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... Implementing a Firewall with Ipchains and IptablesUsing and Obtaining AutomatedFirewall Scripts and Graphical Firewall UtilitiesSeveral attempts have been made to automate the process of creating a ... owndynamic database. If this database senses a number of ports that havebeen scanned in a row, the ﬁrewall can take action. Some actions theﬁrewall can take may include automatic ﬁrewall reconﬁguration ... Firestarter1 38 _linux_ 09 6/20/01 9:49 AM Page 494Implementing a Firewall with Ipchains and Iptables • Chapter 9 487 already set, whereas the other actually sets the values .To create a rule thatmatches a...

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... to Open Source Security ™1 YEAR UPGRADEBUYER PROTECTION PLAN Linux: A Guide to Open Source Security The Only Way to Stop a Hacker Is to Think Like OneJames StangerPatrick T. Lane1 38 _linux_ FM ... Service (ToS) in a Linux Router 484 Setting ToS Values in Ipchains and Iptables 486 Using and Obtaining Automated Firewall Scriptsand Graphical Firewall Utilities 488 Understand Essential Linux ... type of attack is a snifﬁng attack. A snifﬁng attack is a type of man-in-the-middle attack, where a host that resides inthe middle of a connection is able to obtain and then manipulate data.You...

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... supplied a username andpassword. If a user attempts to run the command via sudo and that user is not inthe sudoers ﬁle, an e-mail is automatically sent to the administrator, indicatingthat an unauthorized ... ﬁlenames are now represented as variables.These variables are set automatically at runtime.■Undo feature Administrators can undo settings through variousmethods that are listed at the end ... this optimizationadds a layer of security to the process.■Add Authorized Use banners These banners automatically appearwhenever anyone logs on to the system.Authorized Use banners arehelpful...

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... Snort’s analysisfeature is able to read the contents of the captured packets and theninform you about any attacks waged against your network.; Snort is able to automatically detect attacks based ... directories, and databases.; An IDS can act as a supplement to a ﬁrewall, because it can help youmonitor trafﬁc on the internal network. Sometimes it may be useful to place an IDS application ... keep appearing in reports unless you update your database.Database update mode allows you to update the database so that it nowww.syngress.com1 38 _linux_ 04 6/20/01 9: 38 AM Page 255274 Chapter...

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... RedHat Package Manager (RPM) packages are already installed (you may need to update them later in this section). To check if an RPM is installed, enter rpm -qa | grep rpm_name .To install an RPM, ... time and trouble by acquiringFreeS/WAN through one of these alternate sources.Some available script sets are designed to allow you to manage ﬁrewallsthat also serve as FreeS/WAN IPSec gateways.You ... commands.Table 8. 6Common IPSec CommandsCommand Descriptionipsec auto up Requests Pluto to establish a connection (tunnel) using data stored in its internal database.ipsec auto down Requests Pluto...

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... rules database One of the common moves by a hacker is to alter the rules database in subtle ways that make it easier for thehacker to gain access to the network. Check your rules and comparethem ... fwlogsummary.small.cgi Script1 38 _linux_ 11 6/20/01 9:52 AM Page 585 588 Chapter 11 • Maintaining FirewallsYou will see that this particular HTML page is similar to the results of theFwlogsummary.small.cgi ... problems, because it will require you to ensure that this daemon is not sub-ject to bugs that can cause a security problem. Any daemon, such as Cron, thatacts automatically can cause problems...

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... packets.This way, a ﬁre-wall will not be able to capture and log the packets as easily.■-S Address Allows you to specify the originating address of the scan.Originally meant to allow Nmap to work ... adns (www.gnu.org/software/adns), gnome, and libpcap (libpcap is on the accompanying CD). All butadns are installed by default in Red Hat 7.0 systems, and all of the RPMpackages are available ... zombiewww.syngress.com1 38 _linux_ 03 6/20/01 9:35 AM Page 124152 Chapter 3 • System Scanning and Probing■The ability to add an entire IP network or DNS domain to the map,and then have Cheops automatically add...

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... creates its database, it is said to enter databaseinitialization mode.5. You can then set Tripwire to rescan these ﬁles and compare their signa-tures to the signatures stored in the database.This ... generally extends your logging capability by placing additional information into a log ﬁle or into a database. Alerting An IDS often has the ability to send alert messages to the network administrator ... the database on a different device than the hard drive is a good idea.The ﬁrst thing a reasonably talented hacker will do afterobtaining root is ﬁnd and erase the database. In the past, many...

hack proofing linux a Guide to Open Source Security phần 6 pptx

... and /var/kerberos/krb5kdc/kdc.acl ﬁles to reﬂect your Kerberosrealm and DNS domain names.You must then add an administrative user, as wellas additional principals, to the database.Using kadmin.localBecause ... a Kerberos administrator uses the kadmin pro-gram to add a principal to the database. Note that the ticket does not actuallycontain the password. It is only signed by a password, which creates ... their packet snifﬁng on one server orclient interface, or try to hack into a server that contains the sensitiveinformation they seek. For example, they may attempt to hack into a bank’s database...

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... that allApplication layer data is encrypted. No passwords, usernames, or usable datawww.syngress.comChapter 7 Continued1 38 _linux_ AppB 6/20/01 9:55 AM Page 624 Hack Prooﬁng Linux Fast Track ... database. Determine if any unauthorized changes have beenmade to your database. Use the diff command to compare the two ﬁles to see if any changes have occurred.You may also use md5 to generate ... encrypted, many tools exist that help hackers wage a snifﬁng attack to capture encrypted information.; After the packets containing the encrypted passwords are captured, hackersuse cracking applications...

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