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Line 188: − Configuring your system to force Dansguardian usage & prevent bypassing − Dansguardian uses port 8080 for web proxy requests. If your browser does not use port 8080 then Dansguardian filtering will be bypassed. To force this usage & prevent users bypassing filtering you should do the following 3 steps:+ − + + + + + − 2) Configure your sme server to block direct access to the squid proxy port 3128 & redirect port 80 to port 8080+ − The functionality to create custom firewall rules using iptables is built in to the rpms provided by Stephen Noble & requires enabling with a db command+ − config setprop dansguardian portblocking yes+ + + − To disable portblocking+ − − To enable any/all of the above setting changes you must follow the commands with: Line 206:
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Added Howto
[[Category:Howto]]
[[Category:Howto]]
== Dansguardian ==
'''Dansguardian web content filtering HOWTO install & configure on sme 7.x'''
'''Dansguardian web content filtering HOWTO install & configure on sme 7.x'''
Contributors
'''Contributors'''
Thanks to Stephen Noble at dungog.net for providing rpms & information generally. This HOWTO requires command line control to edit configuration files & restart the dansguardian service after configuration changes.
Thanks to Stephen Noble at dungog.net for providing rpms & information generally. This HOWTO requires command line control to edit configuration files & restart the dansguardian service after configuration changes.
Dungog.net sells a commercial implementation of Dansguardian for sme server which adds a server manager panel to allow GUI control of all Dansguardian functionality & settings.
Dungog.net sells a commercial implementation of Dansguardian for sme server which adds a server manager panel to allow GUI control of all Dansguardian functionality & settings.
Information
'''Information'''
To have a proper understanding of how Dansguardian works and the importance of certain configuration settings you should read the detailed installation notes and Manual at the Dansguardian web site http://dansguardian.org
To have a proper understanding of how Dansguardian works and the importance of certain configuration settings you should read the detailed installation notes and Manual at the Dansguardian web site http://dansguardian.org
The information on the Dansguardian website is of a generic nature and some of it is NOT applicable to sme server installations, refer to the instructions in this HOWTO in preference.
The information on the Dansguardian website is of a generic nature and some of it is NOT applicable to sme server installations, refer to the instructions in this HOWTO in preference.
Installation instructions
'''Installation instructions'''
Warning - Do not upgrade dansguardian v2.9 over previous v2.8 (or earlier) installations as there are substantial changes. (The recommendation from Dansguardian is to edit the new configuration files/lists rather than try to edit your old ones)
Warning - Do not upgrade dansguardian v2.9 over previous v2.8 (or earlier) installations as there are substantial changes. (The recommendation from Dansguardian is to edit the new configuration files/lists rather than try to edit your old ones)
Modifying Dansguardian configuration
'''Modifying Dansguardian configuration'''
You need to manually modify configuration files /etc/dansguardian/dansguardian.conf and /etc/dansguardian/dansguardianf1.conf and /etc/dansguardian/dansguardianf2.conf and /etc/dansguardian/dansguardianfn.conf
You need to manually modify configuration files /etc/dansguardian/dansguardian.conf and /etc/dansguardian/dansguardianf1.conf and /etc/dansguardian/dansguardianf2.conf and /etc/dansguardian/dansguardianfn.conf
Ctrl o an d Ctrl x
Ctrl o an d Ctrl x
Modifying other Dansguardian configuration files
'''Modifying other Dansguardian configuration files'''
You will need to change other config files to suit your site requirements:
You will need to change other config files to suit your site requirements:
Some of the default settings in these files will prevent access to certain web sites and file types, which may conflict with your site requirements. See details in the "Further customisation" section at the end of this Howto or at http://dansguardian.org
Some of the default settings in these files will prevent access to certain web sites and file types, which may conflict with your site requirements. See details in the "Further customisation" section at the end of this Howto or at http://dansguardian.org
Modifying the default html error message page
'''Modifying the default html error message page'''
You may also want to tailor the html template for the error message displayed when Dansguardian blocks a site, see
You may also want to tailor the html template for the error message displayed when Dansguardian blocks a site, see
pico -w /etc/dansguardian/languages/ukenglish/template.html
pico -w /etc/dansguardian/languages/ukenglish/template.html
Starting Dansguardian
'''Starting Dansguardian'''
After install & initial configuration you must manually start Dansguardian to enable web content filtering
After install & initial configuration you must manually start Dansguardian to enable web content filtering
/etc/init.d/dansguardian start
/etc/init.d/dansguardian start
Stopping Dansguardian
'''Stopping Dansguardian'''
If you need to stop Dansguardian (ie to disable filtering or test your system without Dansguardian running)
If you need to stop Dansguardian (ie to disable filtering or test your system without Dansguardian running)
/etc/init.d/dansguardian stop
/etc/init.d/dansguardian stop
Restarting Dansguardian
'''Restarting Dansguardian'''
You will need to restart Dansguardian after making any configuration changes (so they can take effect)
You will need to restart Dansguardian after making any configuration changes (so they can take effect)
/etc/init.d/dansguardian restart
/etc/init.d/dansguardian restart
Status check of Dansguardian
'''Status check of Dansguardian'''
If you need to check that Dansguardian is running
If you need to check that Dansguardian is running
/etc/init.d/dansguardian status
/etc/init.d/dansguardian status
'''Configuring your system to force Dansguardian usage & prevent bypassing'''
1) Configure your sme server to use Transparent Proxy port 8080 instead of the default port 3128
Dansguardian uses port 8080 for web proxy requests. If your browser does not use port 8080 then Dansguardian filtering will be bypassed. To force this usage & prevent users bypassing filtering you should do the following steps:
'''1) Configure your sme server to use Transparent Proxy port 8080 and to block direct access to the squid proxy port 3128 & redirect port 80 to port 8080'''
Note the functionality to create custom firewall rules using iptables is built in to the rpms provided by Stephen Noble
config setprop squid TransparentPort 8080
config setprop squid TransparentPort 8080
config setprop dansguardian portblocking yes
signal-event post-upgrade
reboot
To return Transparent Proxy port to default value and to disable portblocking
config setprop squid TransparentPort 3128
config delprop dansguardian portblocking
config delprop dansguardian portblocking
signal-event post-upgrade
signal-event post-upgrade
reboot
reboot
'''2) Configure your workstation web browser to auto detect proxy port'''
Go to your workstation and open your browser eg Internet Explorer or Firefox or your preferred browser
Go to your workstation and open your browser eg Internet Explorer or Firefox or your preferred browser
Or alternatively use the server IP 192.168.1.1 (or whatever yours is) and use a port of 8080
Or alternatively use the server IP 192.168.1.1 (or whatever yours is) and use a port of 8080
Configuring Dansguardian to use Auth login
'''Configuring Dansguardian to use Auth login'''
This functionality is built in to the rpms provided by Stephen Noble & requires enabling with a db command
This functionality is built in to the rpms provided by Stephen Noble & requires enabling with a db command
config setprop squid RequireAuth pam
config setprop squid RequireAuth pam
or
or
config setprop squid RequireAuth nsca
config setprop squid RequireAuth nsca
or
or
config setprop squid RequireAuth ident
config setprop squid RequireAuth ident
expand-template /etc/squid/squid.conf
expand-template /etc/squid/squid.conf
svc -t /service/squid
svc -t /service/squid
http://dansguardian.org/downloads/michaelpike/DGID.zip
http://dansguardian.org/downloads/michaelpike/DGID.zip
Groups and Auth login
'''Groups and Auth login'''
See http:/dansguardian.org re Group configuration functionality in relation to Auth login (ie filtering users access rights based on group membership)
See http:/dansguardian.org re Group configuration functionality in relation to Auth login (ie filtering users access rights based on group membership)
Testing access
'''Testing access'''
From a workstation web browser go to the site of www.sex.com or www.sex.com.au
From a workstation web browser go to the site of www.sex.com or www.sex.com.au
General information re Blacklists
'''General information re Blacklists'''
You can install blacklists from mesd.k12.or.us or alternatively use the commercial blacklist from URLBlacklist.com
You can install blacklists from mesd.k12.or.us or alternatively use the commercial blacklist from URLBlacklist.com
Further customisation - configuration options
'''Further customisation - configuration options'''
DansGuardian is highly configurable. The source code is available so you have the ultimate in configurability, although most people will be content with modifying the configuration files.
DansGuardian is highly configurable. The source code is available so you have the ultimate in configurability, although most people will be content with modifying the configuration files.
There are two main configuration files, several banned lists and exception lists. These are all explained below:
There are two main configuration files, several banned lists and exception lists. These are all explained below:
exceptionsitelist
'''exceptionsitelist'''
This contains a list of domain endings that if found in the requested URL, DansGuardian will not filter the page. Note that you should not put the http:// or the www. at the beginning of the entries.
This contains a list of domain endings that if found in the requested URL, DansGuardian will not filter the page. Note that you should not put the http:// or the www. at the beginning of the entries.
exceptioniplist
'''exceptioniplist'''
This contains a list of client IPs who you want to bypass the filtering. For example, the network administrator's computer's IP.
This contains a list of client IPs who you want to bypass the filtering. For example, the network administrator's computer's IP.
exceptionuserlist
'''exceptionuserlist'''
Usernames who will not be filtered (basic authentication or ident must be enabled).
Usernames who will not be filtered (basic authentication or ident must be enabled).
exceptionphraselist
'''exceptionphraselist'''
If any of the phrases listed here appear in a web page then the filtering is bypassed. Care should be taken adding phrases to this file as they can easily stop many pages from being blocked. It would be better to put a negative value in the weightedphraselist.
If any of the phrases listed here appear in a web page then the filtering is bypassed. Care should be taken adding phrases to this file as they can easily stop many pages from being blocked. It would be better to put a negative value in the weightedphraselist.
exceptionurllist
'''exceptionurllist'''
URLs in here are for parts of sites that filtering should be switched off for.
URLs in here are for parts of sites that filtering should be switched off for.
bannediplist
'''bannediplist'''
IP addresses of client machines to disallow web access to. Only put IP addresses here, not host names.
IP addresses of client machines to disallow web access to. Only put IP addresses here, not host names.
bannedphraselist
'''bannedphraselist'''
This contains a list of banned phrases. The phrases must be enclosed between < and >. DansGuardian is supplied with an example list. You can not use phrases such as <sex> as this will block sites such as Middlesex University. The phrases can contain spaces. Use them to your advantage. This is the most useful part of DansGuardian and will catch more pages than PICS and URL filtering put together.
This contains a list of banned phrases. The phrases must be enclosed between < and >. DansGuardian is supplied with an example list. You can not use phrases such as <sex> as this will block sites such as Middlesex University. The phrases can contain spaces. Use them to your advantage. This is the most useful part of DansGuardian and will catch more pages than PICS and URL filtering put together.
Combinations of phrases can also be used, which if they are all found in a page, it is blocked. Exception phrases are no longer listed in this file - see exceptionphraselist.
Combinations of phrases can also be used, which if they are all found in a page, it is blocked. Exception phrases are no longer listed in this file - see exceptionphraselist.
banneduserlist
'''banneduserlist'''
Users names, who, if basic proxy authentication is enabled, will automatically be denied web access.
Users names, who, if basic proxy authentication is enabled, will automatically be denied web access.
bannedmimetypelist
'''bannedmimetypelist'''
This contains a list of banned MIME-types. If a URL request returns a MIME-type that is in this list, DansGuardian will block it. DansGuardian comes with some example MIME-types to deny. This is a good way of blocking inappropriate movies for example. It is obviously unwise to ban the MIME-types text/html or image/*.
This contains a list of banned MIME-types. If a URL request returns a MIME-type that is in this list, DansGuardian will block it. DansGuardian comes with some example MIME-types to deny. This is a good way of blocking inappropriate movies for example. It is obviously unwise to ban the MIME-types text/html or image/*.
bannedextensionlist
'''bannedextensionlist'''
This contains a list of banned file extensions. If a URL ends in an extension that is in this list, DansGuardian will block it. DansGuardian comes with some example file extensions to deny. This is a good way of blocking kiddies from downloading those lovely screen savers and hacking tools. You are a fool if you ban the file extension .html, or .jpg etc.
This contains a list of banned file extensions. If a URL ends in an extension that is in this list, DansGuardian will block it. DansGuardian comes with some example file extensions to deny. This is a good way of blocking kiddies from downloading those lovely screen savers and hacking tools. You are a fool if you ban the file extension .html, or .jpg etc.
bannedregexpurllist
'''bannedregexpurllist'''
This contains a list of banned regular expression URLs. For more information on regular expressions, see http://www.opengroup.org/onlinepubs/7908799/xbd/re.html
This contains a list of banned regular expression URLs. For more information on regular expressions, see http://www.opengroup.org/onlinepubs/7908799/xbd/re.html
Regular expressions are a very powerful pattern matching system. This file allows you to match URLs using this method.
Regular expressions are a very powerful pattern matching system. This file allows you to match URLs using this method.
bannedsitelist
'''bannedsitelist'''
This file contains a list of banned sites. Entering a domain name here bans the entire site. For banning specific parts of a site, see bannedurllist. Also, you can have a blanket ban all sites except those specifically excluded in exceptionsitelist. You can also block sites specified only as an IP address, and include a stock squidGuard blacklists collection. To enable these blacklists, download them from the extras section http://dansguardian.org/?page=extras
This file contains a list of banned sites. Entering a domain name here bans the entire site. For banning specific parts of a site, see bannedurllist. Also, you can have a blanket ban all sites except those specifically excluded in exceptionsitelist. You can also block sites specified only as an IP address, and include a stock squidGuard blacklists collection. To enable these blacklists, download them from the extras section http://dansguardian.org/?page=extras
Simply put them somewhere appropriate, un-comment the squidGuard blacklists collection lines at the bottom of the bannedsitelist file, and check the paths are correct. For URL blacklists, edit the bannedurllist in a similar way.
Simply put them somewhere appropriate, un-comment the squidGuard blacklists collection lines at the bottom of the bannedsitelist file, and check the paths are correct. For URL blacklists, edit the bannedurllist in a similar way.
bannedurllist
'''bannedurllist'''
This allows you to block specific parts of a site rather than the whole site. To block an entire site, see bannedsitelist. To enable squidGuard blacklists for URLs, you will need to download the blacklists and edit the squidGuard blacklists collection section at the bottom (as for bannedsitelist above).
This allows you to block specific parts of a site rather than the whole site. To block an entire site, see bannedsitelist. To enable squidGuard blacklists for URLs, you will need to download the blacklists and edit the squidGuard blacklists collection section at the bottom (as for bannedsitelist above).
weightedphraselist
'''weightedphraselist'''
Each phrase is given a value either positive or negative and the values are added up. Phrases to do with good subjects will have negative values, and bad subjects will have positive values. Once the naughtyness limit is reached (within dansguardian.conf), the page is blocked. See the Naughtyness Limit description within the dansguardian.conf section below.
Each phrase is given a value either positive or negative and the values are added up. Phrases to do with good subjects will have negative values, and bad subjects will have positive values. Once the naughtyness limit is reached (within dansguardian.conf), the page is blocked. See the Naughtyness Limit description within the dansguardian.conf section below.
pics
'''pics'''
This file allows you to finely tune the PICS filtering. Each PICS section comes with a description of the allowed settings and what they represent. The default settings with DansGuardian are set for youngish children, for example mild profanities and artistic nudity are allowed. PICS filtering can also be totally disabled / enabled using the enablePICS = on | off option.
This file allows you to finely tune the PICS filtering. Each PICS section comes with a description of the allowed settings and what they represent. The default settings with DansGuardian are set for youngish children, for example mild profanities and artistic nudity are allowed. PICS filtering can also be totally disabled / enabled using the enablePICS = on | off option.
For more detailed information on PICS ratings, see http://www.w3.org/PICS/
For more detailed information on PICS ratings, see http://www.w3.org/PICS/
'''contentregexplist'''
ICRA
'''ICRA'''
The ICRA section is fairly self-explanatory. A value of 0 means nothing of that category is allowed, whereas a value of 1 allows it. For example,
The ICRA section is fairly self-explanatory. A value of 0 means nothing of that category is allowed, whereas a value of 1 allows it. For example,
allows nude art. For more in-depth information see http://www.rsac.org/
allows nude art. For more in-depth information see http://www.rsac.org/
'''RSAC'''
RSAC
RSAC is an older version of ICRA. The values here range from 0 meaning none allowed, through 2 (the default value), to 4, which allows wanton and gratuitous amounts of the given category. For more in-depth information see http://www.rsac.org/
RSAC is an older version of ICRA. The values here range from 0 meaning none allowed, through 2 (the default value), to 4, which allows wanton and gratuitous amounts of the given category. For more in-depth information see http://www.rsac.org/
'''evaluWEB'''
evaluWEB
evaluWEB rating uses a system similar to the British Film classification system:
evaluWEB rating uses a system similar to the British Film classification system:
2 = 18 (Only suitable for viewers aged 18 and over)
2 = 18 (Only suitable for viewers aged 18 and over)
SafeSurf
'''SafeSurf'''
Similar to RSAC, but containing a larger range of categories with the range from 0 = full filtering to 9 = wanton and gratuitous. For more in-depth information, see http://www.safesurf.com
Similar to RSAC, but containing a larger range of categories with the range from 0 = full filtering to 9 = wanton and gratuitous. For more in-depth information, see http://www.safesurf.com
'''Weburbia'''
Weburbia
See evaluWEB. For more in-depth information, see http://www.weburbia.com/safe/index.shtml
See evaluWEB. For more in-depth information, see http://www.weburbia.com/safe/index.shtml
'''Vancouver Webpages'''
Vancouver Webpages
This is yet another ratings scheme. See http://vancouver-webpages.com/VWP1.0/
This is yet another ratings scheme. See http://vancouver-webpages.com/VWP1.0/
dansguardian.conf & dansguardianf1.conf
'''dansguardian.conf & dansguardianf1.conf'''
The only setting that is vital for you to configure in the dansguardian.conf file is the accessdeniedaddress setting. You should set this to the address (not the file path) of your Apache server with the perl access denied reporting script. For most people this will be the same server as squid and DansGuardian. If you really want you can change this address to a normal html static page on any server.
The only setting that is vital for you to configure in the dansguardian.conf file is the accessdeniedaddress setting. You should set this to the address (not the file path) of your Apache server with the perl access denied reporting script. For most people this will be the same server as squid and DansGuardian. If you really want you can change this address to a normal html static page on any server.
Reporting Level
'''Reporting Level'''
You can change the reporting level for when a page gets denied. It can say just 'Access Denied', or report why, or report why and what the denied phrase is. The latter may be more useful for testing, but the middler would be more useful in a school environment. Stealth mode logs what would be denied but doesn't do any blocking.
You can change the reporting level for when a page gets denied. It can say just 'Access Denied', or report why, or report why and what the denied phrase is. The latter may be more useful for testing, but the middler would be more useful in a school environment. Stealth mode logs what would be denied but doesn't do any blocking.
Logging Settings
'''Logging Settings'''
This setting lets you configure the logging level. You can log nothing, just denied pages, text based and all requests. HTTPS requests only get logged when the logging is set to 3 - all requests.
This setting lets you configure the logging level. You can log nothing, just denied pages, text based and all requests. HTTPS requests only get logged when the logging is set to 3 - all requests.
Log Exception Hits
'''Log Exception Hits'''
Log if an exception (user, ip, URL, or phrase) is matched and so the page gets let through. This can be useful for diagnosing why a site gets through the filter.
Log if an exception (user, ip, URL, or phrase) is matched and so the page gets let through. This can be useful for diagnosing why a site gets through the filter.
Log File Format
'''Log File Format'''
This setting alters the format of the DansGuardian log file. Please note option 3 (standard log format) is not yet unimplemented.
This setting alters the format of the DansGuardian log file. Please note option 3 (standard log format) is not yet unimplemented.
Network Settings
'''Network Settings'''
These allow you to modify the IP address that DansGuardian is listening on, the port DansGuardian listens on, the IP address of the server running squid as well as the squid port. It is possible to configure the Access Denied reporting page here also.
These allow you to modify the IP address that DansGuardian is listening on, the port DansGuardian listens on, the IP address of the server running squid as well as the squid port. It is possible to configure the Access Denied reporting page here also.
Content Filtering Settings
'''Content Filtering Settings'''
Here you can modify the location of the list files. Adjusting these locations is not recommended.
Here you can modify the location of the list files. Adjusting these locations is not recommended.
Naughtyness limit
'''Naughtyness limit'''
This setting refers to the weighted phrase limit over which the page will be blocked. Each weighted phrase is given a value either positive or negative and the values added up. Phrases to do with good subjects will have negative values, and bad subjects will have positive values. See the weightedphraselist file for examples. As a rough guide, a value of 50 is for young children, 100 for older children, 160 for young adults.
This setting refers to the weighted phrase limit over which the page will be blocked. Each weighted phrase is given a value either positive or negative and the values added up. Phrases to do with good subjects will have negative values, and bad subjects will have positive values. See the weightedphraselist file for examples. As a rough guide, a value of 50 is for young children, 100 for older children, 160 for young adults.
Show weighted phrases found
'''Show weighted phrases found'''
If enabled then the phrases found that made up the total which exceeds the naughtyness limit will be logged and, if the reporting level is high enough, reported.
If enabled then the phrases found that made up the total which exceeds the naughtyness limit will be logged and, if the reporting level is high enough, reported.
Reverse Lookups for Banned Sites and URLs
'''Reverse Lookups for Banned Sites and URLs'''
If set to on, DansGuardian will look up the forward DNS for an IP URL address and search for both in the banned site and URL lists. This would prevent a user from simply entering the IP for a banned address. It will reduce searching speed somewhat so unless you have a local caching DNS server, leave it off and use the Blanket IP Block option in the bannedsitelist file instead.
If set to on, DansGuardian will look up the forward DNS for an IP URL address and search for both in the banned site and URL lists. This would prevent a user from simply entering the IP for a banned address. It will reduce searching speed somewhat so unless you have a local caching DNS server, leave it off and use the Blanket IP Block option in the bannedsitelist file instead.
Build bannedsitelist and bannedurllist Cache Files
'''Build bannedsitelist and bannedurllist Cache Files'''
This will compare the date stamp of the list file with the date stamp of the cache file and will recreate as needed. If a bsl or bul .processed file exists, then that will be used instead. It will increase process start speed by 300%. On slow computers this will be significant. Fast computers do not need this option.
This will compare the date stamp of the list file with the date stamp of the cache file and will recreate as needed. If a bsl or bul .processed file exists, then that will be used instead. It will increase process start speed by 300%. On slow computers this will be significant. Fast computers do not need this option.
POST protection (web upload and forms)
'''POST protection (web upload and forms)'''
This is for blocking or limiting uploads, not for blocking forms without any file upload. The value is given in kilobytes after MIME encoding and header information.
This is for blocking or limiting uploads, not for blocking forms without any file upload. The value is given in kilobytes after MIME encoding and header information.
Username identification methods (used in logging)
'''Username identification methods (used in logging)'''
The proxyauth option is for when basic proxy authentication is used (obviously no good for transparent proxying). The ntlm option is for when the proxy supports the MS NTLM authentication. This only works with IE5.5 sp1 and later, and has not been implemented yet. The ident option causes DansGuardian to try to connect to an identd server on the computer originating the request.
The proxyauth option is for when basic proxy authentication is used (obviously no good for transparent proxying). The ntlm option is for when the proxy supports the MS NTLM authentication. This only works with IE5.5 sp1 and later, and has not been implemented yet. The ident option causes DansGuardian to try to connect to an identd server on the computer originating the request.
Forwarded For
'''Forwarded For'''
This option adds an X-Forwarded-For: <clientIP> to the HTTP request header. This may help solve some problem sites that need to know the source IP.
This option adds an X-Forwarded-For: <clientIP> to the HTTP request header. This may help solve some problem sites that need to know the source IP.
Max Children
'''Max Children'''
This sets the maximum number of processes to spawn to handle the incoming connections. This will prevent DoS attacks killing the server with too many spawned processes. On large sites you might want to double or triple this number.
This sets the maximum number of processes to spawn to handle the incoming connections. This will prevent DoS attacks killing the server with too many spawned processes. On large sites you might want to double or triple this number.
Log Connection Handling Errors
'''Log Connection Handling Errors'''
This option logs some debug info regarding fork()ing and accept()ing which can usually be ignored. These are logged by syslog. It is safe to leave this setting on or off.
This option logs some debug info regarding fork()ing and accept()ing which can usually be ignored. These are logged by syslog. It is safe to leave this setting on or off.