in the past, community safeguard ideas and instruments have developed speedily to satisfy new and extra subtle threats that pop up with alarming regularity. The 2d variation bargains either new and punctiliously up-to-date hacks for Linux, home windows, OpenBSD, and Mac OS X servers that not just permit readers to safe TCP/IP-based prone, yet is helping them enforce a great deal of shrewdpermanent host-based safety suggestions besides.
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Extra resources for Network Security Hacks: Tips & Tools for Protecting Your Privacy (2nd Edition)
You can specify multiple jails with the same IP address, as long as you’re not running services within them that listen on the same port. By now you’ve seen how powerful jails can be. Whether you want to create virtual servers that can function as entire FreeBSD systems within a jail or just to compartmentalize critical services, they can offer another layer of security in protecting your systems from intruders. H A C K #11 Use proftpd with a MySQL Authentication Source Hack #11 Make sure that your database system’s OS is running as efficiently as possible with these tweaks.
Choosing a random value for the canary ensures that the attacker cannot know what it is and thus cannot include it in the data used to “smash” the stack. When a program is distributed in source form, the program’s developer cannot enforce the use of ProPolice, because it’s a nonstandard extension to the GCC compiler (although ProPolice-like features have been added to GCC 4. x, that version of GCC isn’t in common use). Using ProPolice is the responsibility of the person compiling the program. ProPolice is available with some BSD and Linux distributions out of the box.
Info HACK Prevent Services from Binding to an Interface To get a list of listening ports and their owning processes with sockstat, run this command: # sockstat -4 -l USER COMMAND root sendmail root sendmail root sshd root inetd root inetd named named named named named named PID 1141 1141 1138 1133 1133 1127 1127 1127 FD 4 5 3 4 5 20 21 22 PROTO tcp4 tcp4 tcp4 tcp4 tcp4 tcp4 udp4 udp4 LOCAL ADDRESS *:25 *:587 *:22 *:143 *:993 *:53 *:53 *:1351 FOREIGN ADDRESS *:* *:* *:* *:* *:* *:* *:* *:* Once again, you can see that SSHD, SMTP, DNS, IMAP, and IMAP+SSL services are running, but now you have the process that owns the socket plus its PID.