Questions tagged [content-filter]
The content-filter tag has no usage guidance.
57
questions
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4
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208
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What is the proper way to block entire TLDs using iptables?
With new TLDs being approved like .zip that could be extremely malicious, it seems prudent to have the ability to block entire TLDs on tap. What is the proper way to do this in iptables?
- 109
1
vote
0
answers
80
views
Before-queue Content Filter won't inject data back to Postfix
I have been building a before-queue filter with Postfix on NodeJS to retrieve the data from outgoing mails, remove the attachments, upload them on a CDN and inject back the URLs in the outgoing mail.
...
- 11
0
votes
1
answer
996
views
How it works content_filter in Postfix using spamassassin and clamav ( filtering order )?
How it works content_filter in case where is used spamassassin and clamav ?
Here is example for one content_filter: http://www.postfix.org/FILTER_README.html
And I see that sendmail command cant use ...
- 41
0
votes
1
answer
538
views
Is it possible to use nginx stream to filter SSH connections?
I'm trying to setup a nginx egress proxy so that all the SSH connections to a specific group of hosts (*.example.com) go through the proxy. I have a local DNS server, where I resolve such hosts to the ...
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1
vote
1
answer
346
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Postfix content filter (spamassassin) get's bypassed
Lately we're receiving a lot of Japanese spam messages, containing weird headers. At least, it looks like a mail is remotely offered, but the mail is handled as if it was sent internally, which ...
- 173
0
votes
0
answers
376
views
Tomcat fiilter traffic basing on bad mime type
I have spotted recently a large amount of malicious traffic causing throwing an errors on our Grails app. It is hosted via tomcat:
ERROR grails.plugin.cache.web.filter.simple....
- 113
0
votes
1
answer
12k
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Whitelisting Google Recaptcha
Barracuda Web Filter blocking the Google Recaptcha on one of our vendors sites.
We have tested with an unfiltered user to verify that it's the webfilter blocking
Searched for what to whitelist, the ...
- 101
0
votes
2
answers
4k
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TLS for spesific relayhost on postfix
i want to implement advance content filtering in postfix using python. I have figured it out the implementation from http://www.postfix.org/FILTER_README.html. but there is another problem, after the ...
- 593
1
vote
1
answer
792
views
Mobile sent emails don't get added disclaimer
my company wanted to have a footer added to all emails based on sender's address. We have successfully implemented it based on this article https://www.howtoforge.com/how-to-automatically-add-a-...
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1
vote
1
answer
3k
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How does the zScaler cookie authentication work?
I'm implementing a web filter for my organization and I'm considering zScaler. I do not want to use proxy PAC file. I just got off the phone with zScaler's sales and they claim that they can ...
- 13
2
votes
2
answers
2k
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how do i turn off postfix bounce notice
In main.cf currently I have
notify_classes = delay, policy, protocol, resource, software
bounce_notice_recipient =
2bounce_notice_recipient =
Followed another thread, and it recommends setting ...
- 31
0
votes
1
answer
69
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What are the basic steps to start blocking spam on an internal Exchange 2016 server? [duplicate]
Recently I have taken over as both onsite IT and also head of our internal IT as the last IT guy resigned on my second day. Currently they just switched to an internal Exchange 2016 server and they're ...
1
vote
1
answer
524
views
is it possible to block a certain facebook or twitter account via firewall or proxy?
I would like to block/filter/censure certain social network users witch content may be offensive or violent, so that people inside my LAN ( say school ) will have access to the main site,
for example ...
- 113
0
votes
2
answers
826
views
iptables search in web content
How can I set an iptables rule (ex:in input chain) that check the http packet's content and block that contain my html or css or javascript code?
For example: block sites that return in their response
...
- 1
2
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3
answers
2k
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Filter HTTPS content & enforce Captive Portal without MITM proxy
My church wants to start providing free WiFi to our guests, but with 2 requirements:
Inappropriate content (such as Pornography and Warez) must be filtered out.
The end-user must create an account ...
- 358
2
votes
0
answers
2k
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Exchange 2013: content filtering bypass
I have just completed a migration from a single Exchange 2007 to 2xExchange 2013 servers in separate sites. Mailflow is working correctly, but the anti-spam content filtering is not working as ...
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2
votes
1
answer
2k
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mail command : does content-filter in postfix works?
I use Postfix in my machine (linux).
When i send a mail to a local user with telnet localhost 25 in command line, my mail is parsed by a content-filter (for example: spamassassin) => no problem.
But ...
- 123
1
vote
1
answer
3k
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Blocking HTTPS content with a Watchguard (Websense) vs. SQUID and SQUIDGuard using Transparent Proxy mode
I'm trying to compare these 2 solutions when it comes to content blocking :
1 - A pFSense appliance with SQUID and SQUIDGUARD packages configured
2 - A Watchguard FW that uses Websense
So, in order ...
- 81
0
votes
1
answer
4k
views
Bypass squid proxy [closed]
I have a transparent squid proxy that I am using to filter out ads from web traffic which works well enough, however I would like to have the option of bypassing the proxy as well at times when I do ...
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3
votes
1
answer
5k
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Postfix After-Queue Content Filter, advanced filter not working
I followed the instructions in the postfix website on how to setup a content filter, I got the simple example up and running fairly quick, but after long hours of struggle I couldnt get the advanced ...
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0
votes
1
answer
34
views
are there downsides to hosting an .exe file on a linux server [closed]
Client has decided to use a technology that has an "offline" version using an .exe file on a web server.
Is there any downside to hosting an .exe file, ie. may it get you blocked or rated/ marked in ...
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2
votes
1
answer
2k
views
Content filter on exchange 2013 - not working as expected
I just setup a new ex2013 server, and we have an upstream spam filter that adds the word "[SPAM]" to the subject line if it suspect incoming spam.
I want to configure my ex2013 server to delete any ...
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1
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690
views
Make a copy of email using pipe in postfix alongside 1 content_filter
I am using postfix and already usHi. I am using postfix and already using a script as a content_filter which re-injects back to smtpd to all users, but before this happens, I would like to make a copy ...
-3
votes
1
answer
154
views
Guest access through hotspots (proxies with a ToS to accept) don't consistently work [closed]
I've noticed that certain websites (Facebook) don't reliably initiate a hotspot login when compared to others (google.com). In other words, when a user connects for the first time to a hotspot they ...
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3
votes
3
answers
2k
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BYOD and Google SSL
I run a school network with a BYOD program in place. I have a linux proxy (squid) with content filtering by Mind (fork of dansguardian). Everything works fine over HTTP, the problem is of corse when ...
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1
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2k
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dnsmasq content filter [closed]
Is it possible so use dnsmasq as a selective content filter (just for specified clients - defined by their MAC address)
I know how to create a global content filter.
I know that a proxy should be ...
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2
votes
1
answer
2k
views
How To Enable HTTPS filtering with Squid3 and Qlproxy?
I'm trying to set my proxy to filter HTTPS traffic just like the HTTP traffic.
I have followed this guide for setup SSLBump
If I set it, even the HTTP traffic won't be accepted through the proxy.
...
- 1,695
2
votes
1
answer
237
views
Is there any application/firewall to detect content scrapers? [closed]
We are noticing that a significant amount of web traffic is from content scrapers (determined due to their crawling pattern). They are useless visitors to us but consume a lot of our resources (...
- 93
0
votes
1
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614
views
Manually set Reply-To header in postfix
I have a legacy application that emails via php.
5% of the emails aren't going through. The solution is to route all email through a fancy verified mail server like Amazon's SES. I am having some ...
- 204
0
votes
1
answer
536
views
Do not allow internet connection for users that have set a proxy in their browser
I installed dansguardian in my Linux server. Everything works well except one thing: if a user sets a different proxy (outside my LAN) in his browser, he'll be able to bypass dansguardian. Can anybody ...
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3
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1k
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postfix php filter
I'm trying to filter email using a php script, what I want to do is process the email into a database when it matches a set of rules.
The rules are going to be made using an array of PHP strings and ...
0
votes
1
answer
613
views
DansGuardian: content regexp list for exact sites, how?
We have contentregexplist file where we can write all substitutions like "source
regex"->"dest string"
And they ALL run for each page. Is it possible somehow to define a domain name(s) for which (...
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1
answer
9k
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Exchange 2010 Global "Safe Senders" list, avoid blocking images from corporate domain?
I've created an email template that is used in our Process Automation software to send out email updates for various reasons. I've included our corporate logo via an IMG tag with a src pointing to ...
- 275
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votes
2
answers
250
views
Category based content filtering for main and remote sites
Problem: I have one main location and about 5 remote sites. The remote sites use the DNS at the main location but have their own internet connection. I would like to implement something at the main ...
- 1,384
1
vote
2
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208
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Small business, affordable content filter for windows domain controller? [closed]
Our church has been gifted an old Dell Poweredge box which we'd like to use as a DC and content filter for our LAN.
We have about 5 PCs on site full time which will make use of the DC and access it's ...
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1
answer
1k
views
Is it possible to use another blacklist with Qlproxy? (QuintoLabs Content Security)
Im using the Qlproxy content filter. It use the urlblacklist. But that blacklist is full of false positives! Is there a better black list? How to use it with qlproxy?
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1
answer
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Exchange 2010 and FPE Content Filtering
I have a box running Server 2008 R2, Exchange 2010 SP1, and Forefront Protection for Exchange 2010.
The issue is that I cannot for the life of me get my content filters to quarantine a single message ...
0
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2
answers
1k
views
Is there a open source captive portal with category based content filtering available?
I was thinking about deploying pfSense but then I realized there isn't a solid content filtering option with it. I know there are some squid addons but they seem cumbersome and not fully matured. ...
- 1,384
0
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2
answers
2k
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Is it possible to filter/edit web content using Apache/Nginx/Lighttpd?
Is it possible to use any of the following HTTP servers: Apache, Nginx or Lighttpd as a proxy to make the following:
Disallow certain HTTP bodies (web pages) based on their content (e. g., words)
...
- 111
2
votes
3
answers
3k
views
Determine if user has hotfix # 981889 installed?
I want to know if a particular computer has MS HotFix #981889 installed. To do that I check file versions. This page lists file versions that the hotfix deals with. However, I cannot figure out:
Do ...
- 1,932
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votes
4
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1k
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Web filtering/Captive portal solution
I've been asked to setup access control/filtering on a network that has it's own address block (a /24). This is for students who will be connecting to the wireless network. Requirements are as follows....
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2
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4k
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Opensource Content Filtering [closed]
We are planning to introduce a web content filtering on our newly created LAN environment. I am inclined towards opensource alternatives to ISA server. I came across uTangle and they seem to have a ...
- 2,357
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1
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838
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quarantine mailbox not receiving quarantined items exchange 2010 anti-spam content filtering
On exchange 2010, i have the anti-spam features installed on the hub transport.
I have the content filtering enabled, with quarantine if the scl is higher than 7. this is the only option i have turned ...
- 1,089
0
votes
1
answer
182
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Prevent users to download web-contents with url and network exceptions via GPO
We have server 2003, AD domain. Our clients XP, and W7 with IE7 IE8 browsers.
We use two types of internet. Use the internet inside the company network, and use mobile-net at home, with the same ...
user57467
4
votes
10
answers
2k
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Block facebook even in the case users get their hands on tor, freegate and similar applications
I've been using, happily, opendns to block facebook on my network.
Then I started thinking about tricks to circumvent this block and, of course, I've read here on serverfault how to block the facebook ...
- 2,009
1
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0
answers
321
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Microsoft TMG 2010 Sp1 override if authenticated?
I have a TMG 2010 SP1 server running on Server 2008 R2 in a single-NIC configuration - not live yet.
I will be allowing web access in three fashions:
one method is using the TMG as the
default ...
- 1,278
0
votes
2
answers
776
views
Restricting Internet access for Windows users using Ubuntu Server + Webmin [closed]
I want to restrict the Internet usage for a couple of Windows users on a network. The Server is a Ubuntu 10.04 Server running Webmin - all Windows users are setup as users on the Ubuntu server to ...
- 317
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2
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1k
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Web filtering (Proxy or DNS) with option for users to ignore the block
We are struggling with our users visiting infected or "attack" sites and Phising in general. Most of our machines are protected by an Enterprise anti virus and monitoring solution (McAffe ePO) and we ...
- 4,987
0
votes
2
answers
218
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Web Content Filtering
I have recently bought a Cisco ASA 5505 for my small business, I was initially led to believe this device could do some limited website filtering that we would need. (one list of unrestricted, and a ...
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2
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0
answers
412
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Exchange 2007 delivering messages flagged as SPAM
I have an SBS 2008 box running Exchange 2007. Mail is delivered directly to the Exchange machine from the Internet via a receive connector (I have already advised people that it would be better to use ...
- 21