Administrator's Guide - Kerio Software Archive

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Chapter 8 Firewall and Intrusion Prevention System 8.1 Network intrusion prevention system (IPS) Kerio Control integrates Snort, an intrusion detection and prevention system (IDS/IPS) protecting the firewall and the local network from known network intrusions. In Kerio Control, the system name is simplified for Intrusion Prevention (the name includes meaning of both functions — no prevention measures can be taken without detection). What the intrusion prevention system is for and how it works Network intrusion is undesirable network traffic impacting on functionality or security of the victim-host. Its purpose is mostly to get illegitimate access or/and to exploit fragile data. A typical attribute of such intrusions is their apparent legitimacy and it is difficult to uncover such traffic and filter it simply out by traffic rules. Let us use DoS intrusion (Denial of Service) as an example. In this type of intrusion, too many connections are established on a port to use up the system resources of the server application so that no other users can connect there. However, the firewall considers this act only as an access to an allowed port. Therefore, sophisticated analysis of network traffic is needed here to detect network intrusions. Network intrusion detection systems use databases of known intrusions (this is similar to antivirus programs using databases of known viruses). Thanks to regular update of the database, new intrusion types are also recognized. In the current version of Kerio Control, the intrusion prevention system works on all network interfaces included in the Internet interfaces group (see chapter 5). This implies that it detects and blocks network intrusions coming from the Internet, not from hosts in local networks or VPN clients (these hosts are considered as trusted). For correct functionality of the intrusion prevention system, use of NAT is required (for details on NAT, see chapter 7.3). It can therefore be used for all typical configurations where Kerio Control is used for protection of local network. If Kerio Control is implemented as so called neutral router (without IP address translation), the intrusion prevention system will not work correctly. Intrusion detection is performed before application of traffic rules (see chapter 7) which avoids intervention of traffic rules with the detection process. 112
8.1 Network intrusion prevention system (IPS) Intrusion prevention configuration in Kerio Control The intrusion prevention system can be configured under Configuration → Traffic Policy → Intrusion Prevention. Figure 8.1 Intrusion prevention configuration in Kerio Control Detection of known intrusion types Kerio Control distinguishes three levels of intrusion severity: • High severity, • Medium severity, • Low severity. For each severity level, one of the following actions can be set: • Log and drop — information about the detected intrusion will be recorded in the Security log (see chapter 22.11) and the particular network traffic will be blocked. 113
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Kerio Control Administrator’s Gui
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Contents 1 Quick Checklist . . . .
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13 HTTP and FTP filtering . . . . .
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26 Technical support . . . . . . .
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8. Enable the intrusion prevention
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2.2 Conflicting software Warning: S
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2.3 System requirements met). 2.3 S
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2.4 Installation - Windows • TCP/
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2.4 Installation - Windows Warning:
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2.5 Initial configuration wizard (W
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2.6 Upgrade and Uninstallation - Wi
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2.7 Installation - Software Applian
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2.7 Installation - Software Applian
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2.10 Kerio Control Engine Monitor (
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2.11 The firewall’s console (Soft
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3.1 Kerio Control Administration we
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3.2 Administration Console - the ma
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3.3 Administration Console - view p
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Chapter 4 License and Registration
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4.3 License information User is def
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4.4 Registration of the product in
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4.6 Subscription / Update Expiratio
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Chapter 5 Network interfaces Kerio
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5.3 Viewing and editing interfaces
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5.3 Viewing and editing interfaces
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5.5 Advanced dial-up settings Figur
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5.6 Supportive scripts for link con
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Page 125 and 126: 9.1 DNS module of the firewall’s
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11.1 Firewall User Authentication a
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12.1 Web interface and certificate
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12.2 User authentication at the web
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Chapter 13 HTTP and FTP filtering K
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13.2 URL Rules Rules in this sectio
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13.2 URL Rules for example a rule a
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13.2 URL Rules • A page informing
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13.3 Content Rating System (Kerio W
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13.3 Content Rating System (Kerio W
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13.4 Web content filtering by word
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13.4 Web content filtering by word
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13.5 FTP Policy Weight Word weight
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13.5 FTP Policy Open the General ta
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13.5 FTP Policy Scan content for vi
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14.2 How to choose and setup antivi
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14.2 How to choose and setup antivi
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14.3 HTTP and FTP scanning Warning:
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14.3 HTTP and FTP scanning Use the
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14.4 Email scanning If only an aste
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14.4 Email scanning Figure 14.9 Set
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14.5 Scanning of files transferred
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15.2 Time Ranges Figure 15.2 IP gro
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15.3 Services Figure 15.4 Time rang
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15.3 Services Protocol The communic
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15.4 URL Groups Note: 1. Generally,
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15.4 URL Groups Examples:: • www.
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16.1 Viewing and definitions of use
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16.2 Local user accounts Accounts m
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16.2 Local user accounts Name Usern
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16.2 Local user accounts Step 3 —
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16.2 Local user accounts Figure 16.
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16.2 Local user accounts Within thi
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16.3 Local user database: external
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16.4 User accounts in Active Direct
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16.5 User groups Note: In case of u
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16.5 User groups Using the Add and
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Chapter 17 Administrative settings
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17.3 Update Checking Figure 17.2 Tr
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17.3 Update Checking Last update ch
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18.1 Routing table Route Types The
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18.2 Universal Plug-and-Play (UPnP)
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18.3 Relay SMTP server 18.3 Relay S
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Chapter 19 Status Information Kerio
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19.1 Active hosts and connected use
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19.2 Network connections overview
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19.2 Network connections overview F
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19.4 Alerts • Session duration.
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19.4 Alerts • Connection failover
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19.4 Alerts Click an event to view
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20.1 Volume of transferred data and
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20.2 Interface statistics Figure 20
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20.2 Interface statistics Figure 20
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21.1 Monitoring and storage of stat
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21.2 Settings for statistics and qu
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21.3 Connection to StaR and viewing
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21.3 Connection to StaR and viewing
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22.1 Log settings Figure 22.1 Log s
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22.1 Log settings Figure 22.3 Syslo
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22.2 Logs Context Menu • Target f
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22.3 Alert Log Figure 22.7 Highligh
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22.5 Connection Log A typical examp
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22.6 Debug Log The expression must
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22.7 Dial Log 3. Disconnection caus
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22.9 Filter Log • 8000-8099 — H
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22.10 Http log Packet log example:
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22.11 Security Log An example of Ht
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22.11 Security Log Example: [17/Jul
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22.13 Warning Log Events causing di
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Chapter 23 Kerio VPN Kerio Control
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23.1 VPN Server Configuration Figur
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23.1 VPN Server Configuration the V
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23.1 VPN Server Configuration Kerio
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23.3 Interconnection of two private
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23.4 Exchange of routing informatio
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23.5 Example of Kerio VPN configura
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23.6 Example of a more complex Keri
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24.1 Kerio Control SSL-VPN configur
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Chapter 25 Specific settings and tr
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25.3 Automatic user authentication
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25.3 Automatic user authentication
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25.4 FTP over Kerio Control proxy s
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25.5 Internet links dialed on deman
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The text file will be stored in the
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Appendix B Used open source items K
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Copyright © 2005 Harald Welte Dist
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Glossary of terms ActiveX This Micr
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Ident The Ident protocol is used fo
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Policy routing Advanced routing tec
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TCP Transmission Control Protocol i
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dial-up 64 dialing scripts 21, 58 h
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S service 89, 207 SIP 210 SSL-VPN 3
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