Basic Linux Desktop Security. Konrad Rosenbaum this presentation is protected by the GNU General Public License version 2 or any newer
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1 Basic Linux Desktop Security Konrad Rosenbaum this presentation is protected by the GNU General Public License version 2 or any newer
2 Think Security: 5Q 1)What is the problem? 2)What is the proposed solution? 3)What is the cost? 4)Is it effective? 5)What are the collateral damages? Worth it? (from: Schneier Beyond Fear )
3 Think Security: SPoF Never design a single point of failure! Design as layers of security. System
4 Think Security: Trust? Design a threat model: What are you concerned about? What components/people do you trust? How far do you trust them? With what do you trust them? Are you sure?
5 Distribution Chose a distribution that is designed for what you want to do....one you can trust. Find its security mail list. eg. Debian: debian-security-announce (AT) lists.debian.org Find out how things are done with it. Keep updating! (at least once/week)
6 Passwords Chose secure passwords: mix upper-/lower-case letters, special characters and digits don't use words from any dictionary make it long enough (about 8 characters) eg. use a sentence that you can remember, use the first letter of each word, replace some letters by digits Remember: Passwords are unsafe.
7 Get rid of Junk Shutdown/uninstall anything you don't need. Do you need CUPS? (printer?) Do you need Apache? (is this a webserver?) Do you really need FTP? Do you really need five different databases? Do you need GCC? (Are you a developer?)
8 Configure Securely Default config is often insecure. Don't allow open mail relay. Don't allow open web proxies. SSH: Don't open it to outside network if not necessary. Don't use password-authentication.
9 Restrict Users NEVER WORK AS ROOT!!! Don't give users rights they don't need. Don't give anyone your password. There is no excuse! No Admin will ever need it! Use different passwords on different systems. (Or groups of systems.)
10 Firewalls Every system has a right to its own firewall! Never connect an unprotected system to any network. Make the firewall as tight as possible. Opening up later is easier than cleaning up an incident. Whenever possible: block both directions. Don't forget IPv6!
11 Random Thoughts Alteration Detection: Tripwire Intrusion Detection: Snort Rootkit Scanner: Tiger etc.pp.
12 IP-Tables Tables: filter - the actual firewall part nat - network address translation filter chains INPUT, FORWARD, OUTPUT nat chains PREROUTING, POSTROUTING, OUTPUT
13 IP-Tables: filtering Use tools: iptables-save/-restore Policy: DROP/REJECT Divide Traffic per Interface. *filter :INPUT DROP :FORWARD DROP :OUTPUT DROP :netw :netout :rootout #Incoming Traffic #accept loopback: A INPUT i lo j ACCEPT #filter all others A INPUT j netw #paranoid droppings: A INPUT j DROP #This is not a router: A FORWARD j DROP #Outgoing Traffic #accept loopback A OUTPUT o lo j ACCEPT #filter all others A OUTPUT j netout #reject remainder A OUTPUT j REJECT
14 IP-Tables: INPUT Accept what you requested. Accept legitimate users. Reject everything else. #accept ICMP A netw p icmp j ACCEPT # accept DNS (see query_source in /etc/bin/named.conf) A netw p udp m udp sport 53 j ACCEPT A netw p tcp m tcp sport 53 j ACCEPT # XNTP A netw p udp m udp dport 123 j ACCEPT # accept SSH A netw p tcp m tcp dport 22 j ACCEPT # accept TCP when established from local ## filter SYN A netw p tcp m tcp syn j DROP ## accept TCP above 1024 (denies communication with priv. ports) A netw p tcp m tcp dport 1024: j ACCEPT
15 IP-Tables: OUTPUT Allow desired services. Allow some users. Reject everything else. #Allow ICMP A netout p icmp j ACCEPT #Allow DNS in both directions A netout p tcp m tcp dport 53 j ACCEPT A netout p udp m udp dport 53 j ACCEPT #Allow XNTP A netout p udp m udp sport 123 j ACCEPT ##Owner exceptions #root A netout p tcp m owner uid owner 0 j rootout ##Filter TCP SYN A netout p tcp m tcp syn j REJECT #allow remainder (established) of TCP A netout p tcp m tcp j ACCEPT ##Filter all UDP A netout p udp m udp j REJECT
16 IP-Tables: users Allow only needed services. Prevents broken systems from doing more harm. ### Root (apt get) #update.pureserver.info: A rootout p tcp m tcp d dport 80 j ACCEPT #security.debian.org A rootout p tcp m tcp d dport 80 j ACCEPT A rootout p tcp m tcp d dport 80 j ACCEPT A rootout p tcp m tcp d dport 80 j ACCEPT
17 IP-Tables: chain-design Policy: don't allow anything. Start at bottom: reject everything. Move upwards: allow wanted services make exceptions become more specific
18 Questions??
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