Questions tagged [content-filter]

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Postfix: Default action for content filter

Assuming an "Advanced after-queue content filter" setup /etc/postfix/main.cf: content_filter = scan:localhost:10025 Can a default action be configured, if the content filter does not accept emails ...
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1answer
61 views

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 ...
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34 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....
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1answer
3k views

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 ...
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1answer
480 views

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 ...
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1answer
305 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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1answer
1k views

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 ...
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1answer
686 views

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 ...
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1answer
65 views

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 ...
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1answer
367 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 ...
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2answers
500 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 ...
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3answers
2k views

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 ...
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0answers
1k views

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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1answer
954 views

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 ...
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1answer
3k views

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 ...
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1answer
3k 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 ...
3
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1answer
3k views

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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1answer
31 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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1answer
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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1answer
527 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 ...
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1answer
146 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 ...
3
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3answers
2k views

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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1answer
1k views

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 ...
2
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1answer
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. ...
2
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1answer
209 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 (...
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1answer
538 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 ...
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1answer
323 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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4answers
1k views

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
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1answer
579 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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1answer
8k views

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 ...
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2answers
242 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 ...
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2answers
205 views

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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1answer
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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1answer
2k views

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 ...
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2answers
957 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. ...
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2answers
1k views

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) ...
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3answers
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 ...
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4answers
1k views

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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2answers
4k views

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 ...
0
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1answer
823 views

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 ...
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1answer
176 views

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 ...
4
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10answers
2k views

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 ...
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0answers
317 views

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 ...
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2answers
745 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 ...
1
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2answers
1k views

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 ...
0
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2answers
213 views

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 ...
2
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0answers
405 views

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 ...
2
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2answers
4k views

Log and Block Website using Windows 2008 SBS

A client has asked me to setup Windows 2008 SBS to block and log websites from a list they will provide. As far as I know they only have standard edition which means I cannot use ISA. I was thinking ...
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4answers
2k views

Why would a web server set the content type of a redirect to application\octet-stream

I have taken steps to prevent software from being downloaded from the Internet as it was being abused by students. This was implemented using ISA 2006's Content Type filter condition "Application". ...
3
votes
4answers
4k views

Open Source project that does SSL Inspection

I've been assigned to research out and spec replacing our old and decrepit http content filtering system. There are several open source filtering packages available but I've not come across one that ...