Petter Reinholdtsen: Automatic proxy configuration with Debian Edu / Skolelinux

+function FindProxyForURL(url, host) +{ + if (!isResolvable(host) || + isPlainHostName(host) || + dnsDomainIs(host, ".intern")) + return "DIRECT"; + else + return "PROXY webcache:3128; DIRECT"; +} +

@@ -244,7 +334,7 @@ vil ha det.

January (7)

February (3)

February (4)

@@ -365,11 +455,11 @@ vil ha det.

diff --git a/blog/data/2012-02-13-skolelinux-wpad.txt b/blog/data/2012-02-13-skolelinux-wpad.txt index f66047166a..111f2e2353 100644 --- a/blog/data/2012-02-13-skolelinux-wpad.txt +++ b/blog/data/2012-02-13-skolelinux-wpad.txt @@ -6,9 +6,12 @@ Date: 2012-02-13 23:40 Debian Edu / Skolelinux is the ability for clients to automatically configure their proxy settings based on their environment. We want all systems on the client to use -the WPAD based proxy definition fetched from http://wpad/wpad.dat, to +the WPAD based proxy definition fetched from http://wpad/wpad.dat, to allow sites to control the proxy setting from a central place and make -sure clients do not have hardcoded proxy settings.

+sure clients do not have hard coded proxy settings. The schools can +change the global proxy setting by editing +tjener:/etc/debian-edu/www/wpad.dat and the change propagate +to all Debian Edu clients in the network.

The problem is that some systems do not understand the WPAD system. In other words, how do one get from a WPAD file like this (this is a @@ -31,20 +34,21 @@ function FindProxyForURL(url, host)

http_proxy=http://webcache:3128/
 ftp_proxy=http://webcache:3128/
-
+

To do this conversion I developed a perl script that will execute the javascript fragment in the WPAD file and return the proxy that -would be used for http://www.debian.org/, and insert this extracted -proxy URL in /etc/environment and /etc/apt/apt.conf. The perl script -wpad-extract work just fine in Squeeze, but in Wheezy the library it -need to run the javascript code is -no longer able to build -because the C library it depended on is now a C++ library. I hope -someone find a solution to that problem before Wheezy is frozen. An -alternative would be for us to rewrite wpad-extract to use some other -javascript library currently working in Wheezy, but no known -alternative is known at the moment.
+would be used for +http://www.debian.org/, +and insert this extracted proxy URL in /etc/environment and +/etc/apt/apt.conf. The perl script wpad-extract work just +fine in Squeeze, but in Wheezy the library it need to run the +javascript code is no longer +able to build because the C library it depended on is now a C++ +library. I hope someone find a solution to that problem before Wheezy +is frozen. An alternative would be for us to rewrite wpad-extract to +use some other javascript library currently working in Wheezy, but no +known alternative is known at the moment.

This automatic proxy system allow the roaming workstation (aka laptop) setup in Debian Edu/Squeeze to use the proxy when the laptop @@ -53,7 +57,7 @@ automatically use any proxy present and announced using the WPAD feature when it is connected to other networks. And if no proxy is announced, direct connections will be used instead.
-
Silenty using a proxy announced on the network might be a privacy +
Silently using a proxy announced on the network might be a privacy or security problem. But those controlling DHCP and DNS on a network could just as easily set up a transparent proxy, and force all HTTP and FTP connections to use a proxy anyway, so I consider that @@ -61,7 +65,7 @@ distinction to be academic. If you are afraid of using the wrong proxy, you should avoid connecting to the network in question in the first place. In Debian Edu, the proxy setup is updated using dhcp and ifupdown hooks, to make sure the configuration is updated every time -the newtork setup changes.
+the network setup changes.
The WPAD system is documented in a IETF diff --git a/blog/draft/2012-02-07-skolelinux-wpad.txt b/blog/draft/2012-02-07-skolelinux-wpad.txt deleted file mode 100644 index ee196acb56..0000000000 --- a/blog/draft/2012-02-07-skolelinux-wpad.txt +++ /dev/null @@ -1,65 +0,0 @@ -Title: Automatic proxy configuration with Debian Edu / Skolelinux -Tags: english, debian edu -Date: 2012-02-07 09:45 -Publish: 2012-02-07 12:00 - -
New in the Squeeze version of -Debian Edu / Skolelinux is the -ability for clients to automatically configure their proxy settings -based on their environment. We want all systems on the client to use -the WPAD based proxy definition fetched from http://wpad/wpad.dat, to -allow sites to control the proxy setting from a central place and make -sure clients do not have hardcoded proxy settings.
- -
The problem is that some systems do not understand the WPAD system. -In other words, how do one get from a WPAD file like this (this is a -simple one, they can run arbitrary code):
- -
- -to a proxy setting in the environment like this: - -
-http_proxy=http://webcache:3128/
-ftp_proxy=http://webcache:3128/
-
- -
To do this I developed a perl script that will execute the -javascript fragment in the WPAD file and return the proxy that would -be used for http://www.debian.org/, and insert this extracted proxy -URL in /etc/environment and /etc/apt/apt.conf. The perl script -wpad-extract work just fine in Squeeze, but in Wheezy the library it -need to run the javascript code is -no longer able to build -because the C library it depended on is now a C++ library. I hope -someone find a solution to that problem before Wheezy is frozen. An -alternative would be for us to rewrite wpad-extract to use some other -javascript library currently working in Wheezy.
- -
This setup allow the laptop setup in Debian Edu/Squeeze to use the -proxy when the laptop is connected to the backbone network in a Debian -Edu setup, and to automatically use any proxy present and announced -using the WPAD feature when it is conncted to other networks.
- -
Silenty using a proxy announced on the network might be a privacy -or security problem. But those controlling DHCP and DNS on a network -could just as easily set up a transparent proxy, and force all HTTP -and FTP connections to use a proxy anyway, so I consider that -distinction to be academic. If you are afraid of using the wrong -proxy, you should avoid connecting to the network in question in the -first place.
- -http://tools.ietf.org/html/draft-ietf-wrec-wpad-01 -http://en.wikipedia.org/wiki/Web_Proxy_Autodiscovery_Protocol - - - ifupdown/dhcp hook diff --git a/blog/index.html b/blog/index.html index 24d4f2adef..91f4f77ab1 100644 --- a/blog/index.html +++ b/blog/index.html @@ -19,6 +19,90 @@ +
+
Automatic proxy configuration with Debian Edu / Skolelinux
+
13th February 2012
+
New in the Squeeze version of +Debian Edu / Skolelinux is the +ability for clients to automatically configure their proxy settings +based on their environment. We want all systems on the client to use +the WPAD based proxy definition fetched from http://wpad/wpad.dat, to +allow sites to control the proxy setting from a central place and make +sure clients do not have hard coded proxy settings. The schools can +change the global proxy setting by editing +tjener:/etc/debian-edu/www/wpad.dat and the change propagate +to all Debian Edu clients in the network.
+ +
The problem is that some systems do not understand the WPAD system. +In other words, how do one get from a WPAD file like this (this is a +simple one, they can run arbitrary code):
+ +
+function FindProxyForURL(url, host)
+{
+ if (!isResolvable(host) ||
+ isPlainHostName(host) ||
+ dnsDomainIs(host, ".intern"))
+ return "DIRECT";
+ else
+ return "PROXY webcache:3128; DIRECT";
+}
+
+ +
to a proxy setting in the process environment looking like this:
+ +
+http_proxy=http://webcache:3128/
+ftp_proxy=http://webcache:3128/
+
+ +
To do this conversion I developed a perl script that will execute +the javascript fragment in the WPAD file and return the proxy that +would be used for +http://www.debian.org/, +and insert this extracted proxy URL in /etc/environment and +/etc/apt/apt.conf. The perl script wpad-extract work just +fine in Squeeze, but in Wheezy the library it need to run the +javascript code is no longer +able to build because the C library it depended on is now a C++ +library. I hope someone find a solution to that problem before Wheezy +is frozen. An alternative would be for us to rewrite wpad-extract to +use some other javascript library currently working in Wheezy, but no +known alternative is known at the moment.
+ +
This automatic proxy system allow the roaming workstation (aka +laptop) setup in Debian Edu/Squeeze to use the proxy when the laptop +is connected to the backbone network in a Debian Edu setup, and to +automatically use any proxy present and announced using the WPAD +feature when it is connected to other networks. And if no proxy is +announced, direct connections will be used instead.
+ +
Silently using a proxy announced on the network might be a privacy +or security problem. But those controlling DHCP and DNS on a network +could just as easily set up a transparent proxy, and force all HTTP +and FTP connections to use a proxy anyway, so I consider that +distinction to be academic. If you are afraid of using the wrong +proxy, you should avoid connecting to the network in question in the +first place. In Debian Edu, the proxy setup is updated using dhcp and +ifupdown hooks, to make sure the configuration is updated every time +the network setup changes.
+ +The WPAD system is documented in a +IETF +draft and a +Wikipedia +page for those that want to learn more. +
+
+ + + Tags: debian edu, english. + + +
+
+
+

Skolelinux-intervju: Axel Bojer

7th February 2012
@@ -570,52 +654,6 @@ on the project announcement list.

-
-
Fixing an hanging debian installer for Debian Edu
-
3rd January 2012
-
During christmas, I have been working getting the next version of -Debian Edu / Skolelinux ready -for release. The initial problem I looked at was particularly -interesting.
- -
The installer would hang at the end when it was doing it -post-installation configuration, and whatevery I did to try to find -the cause and fix it always worked while I tested it, but never when I -integrated it into the installer and ran the installation from -scratch. I would try to restart processes, close file descriptors, -remove or create files, and the installer would always unblock and -wrap up its tasks.
- -
Eventually the cause was found. The kernel was simply running out -of entropy, causing the Kerberos setup to hang waiting for more. -Pressing keys was adding entropy to the kernel, and thus all my tries -to fix the problem worked not because what I was typing to fix it, but -because I was typing.
- -
The fix I implemented was to add a background process looking at -the level of entropy in the kernel (by checking -/proc/sys/kernel/random/entropy_avail), and if it was too small, the -installer will flush the kernel file buffers and do 'find /' to -generate some disk IO. Disk IO generate entropy in the kernel, and is -one of the few things that can be initated from within the system to -generate entropy.
- -
The fix is in -beta1 -of the Debian Edu/Squeeze version, and we -welcome more testers and -developers. We plan to release beta2 this weekend.
-
-
- - - Tags: debian edu, english. - - -
-
-
-

@@ -629,7 +667,7 @@ developers. We plan to release beta2 this weekend.

January (7)
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February (4)
@@ -750,11 +788,11 @@ developers. We plan to release beta2 this weekend.

debian (54)
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debian edu (74)
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debian edu (75)

digistan (7)
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english (105)
+
english (106)

fiksgatami (13)
diff --git a/blog/index.rss b/blog/index.rss index 4b2767ba55..0ceaf9dd0b 100644 --- a/blog/index.rss +++ b/blog/index.rss @@ -6,6 +6,84 @@ http://people.skolelinux.org/pere/blog/ + + Automatic proxy configuration with Debian Edu / Skolelinux + http://people.skolelinux.org/pere/blog/Automatic_proxy_configuration_with_Debian_Edu___Skolelinux.html + http://people.skolelinux.org/pere/blog/Automatic_proxy_configuration_with_Debian_Edu___Skolelinux.html + Mon, 13 Feb 2012 23:40:00 +0100 + New in the Squeeze version of +<a href="http://www.skolelinux.org/">Debian Edu / Skolelinux</a> is the +ability for clients to automatically configure their proxy settings +based on their environment. We want all systems on the client to use +the WPAD based proxy definition fetched from <tt>http://wpad/wpad.dat</tt>, to +allow sites to control the proxy setting from a central place and make +sure clients do not have hard coded proxy settings. The schools can +change the global proxy setting by editing +<tt>tjener:/etc/debian-edu/www/wpad.dat</tt> and the change propagate +to all Debian Edu clients in the network. + +The problem is that some systems do not understand the WPAD system. +In other words, how do one get from a WPAD file like this (this is a +simple one, they can run arbitrary code): + +<blockquote><pre> +function FindProxyForURL(url, host) +{ + if (!isResolvable(host) || + isPlainHostName(host) || + dnsDomainIs(host, ".intern")) + return "DIRECT"; + else + return "PROXY webcache:3128; DIRECT"; +} +</pre></blockquote> + +to a proxy setting in the process environment looking like this: + +<blockquote><pre> +http_proxy=http://webcache:3128/ +ftp_proxy=http://webcache:3128/ +</pre></blockquote> + +To do this conversion I developed a perl script that will execute +the javascript fragment in the WPAD file and return the proxy that +would be used for +<tt><a href="http://www.debian.org/">http://www.debian.org/</a></tt>, +and insert this extracted proxy URL in <tt>/etc/environment</tt> and +<tt>/etc/apt/apt.conf</tt>. The perl script wpad-extract work just +fine in Squeeze, but in Wheezy the library it need to run the +javascript code is <a href="http://bugs.debian.org/631045">no longer +able to build</a> because the C library it depended on is now a C++ +library. I hope someone find a solution to that problem before Wheezy +is frozen. An alternative would be for us to rewrite wpad-extract to +use some other javascript library currently working in Wheezy, but no +known alternative is known at the moment. + +This automatic proxy system allow the roaming workstation (aka +laptop) setup in Debian Edu/Squeeze to use the proxy when the laptop +is connected to the backbone network in a Debian Edu setup, and to +automatically use any proxy present and announced using the WPAD +feature when it is connected to other networks. And if no proxy is +announced, direct connections will be used instead. + +Silently using a proxy announced on the network might be a privacy +or security problem. But those controlling DHCP and DNS on a network +could just as easily set up a transparent proxy, and force all HTTP +and FTP connections to use a proxy anyway, so I consider that +distinction to be academic. If you are afraid of using the wrong +proxy, you should avoid connecting to the network in question in the +first place. In Debian Edu, the proxy setup is updated using dhcp and +ifupdown hooks, to make sure the configuration is updated every time +the network setup changes. + +The WPAD system is documented in a +<a href="http://tools.ietf.org/html/draft-ietf-wrec-wpad-01">IETF +draft</a> and a +<a href="http://en.wikipedia.org/wiki/Web_Proxy_Autodiscovery_Protocol">Wikipedia +page</a> for those that want to learn more. + + + Skolelinux-intervju: Axel Bojer http://people.skolelinux.org/pere/blog/Skolelinux_intervju__Axel_Bojer.html @@ -503,45 +581,5 @@ on the project announcement list. - - Fixing an hanging debian installer for Debian Edu - http://people.skolelinux.org/pere/blog/Fixing_an_hanging_debian_installer_for_Debian_Edu.html - http://people.skolelinux.org/pere/blog/Fixing_an_hanging_debian_installer_for_Debian_Edu.html - Tue, 3 Jan 2012 11:25:00 +0100 - During christmas, I have been working getting the next version of -<a href="http://www.skolelinux.org/">Debian Edu / Skolelinux</a> ready -for release. The initial problem I looked at was particularly -interesting. - -The installer would hang at the end when it was doing it -post-installation configuration, and whatevery I did to try to find -the cause and fix it always worked while I tested it, but never when I -integrated it into the installer and ran the installation from -scratch. I would try to restart processes, close file descriptors, -remove or create files, and the installer would always unblock and -wrap up its tasks. - -Eventually the cause was found. The kernel was simply running out -of entropy, causing the Kerberos setup to hang waiting for more. -Pressing keys was adding entropy to the kernel, and thus all my tries -to fix the problem worked not because what I was typing to fix it, but -because I was typing. - -The fix I implemented was to add a background process looking at -the level of entropy in the kernel (by checking -/proc/sys/kernel/random/entropy_avail), and if it was too small, the -installer will flush the kernel file buffers and do 'find /' to -generate some disk IO. Disk IO generate entropy in the kernel, and is -one of the few things that can be initated from within the system to -generate entropy. - -The fix is in -<a href="http://wiki.debian.org/DebianEdu/Documentation/Squeeze/Installation">beta1 -of the Debian Edu/Squeeze</a> version, and we -<a href="http://wiki.debian.org/DebianEdu">welcome more testers and -developers</a>. We plan to release beta2 this weekend. - - - diff --git a/blog/jXplorer__a_very_nice_LDAP_GUI.html b/blog/jXplorer__a_very_nice_LDAP_GUI.html index 2ae5341154..ff41462169 100644 --- a/blog/jXplorer__a_very_nice_LDAP_GUI.html +++ b/blog/jXplorer__a_very_nice_LDAP_GUI.html @@ -56,7 +56,7 @@ and remove the failing query. Nothing big, but very annoying.

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@@ -177,11 +177,11 @@ and remove the failing query. Nothing big, but very annoying.

debian (54)
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debian edu (74)
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debian edu (75)

digistan (7)
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english (105)
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english (106)

fiksgatami (13)
diff --git a/blog/sitemap.xml b/blog/sitemap.xml index 94c1d97a5c..56ab75f500 100644 --- a/blog/sitemap.xml +++ b/blog/sitemap.xml @@ -100,6 +100,11 @@ 0.50 weekly + + http://people.skolelinux.org/pere/blog/Automatic_proxy_configuration_with_Debian_Edu___Skolelinux.html + 0.50 + weekly + http://people.skolelinux.org/pere/blog/Automatic_upgrade_testing_from_Lenny_to_Squeeze.html 0.50 diff --git a/blog/systemd__an_interesting_alternative_to_upstart.html b/blog/systemd__an_interesting_alternative_to_upstart.html index 7713f6b276..31e07b31ba 100644 --- a/blog/systemd__an_interesting_alternative_to_upstart.html +++ b/blog/systemd__an_interesting_alternative_to_upstart.html @@ -74,7 +74,7 @@ with parallel booting enabled by default.

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@@ -195,11 +195,11 @@ with parallel booting enabled by default.

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fiksgatami (13)
diff --git a/blog/tags/3d-printer/index.html b/blog/tags/3d-printer/index.html index b4cd3293ac..b48dc679c3 100644 --- a/blog/tags/3d-printer/index.html +++ b/blog/tags/3d-printer/index.html @@ -608,7 +608,7 @@ very cool 3D scanner.

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@@ -729,11 +729,11 @@ very cool 3D scanner.

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fiksgatami (13)
diff --git a/blog/tags/amiga/index.html b/blog/tags/amiga/index.html index 3f795af7d1..d78e7a4fba 100644 --- a/blog/tags/amiga/index.html +++ b/blog/tags/amiga/index.html @@ -62,7 +62,7 @@ pakke. Kanskje Aros kunne vÃ¦rt interessant for et NUUG-foredrag?

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@@ -183,11 +183,11 @@ pakke. Kanskje Aros kunne vÃ¦rt interessant for et NUUG-foredrag?

debian (54)
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debian edu (74)
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debian edu (75)

digistan (7)
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fiksgatami (13)
diff --git a/blog/tags/aros/index.html b/blog/tags/aros/index.html index 557bbbdef1..4b87789329 100644 --- a/blog/tags/aros/index.html +++ b/blog/tags/aros/index.html @@ -62,7 +62,7 @@ pakke. Kanskje Aros kunne vÃ¦rt interessant for et NUUG-foredrag?

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@@ -183,11 +183,11 @@ pakke. Kanskje Aros kunne vÃ¦rt interessant for et NUUG-foredrag?

debian (54)
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debian edu (74)
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debian edu (75)

digistan (7)
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english (105)
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english (106)

fiksgatami (13)
diff --git a/blog/tags/bitcoin/index.html b/blog/tags/bitcoin/index.html index 118867386c..975d96dfcd 100644 --- a/blog/tags/bitcoin/index.html +++ b/blog/tags/bitcoin/index.html @@ -191,7 +191,7 @@ equally valid for gold, which was used as a currency for many years.

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@@ -312,11 +312,11 @@ equally valid for gold, which was used as a currency for many years.

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diff --git a/blog/tags/bootsystem/index.html b/blog/tags/bootsystem/index.html index 7837e8a6e5..bc18296362 100644 --- a/blog/tags/bootsystem/index.html +++ b/blog/tags/bootsystem/index.html @@ -769,7 +769,7 @@ from when sysvinit was introduced into Debian, a long time ago.

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@@ -890,11 +890,11 @@ from when sysvinit was introduced into Debian, a long time ago.

debian (54)
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fiksgatami (13)
diff --git a/blog/tags/bsa/index.html b/blog/tags/bsa/index.html index 222f1ad29e..829a40f225 100644 --- a/blog/tags/bsa/index.html +++ b/blog/tags/bsa/index.html @@ -150,7 +150,7 @@ fÃ¸re til at flere tar i bruk fri programvare.

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@@ -271,11 +271,11 @@ fÃ¸re til at flere tar i bruk fri programvare.

debian (54)
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fiksgatami (13)
diff --git a/blog/tags/debian edu/debian edu.rss b/blog/tags/debian edu/debian edu.rss index 4b32ce05b2..1ed46c99ff 100644 --- a/blog/tags/debian edu/debian edu.rss +++ b/blog/tags/debian edu/debian edu.rss @@ -5786,5 +5786,83 @@ vil ha det. + + Automatic proxy configuration with Debian Edu / Skolelinux + http://people.skolelinux.org/pere/blog/Automatic_proxy_configuration_with_Debian_Edu___Skolelinux.html + http://people.skolelinux.org/pere/blog/Automatic_proxy_configuration_with_Debian_Edu___Skolelinux.html + Mon, 13 Feb 2012 23:40:00 +0100 + New in the Squeeze version of +<a href="http://www.skolelinux.org/">Debian Edu / Skolelinux</a> is the +ability for clients to automatically configure their proxy settings +based on their environment. We want all systems on the client to use +the WPAD based proxy definition fetched from <tt>http://wpad/wpad.dat</tt>, to +allow sites to control the proxy setting from a central place and make +sure clients do not have hard coded proxy settings. The schools can +change the global proxy setting by editing +<tt>tjener:/etc/debian-edu/www/wpad.dat</tt> and the change propagate +to all Debian Edu clients in the network. + +The problem is that some systems do not understand the WPAD system. +In other words, how do one get from a WPAD file like this (this is a +simple one, they can run arbitrary code): + +<blockquote><pre> +function FindProxyForURL(url, host) +{ + if (!isResolvable(host) || + isPlainHostName(host) || + dnsDomainIs(host, ".intern")) + return "DIRECT"; + else + return "PROXY webcache:3128; DIRECT"; +} +</pre></blockquote> + +to a proxy setting in the process environment looking like this: + +<blockquote><pre> +http_proxy=http://webcache:3128/ +ftp_proxy=http://webcache:3128/ +</pre></blockquote> + +To do this conversion I developed a perl script that will execute +the javascript fragment in the WPAD file and return the proxy that +would be used for +<tt><a href="http://www.debian.org/">http://www.debian.org/</a></tt>, +and insert this extracted proxy URL in <tt>/etc/environment</tt> and +<tt>/etc/apt/apt.conf</tt>. The perl script wpad-extract work just +fine in Squeeze, but in Wheezy the library it need to run the +javascript code is <a href="http://bugs.debian.org/631045">no longer +able to build</a> because the C library it depended on is now a C++ +library. I hope someone find a solution to that problem before Wheezy +is frozen. An alternative would be for us to rewrite wpad-extract to +use some other javascript library currently working in Wheezy, but no +known alternative is known at the moment. + +This automatic proxy system allow the roaming workstation (aka +laptop) setup in Debian Edu/Squeeze to use the proxy when the laptop +is connected to the backbone network in a Debian Edu setup, and to +automatically use any proxy present and announced using the WPAD +feature when it is connected to other networks. And if no proxy is +announced, direct connections will be used instead. + +Silently using a proxy announced on the network might be a privacy +or security problem. But those controlling DHCP and DNS on a network +could just as easily set up a transparent proxy, and force all HTTP +and FTP connections to use a proxy anyway, so I consider that +distinction to be academic. If you are afraid of using the wrong +proxy, you should avoid connecting to the network in question in the +first place. In Debian Edu, the proxy setup is updated using dhcp and +ifupdown hooks, to make sure the configuration is updated every time +the network setup changes. + +The WPAD system is documented in a +<a href="http://tools.ietf.org/html/draft-ietf-wrec-wpad-01">IETF +draft</a> and a +<a href="http://en.wikipedia.org/wiki/Web_Proxy_Autodiscovery_Protocol">Wikipedia +page</a> for those that want to learn more. + + + diff --git a/blog/tags/debian edu/index.html b/blog/tags/debian edu/index.html index 66faaee906..9d253f9515 100644 --- a/blog/tags/debian edu/index.html +++ b/blog/tags/debian edu/index.html @@ -6688,6 +6688,96 @@ vil ha det.

+
+
+ Automatic proxy configuration with Debian Edu / Skolelinux +
+
+ 13th February 2012 +
+
+
New in the Squeeze version of +Debian Edu / Skolelinux is the +ability for clients to automatically configure their proxy settings +based on their environment. We want all systems on the client to use +the WPAD based proxy definition fetched from http://wpad/wpad.dat, to +allow sites to control the proxy setting from a central place and make +sure clients do not have hard coded proxy settings. The schools can +change the global proxy setting by editing +tjener:/etc/debian-edu/www/wpad.dat and the change propagate +to all Debian Edu clients in the network.
+ +
The problem is that some systems do not understand the WPAD system. +In other words, how do one get from a WPAD file like this (this is a +simple one, they can run arbitrary code):
+ +
+function FindProxyForURL(url, host)
+{
+ if (!isResolvable(host) ||
+ isPlainHostName(host) ||
+ dnsDomainIs(host, ".intern"))
+ return "DIRECT";
+ else
+ return "PROXY webcache:3128; DIRECT";
+}
+
+ +
to a proxy setting in the process environment looking like this:
+ +
+http_proxy=http://webcache:3128/
+ftp_proxy=http://webcache:3128/
+
+ +
To do this conversion I developed a perl script that will execute +the javascript fragment in the WPAD file and return the proxy that +would be used for +http://www.debian.org/, +and insert this extracted proxy URL in /etc/environment and +/etc/apt/apt.conf. The perl script wpad-extract work just +fine in Squeeze, but in Wheezy the library it need to run the +javascript code is no longer +able to build because the C library it depended on is now a C++ +library. I hope someone find a solution to that problem before Wheezy +is frozen. An alternative would be for us to rewrite wpad-extract to +use some other javascript library currently working in Wheezy, but no +known alternative is known at the moment.
+ +
This automatic proxy system allow the roaming workstation (aka +laptop) setup in Debian Edu/Squeeze to use the proxy when the laptop +is connected to the backbone network in a Debian Edu setup, and to +automatically use any proxy present and announced using the WPAD +feature when it is connected to other networks. And if no proxy is +announced, direct connections will be used instead.
+ +
Silently using a proxy announced on the network might be a privacy +or security problem. But those controlling DHCP and DNS on a network +could just as easily set up a transparent proxy, and force all HTTP +and FTP connections to use a proxy anyway, so I consider that +distinction to be academic. If you are afraid of using the wrong +proxy, you should avoid connecting to the network in question in the +first place. In Debian Edu, the proxy setup is updated using dhcp and +ifupdown hooks, to make sure the configuration is updated every time +the network setup changes.
+ +The WPAD system is documented in a +IETF +draft and a +Wikipedia +page for those that want to learn more. + +
+
+ + + Tags: debian edu, english. + + +
+
+
+

@@ -6701,7 +6791,7 @@ vil ha det.

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diff --git a/blog/tags/debian/index.html b/blog/tags/debian/index.html index e0e9f83b9b..2cf9c53294 100644 --- a/blog/tags/debian/index.html +++ b/blog/tags/debian/index.html @@ -4310,7 +4310,7 @@ outdated.

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diff --git a/blog/tags/digistan/index.html b/blog/tags/digistan/index.html index 3fd7d873b5..8bf6fe75be 100644 --- a/blog/tags/digistan/index.html +++ b/blog/tags/digistan/index.html @@ -993,7 +993,7 @@ scared by the sketchy form of the current pages. :)

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@@ -1114,11 +1114,11 @@ scared by the sketchy form of the current pages. :)

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diff --git a/blog/tags/english/english.rss b/blog/tags/english/english.rss index a571261888..2f1926f5b5 100644 --- a/blog/tags/english/english.rss +++ b/blog/tags/english/english.rss @@ -6980,5 +6980,83 @@ Perhaps you too can use it to save some power? + + Automatic proxy configuration with Debian Edu / Skolelinux + http://people.skolelinux.org/pere/blog/Automatic_proxy_configuration_with_Debian_Edu___Skolelinux.html + http://people.skolelinux.org/pere/blog/Automatic_proxy_configuration_with_Debian_Edu___Skolelinux.html + Mon, 13 Feb 2012 23:40:00 +0100 + New in the Squeeze version of +<a href="http://www.skolelinux.org/">Debian Edu / Skolelinux</a> is the +ability for clients to automatically configure their proxy settings +based on their environment. We want all systems on the client to use +the WPAD based proxy definition fetched from <tt>http://wpad/wpad.dat</tt>, to +allow sites to control the proxy setting from a central place and make +sure clients do not have hard coded proxy settings. The schools can +change the global proxy setting by editing +<tt>tjener:/etc/debian-edu/www/wpad.dat</tt> and the change propagate +to all Debian Edu clients in the network. + +The problem is that some systems do not understand the WPAD system. +In other words, how do one get from a WPAD file like this (this is a +simple one, they can run arbitrary code): + +<blockquote><pre> +function FindProxyForURL(url, host) +{ + if (!isResolvable(host) || + isPlainHostName(host) || + dnsDomainIs(host, ".intern")) + return "DIRECT"; + else + return "PROXY webcache:3128; DIRECT"; +} +</pre></blockquote> + +to a proxy setting in the process environment looking like this: + +<blockquote><pre> +http_proxy=http://webcache:3128/ +ftp_proxy=http://webcache:3128/ +</pre></blockquote> + +To do this conversion I developed a perl script that will execute +the javascript fragment in the WPAD file and return the proxy that +would be used for +<tt><a href="http://www.debian.org/">http://www.debian.org/</a></tt>, +and insert this extracted proxy URL in <tt>/etc/environment</tt> and +<tt>/etc/apt/apt.conf</tt>. The perl script wpad-extract work just +fine in Squeeze, but in Wheezy the library it need to run the +javascript code is <a href="http://bugs.debian.org/631045">no longer +able to build</a> because the C library it depended on is now a C++ +library. I hope someone find a solution to that problem before Wheezy +is frozen. An alternative would be for us to rewrite wpad-extract to +use some other javascript library currently working in Wheezy, but no +known alternative is known at the moment. + +This automatic proxy system allow the roaming workstation (aka +laptop) setup in Debian Edu/Squeeze to use the proxy when the laptop +is connected to the backbone network in a Debian Edu setup, and to +automatically use any proxy present and announced using the WPAD +feature when it is connected to other networks. And if no proxy is +announced, direct connections will be used instead. + +Silently using a proxy announced on the network might be a privacy +or security problem. But those controlling DHCP and DNS on a network +could just as easily set up a transparent proxy, and force all HTTP +and FTP connections to use a proxy anyway, so I consider that +distinction to be academic. If you are afraid of using the wrong +proxy, you should avoid connecting to the network in question in the +first place. In Debian Edu, the proxy setup is updated using dhcp and +ifupdown hooks, to make sure the configuration is updated every time +the network setup changes. + +The WPAD system is documented in a +<a href="http://tools.ietf.org/html/draft-ietf-wrec-wpad-01">IETF +draft</a> and a +<a href="http://en.wikipedia.org/wiki/Web_Proxy_Autodiscovery_Protocol">Wikipedia +page</a> for those that want to learn more. + + + diff --git a/blog/tags/english/index.html b/blog/tags/english/index.html index ba3c4d65c0..818fd4623e 100644 --- a/blog/tags/english/index.html +++ b/blog/tags/english/index.html @@ -8254,6 +8254,96 @@ Perhaps you too can use it to save some power?

+
+
+ Automatic proxy configuration with Debian Edu / Skolelinux +
+
+ 13th February 2012 +
+
+
New in the Squeeze version of +Debian Edu / Skolelinux is the +ability for clients to automatically configure their proxy settings +based on their environment. We want all systems on the client to use +the WPAD based proxy definition fetched from http://wpad/wpad.dat, to +allow sites to control the proxy setting from a central place and make +sure clients do not have hard coded proxy settings. The schools can +change the global proxy setting by editing +tjener:/etc/debian-edu/www/wpad.dat and the change propagate +to all Debian Edu clients in the network.
+ +
The problem is that some systems do not understand the WPAD system. +In other words, how do one get from a WPAD file like this (this is a +simple one, they can run arbitrary code):
+ +
+function FindProxyForURL(url, host)
+{
+ if (!isResolvable(host) ||
+ isPlainHostName(host) ||
+ dnsDomainIs(host, ".intern"))
+ return "DIRECT";
+ else
+ return "PROXY webcache:3128; DIRECT";
+}
+
+ +
to a proxy setting in the process environment looking like this:
+ +
+http_proxy=http://webcache:3128/
+ftp_proxy=http://webcache:3128/
+
+ +
To do this conversion I developed a perl script that will execute +the javascript fragment in the WPAD file and return the proxy that +would be used for +http://www.debian.org/, +and insert this extracted proxy URL in /etc/environment and +/etc/apt/apt.conf. The perl script wpad-extract work just +fine in Squeeze, but in Wheezy the library it need to run the +javascript code is no longer +able to build because the C library it depended on is now a C++ +library. I hope someone find a solution to that problem before Wheezy +is frozen. An alternative would be for us to rewrite wpad-extract to +use some other javascript library currently working in Wheezy, but no +known alternative is known at the moment.
+ +
This automatic proxy system allow the roaming workstation (aka +laptop) setup in Debian Edu/Squeeze to use the proxy when the laptop +is connected to the backbone network in a Debian Edu setup, and to +automatically use any proxy present and announced using the WPAD +feature when it is connected to other networks. And if no proxy is +announced, direct connections will be used instead.
+ +
Silently using a proxy announced on the network might be a privacy +or security problem. But those controlling DHCP and DNS on a network +could just as easily set up a transparent proxy, and force all HTTP +and FTP connections to use a proxy anyway, so I consider that +distinction to be academic. If you are afraid of using the wrong +proxy, you should avoid connecting to the network in question in the +first place. In Debian Edu, the proxy setup is updated using dhcp and +ifupdown hooks, to make sure the configuration is updated every time +the network setup changes.
+ +The WPAD system is documented in a +IETF +draft and a +Wikipedia +page for those that want to learn more. + +
+
+ + + Tags: debian edu, english. + + +
+
+
+

@@ -8267,7 +8357,7 @@ Perhaps you too can use it to save some power?

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diff --git a/blog/tags/fiksgatami/index.html b/blog/tags/fiksgatami/index.html index 1d10ae6cd8..bfe02f5d52 100644 --- a/blog/tags/fiksgatami/index.html +++ b/blog/tags/fiksgatami/index.html @@ -889,7 +889,7 @@ Open311 og dermed slippe Ã¥ hÃ¥ndtere meldingene som epost.

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@@ -1010,11 +1010,11 @@ Open311 og dermed slippe Ã¥ hÃ¥ndtere meldingene som epost.

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diff --git a/blog/tags/fildeling/index.html b/blog/tags/fildeling/index.html index e02faaf06c..45ad865a4a 100644 --- a/blog/tags/fildeling/index.html +++ b/blog/tags/fildeling/index.html @@ -635,7 +635,7 @@ fÃ¸re til at flere tar i bruk fri programvare.

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@@ -756,11 +756,11 @@ fÃ¸re til at flere tar i bruk fri programvare.

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diff --git a/blog/tags/intervju/index.html b/blog/tags/intervju/index.html index 9aa1690d7f..de41daab32 100644 --- a/blog/tags/intervju/index.html +++ b/blog/tags/intervju/index.html @@ -1440,7 +1440,7 @@ vil ha det.

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diff --git a/blog/tags/kart/index.html b/blog/tags/kart/index.html index 61b88fc6d3..80b336b180 100644 --- a/blog/tags/kart/index.html +++ b/blog/tags/kart/index.html @@ -1007,7 +1007,7 @@ Finnmarksvidda) ikke fungerer. Vet ikke hva det kommer av.

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@@ -1128,11 +1128,11 @@ Finnmarksvidda) ikke fungerer. Vet ikke hva det kommer av.

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diff --git a/blog/tags/ldap/index.html b/blog/tags/ldap/index.html index 022f7f6711..a54dc05d61 100644 --- a/blog/tags/ldap/index.html +++ b/blog/tags/ldap/index.html @@ -951,7 +951,7 @@ auxiliary object class.

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@@ -1072,11 +1072,11 @@ auxiliary object class.

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diff --git a/blog/tags/lenker/index.html b/blog/tags/lenker/index.html index 4bf5b86d65..948fa61a38 100644 --- a/blog/tags/lenker/index.html +++ b/blog/tags/lenker/index.html @@ -186,7 +186,7 @@ forslag for et rent og sikkert Internet.
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diff --git a/blog/tags/ltsp/index.html b/blog/tags/ltsp/index.html index 4e23219f5f..0dd695f14f 100644 --- a/blog/tags/ltsp/index.html +++ b/blog/tags/ltsp/index.html @@ -67,7 +67,7 @@ of these cards.

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diff --git a/blog/tags/multimedia/index.html b/blog/tags/multimedia/index.html index 2e0dcb9e82..f42367737d 100644 --- a/blog/tags/multimedia/index.html +++ b/blog/tags/multimedia/index.html @@ -878,7 +878,7 @@ meningslÃ¸s.

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diff --git a/blog/tags/norsk/index.html b/blog/tags/norsk/index.html index 206279d2ad..0278c05c12 100644 --- a/blog/tags/norsk/index.html +++ b/blog/tags/norsk/index.html @@ -8925,7 +8925,7 @@ vil ha det.

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diff --git a/blog/tags/personvern/index.html b/blog/tags/personvern/index.html index 7023e2b47d..59c7ac08e5 100644 --- a/blog/tags/personvern/index.html +++ b/blog/tags/personvern/index.html @@ -2719,7 +2719,7 @@ til aktuelle artikler og innlegg om temaet.

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diff --git a/blog/tags/reprap/index.html b/blog/tags/reprap/index.html index 078d2edd27..2e3d92e67a 100644 --- a/blog/tags/reprap/index.html +++ b/blog/tags/reprap/index.html @@ -529,7 +529,7 @@ very cool 3D scanner.

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diff --git a/blog/tags/rfid/index.html b/blog/tags/rfid/index.html index 358283c04a..b200df7adc 100644 --- a/blog/tags/rfid/index.html +++ b/blog/tags/rfid/index.html @@ -152,7 +152,7 @@ i 2007. Det er i dag mulig Ã¥ klone slike kort.

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diff --git a/blog/tags/sikkerhet/index.html b/blog/tags/sikkerhet/index.html index 3913168291..8e0795e7e2 100644 --- a/blog/tags/sikkerhet/index.html +++ b/blog/tags/sikkerhet/index.html @@ -1485,7 +1485,7 @@ for their packages.

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diff --git a/blog/tags/sitesummary/index.html b/blog/tags/sitesummary/index.html index 614a874557..08f5ffdc49 100644 --- a/blog/tags/sitesummary/index.html +++ b/blog/tags/sitesummary/index.html @@ -261,7 +261,7 @@ original text, and have added it to the text now.

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diff --git a/blog/tags/standard/index.html b/blog/tags/standard/index.html index 64e0ac9526..ab3fe482cd 100644 --- a/blog/tags/standard/index.html +++ b/blog/tags/standard/index.html @@ -1911,7 +1911,7 @@ provided by external plugins like the Flash plugins.

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diff --git a/blog/tags/stortinget/index.html b/blog/tags/stortinget/index.html index b03e92cd1a..c2453bc857 100644 --- a/blog/tags/stortinget/index.html +++ b/blog/tags/stortinget/index.html @@ -251,7 +251,7 @@ utviklingstimer for Ã¥ en norsk portal pÃ¥ plass.

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diff --git a/blog/tags/surveillance/index.html b/blog/tags/surveillance/index.html index a2b5997ad0..4a42511df5 100644 --- a/blog/tags/surveillance/index.html +++ b/blog/tags/surveillance/index.html @@ -517,7 +517,7 @@ jeg tror bidrar til Ã¥ holde ekstreme holdninger i sjakk.

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debian edu (74)
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debian edu (75)

digistan (7)
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english (105)
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english (106)

fiksgatami (13)
diff --git a/blog/tags/valg/index.html b/blog/tags/valg/index.html index f2f5e4c641..672a2c2f14 100644 --- a/blog/tags/valg/index.html +++ b/blog/tags/valg/index.html @@ -347,7 +347,7 @@ valgsystemet.

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@@ -468,11 +468,11 @@ valgsystemet.

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debian edu (74)
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debian edu (75)

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english (105)
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english (106)

fiksgatami (13)
diff --git a/blog/tags/video/index.html b/blog/tags/video/index.html index 68ba35c43b..61966c3ccd 100644 --- a/blog/tags/video/index.html +++ b/blog/tags/video/index.html @@ -1419,7 +1419,7 @@ meningslÃ¸s.

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February (4)
@@ -1540,11 +1540,11 @@ meningslÃ¸s.

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debian edu (74)
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debian edu (75)

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english (105)
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english (106)

fiksgatami (13)
diff --git a/blog/tags/vitenskap/index.html b/blog/tags/vitenskap/index.html index 6cb0faa083..8c4032d4a5 100644 --- a/blog/tags/vitenskap/index.html +++ b/blog/tags/vitenskap/index.html @@ -121,7 +121,7 @@ skyskrapere. Takke meg til en tur til mÃ¥nen.

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@@ -242,11 +242,11 @@ skyskrapere. Takke meg til en tur til mÃ¥nen.

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debian edu (74)
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debian edu (75)

digistan (7)
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english (105)
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english (106)

fiksgatami (13)
diff --git a/blog/tags/web/index.html b/blog/tags/web/index.html index 1f33ef159d..f0d487442d 100644 --- a/blog/tags/web/index.html +++ b/blog/tags/web/index.html @@ -1075,7 +1075,7 @@ from within Iceweasel instead.

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February (4)
@@ -1196,11 +1196,11 @@ from within Iceweasel instead.

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debian edu (75)

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+ Petter Reinholdtsen + +

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