Administrator's Guide - Kerio Software Archive

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Firewall and Intrusion Prevention System • Log — detected intrusion will be only recorded in the Security log, • No action — the detected intrusion will be ignored. Default and recommended settings for individual intrusion severity levels: • High severity → Log and drop, • Medium severity → Log, • Low severity → No action (in case that there is a suspicion of too many false alarm cases, see also Advanced settings). Functionality of the intrusion prevention system can be tested by clicking on the link on a special web page on one of the Kerio Technologies servers. Upon startup of the test, three fake harmless intrusions of high, middle and low severity will be sent to the client’s address (i.e. to the IP address of your firewall). The test script then evaluates whether the firewall let the intrusion attempts in or blocked them. The Security log will also include three corresponding records informing of whether the firewall blocked, only logged or ignored the intrusions (for details, see chapter 22.11). Note: This test is designed only for purposes of the intrusion prevention system built in Kerio Control. It cannot be used for testing of other IDS/IPS. Use of known intruders databases (blacklists) In addition to detection of known intrusion types, it is also possible to detect and block traffic from IP addresses listed in web databases of known intruders (so called blacklists). In this case, all traffic from the IP address is logged and possibly blocked. Such method of detection and blocking of intruders is much faster and also less demanding than detection of individual intrusion types. However, there are also some disadvantages of this method. Blacklists cannot include IP addresses of all possible intruders as the intruders often use fake addresses. Blacklist also may include IP addresses of legitimate clients or servers. Therefore, it is possible to set the same actions for blacklists as for detected intrusions: • Log and drop — information about the detected traffic and blocked IP address will be recorded in the Security log and any network traffic from that IP address will be blocked. • Log — information about the detected traffic and blocked IP address will be only recorded in the Security log, • No action — the detected blacklisted IP address will not be considered as an intruder. Note: Kerio Control does not include the option of custom blacklist adding. Update of intrusions and known intruders databases For correct functionality of the intrusion detection system, it is necessary to update databases of known intrusions and intruder IP addresses regularly. Kerio Control allows to set an interval for regular automatic updates (the default value is 24 hours) and it is also possible to perform an immediate update if needed (e.g. after a longer electricity supply outage). Under usual circumstances there is no reason to disable automatic updates — non-updated databases decrease effectivity of the intrusion prevention 114
8.1 Network intrusion prevention system (IPS) system. Warning: For update of the databases, a valid Kerio Control license or a registered trial version is required. For details see chapter 4. Advanced Options Kerio Control allows to set advanced parameters for the intrusion prevention system. These parameters can increase effectivity of the intrusion prevention system and help avoid so called false positives. However, it is recommended not to change these parameters unless you are absolutely sure about the values! Figure 8.2 Intrusion prevention system advanced options 115
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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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6.1 Persistent connection with a si
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Page 125 and 126: 9.1 DNS module of the firewall’s
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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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