By Peter G(Peter G. Smith) Smith
Deal with. regrettably, in ultra-modern surroundings all networks are power hacker ambitions, from top-secret army examine networks to small domestic LANs. most present Linux documentation focuses extra on ease of use than safety, so Linux community safety makes a speciality of securing Linux in a networked setting, the place the safety of the complete community should be thought of, instead of simply remoted machines. this entire advisor presents a mixture of thought and functional suggestions to educate directors tips to set up and use safeguard purposes, in addition to how they paintings and why they're useful of their networks. beginning with the necessity for defense and knowing the matter, the e-book teaches directors approximately packet filtering (firewalling) with iptables, hardening companies reminiscent of Apache, BIND, Sendmail, FTP, and MySQL to avoid assaults, community research, encryption, neighborhood safety, DoS assaults, and rootkits. Auditing networks for capability vulnerabilities and growing safe passwords also are explored. this is often the only ebook that actually info find out how to safe a Linux community.
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Additional resources for Linux Network Security (Administrator's Advantage Series)
Sample text
This isn't generally a problem with UDP/ICMP flooding because the response isn't important; it does however present profound problems for TCP connections, and spoofing the source address in a TCP connection is the most profitable, with many services (such as the Berkley R* Suite) using host-based authentication. We mentioned the three-way handshake earlier in our discussion on SYN flooding, but left out some of the details. 17) of the three-way handshake. 17: Sequence number exchange during the three-way handshake.
Puta/. conf, and inetd is restarted—this is the attacker's means of reentry. nsys; killall -HUP inetd /bin/login is moved to /sbin/xlogin, and replaced with a trojaned version allowing any user to log in with the password stored (encrypted) in /etc/ttyhash. This rootkit is notable for two reasons: the netstat binary is broken, segfaulting when executed (due to an overflow in a strcpy, it would appear); and the ps binary is 31,336 bytes in size—one byte off of being 31,337 (cracker slang for the word "elite").
Not only does this allow snoopers to learn passwords and usernames, but it also allows them to view potentially sensitive data such as e-mail messages, and even to reconstitute files attached to e-mails or transmitted over FTP. Ethereal is a popular GUI-based packet sniffer for Linux, which provides an easy-to-read hierarchal view of captured traffic. 13 shows it in action, snooping in on an ftp session. 13: The Ethereal packet sniffer. 10 with MAC: 00:04:75:7D:56:1F on Iface: eth0 Loading plugins...