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Internet Protocol Security, or IPSec, is a collection of protocols that provide Layer 3 security through authentication and encryption Generally speaking, all VPNs can be split up at a high level as either site to site or client to site VPNs It is important to realize that no matter what type of VPN is in use, all VPNs establish a private tunnel between two networks over a third, often less secure network Site to Site VPN With a site to site VPN, both endpoints are normally dedicated devices called VPN Gateways that are responsible for a number of different tasks such as tunnel establishment, encryption, and routing Systems wishing to communicate to a remote site are forwarded to these VPN gateways on their local network, which in turn seamlessly direct the traf c over the secure tunnel to the remote site with no client interaction Client to Site VPN Client to site or remote access VPNs allow a single remote user to access resources via a less secure network such as the Internet Client to site VPNs require the user to have a software-based VPN client on their system that handles session tasks such as tunnel establishment, encryption, and routing This client may be a thick client such as the Cisco VPN client, or it could be a web browser in the case of SSL VPNs Depending on the con guration, either all traf c from the client system will be forwarded over the VPN tunnel (split tunneling disabled) or only de ned traf c will be forwarded while all other traf c takes the client s default path (split tunneling enabled) One important note to make is that with split tunneling enabled and the VPN connected, the client s system effectively bridges the corporate internal network and the internet This is why it is crucial to keep split tunneling disabled at all times unless it is absolutely required.

The IP Security Protocol (IPSec) is a peer-reviewed proposed Internet standard that can authenticate and encrypt IP traffic Dozens of vendors offer IPSec-based products consult your favorite network supplier for their current offerings Linux users should consult the FreeSWAN project at http://wwwfreeswanorg/introhtml for a free open-source implementation of IPSec and IKE

IPSec employs the Internet Key Exchange (IKE) protocol for authentication as well as key and tunnel establishment IKE is split into two phases, each of which has its own distinct purpose IKE Phase 1 IKE Phase 1 s main purpose is to authenticate the two communicating parties with each other and then set up a secure channel for IKE Phase 2 This can be done in one of two ways: Main mode or Aggressive mode Main mode In three two-way handshakes (a total of 6 messages), Main mode authenticates both parties to each other This process rst establishes a secure channel in which authentication information is then exchanged securely between the two parties Aggressive mode In only three messages, Aggressive mode accomplishes the same overall goal of main mode but in a faster, notably less secure fashion Aggressive mode does not provide a secure channel to protect authentication information which ultimately exposes it to eavesdropping attacks IKE Phase 2 IKE Phase 2 s final aim is to establish the IPSec tunnel, which it does with the help of IKE Phase 1

Not usually wanting to provide you (and especially the authorities) with a record of their system access, attackers will often clean up the system logs effectively removing their trail of chaos A number of log cleaners are usually a part of any good rootkit Some of the more popular programs are zap, wzap, wted, and remove But a simple text editor like vi or emacs will suffice in many cases Of course, the first step in removing the record of their activity is to alter the login logs To discover the appropriate technique for this requires a peek into the /etc/syslogconf configuration file For example, in the syslogconf file shown next, we know that the majority of the system logins can be found in the /var/log/ directory:

6:

[quake]# cat /etc/syslogconf # Log all kernel messages to the console # Logging much else clutters up the screen #kern* /dev/console # Log anything (except mail) of level info or higher # Don't log private authentication messages! *info;mailnone;authprivnone /var/log/messages # The authpriv file has restricted access authpriv* /var/log/secure # Log all the mail messages in one place mail* /var/log/maillog # Everybody gets emergency messages, plus log them on another # machine *emerg * # Save mail and news errors of level err and higher in a # special file uucp,newscrit /var/log/spooler

Popularity: Simplicity: Impact: Risk Rating: 8 6 8 7