blocking user agents via IPTables?


Recommended Posts

What proxy are you using. I don't see how you could do with that sort of thing without a proxy, or layer 7 type of firewall. So what are you using to filter/block? Or is this on your server and your wanting to block specific useragents from accessing your service/httpd?

You need Layer 7 support 

 

http://l7-filter.sourceforge.net/ might help with that.

 

If I remember rightly it uses REGEX to match which is a bit of pain to get right (Well that could just be I'm not very good at writing regex patterns)

  On 05/08/2014 at 13:54, BudMan said:

What proxy are you using. I don't see how you could do with that sort of thing without a proxy, or layer 7 type of firewall. So what are you using to filter/block? Or is this on your server and your wanting to block specific useragents from accessing your service/httpd?

correct this is my proxy server (squid), but everyone is going via the server to access the internet so there is a linux machine between the clients and the interwebs so I was going to use IP tables to block everything but (lets say safari) if they are not using safari not forwarding to the interwebs

 

to summarise to clear up confusion

 

user -> server (IPtables->squid) -> internet

in squid its simple acl that matches the UA you want to allow, and deny all others.

acl aclname browser [-i] regexp ...

# pattern match on User-Agent header (see also req_header below) [fast]

acl aclname req_header header-name [-i] any\.regex\.here

# regex match against any of the known request headers. May be

# thought of as a superset of "browser", "referer" and "mime-type"

# ACL [fast]

  On 05/08/2014 at 14:40, BudMan said:

in squid its simple acl that matches the UA you want to allow, and deny all others.

acl aclname browser [-i] regexp ...

# pattern match on User-Agent header (see also req_header below) [fast]

acl aclname req_header header-name [-i] any\.regex\.here

# regex match against any of the known request headers. May be

# thought of as a superset of "browser", "referer" and "mime-type"

# ACL [fast]

ok I will do it this way then thanks :) was actually just trying it out but I cannot seem to get it working... do you have an example (e.g.... MSIE?) or a useful link?

do google for blocking browser useragent squid and you should find a couple of walk thru's - you are running what version of squid? I recall a previous thread with you about squid and you were running really old version - but I think you updated?

  On 05/08/2014 at 15:23, BudMan said:

do google for blocking browser useragent squid and you should find a couple of walk thru's - you are running what version of squid? I recall a previous thread with you about squid and you were running really old version - but I think you updated?

*cough* I am still using squid 2.4 :D I have latest squid 3 on the system from the other thread but for now this one is using 2.4. I will most likely upgrade after I have the browsers blocked

Well 2.4 doesn't have the acls - believe they were added in 2.6, so like that last thread would explain why not working. At a loss to why anyone would be using such an old version?? 2.4 is like 2002 ;)

  On 05/08/2014 at 15:37, BudMan said:

Well 2.4 doesn't have the acls - believe they were added in 2.6, so like that last thread would explain why not working. At a loss to why anyone would be using such an old version?? 2.4 is like 2002 ;)

ah I meant i am using 2.7!? :p I am using the acls for blocking sites, but I cannot seem to get the blocking of browsers, just donot think I know enough about squid to block them/get it working http://gaugusch.at/squid.shtml i tried this guide but seemed to cause me issues

Well that should work then.. But still why not using current 3.4? At a loss why anyone - especially in security area type software would use outdated versions, I can see being a version behind or so.. But 2.7 was released in 2008, and last change I see to that branch was 2011

  On 05/08/2014 at 15:45, BudMan said:

Well that should work then.. But still why not using current 3.4? At a loss why anyone - especially in security area type software would use outdated versions, I can see being a version behind or so.. But 2.7 was released in 2008, and last change I see to that branch was 2011

 

I will be upgrading, very shortly once i work out exactly what I need to do, I do not want to upgrade half way through experimenting for it not to work and me be confused as to why once I have finished this task and have the my prototype setup I will upgrade and will only use squid3 from then on (I also used squid 2.7 caching as squid3 cache refused to work if you remember from my previous post, and I could not seem to solve it) either way! im going to have to keep trying this out

  On 05/08/2014 at 15:45, BudMan said:

Well that should work then.. But still why not using current 3.4? At a loss why anyone - especially in security area type software would use outdated versions, I can see being a version behind or so.. But 2.7 was released in 2008, and last change I see to that branch was 2011

got it working! (upgrading tomorrow)

  On 05/08/2014 at 16:39, BudMan said:

so what were you doing wrong for the next guy that might have same sort of issue?

ah good point probably should say, thank you for reminding me.

 

the httpd_accel comman in the guide was not liked by squid in a very much shortened version of his guide assuming you can connect via the proxy just put this in under acl CONNECT method CONNECT line tested on an older MSIE version and it 403 errored tried it on chrome worked fine

 

acl CONNECT method CONNECT

acl ie_browser browser ^Mozilla/4\.0 .compatible; MSIE 

acl bad_browser browser ^Gator

http_access deny bad_browser

http_access deny ie_browser

http_access allow manager localhost #you will have this bold config already in place do not copy this over your working config

http_access deny manager

http_access deny !Safe_ports

http_access deny CONNECT !SSL_ports

http_access deny to_localhost

http_access allow localhost

http_access deny all

http_reply_access allow all

icp_access allow all

cache_mgr hostmaster@mycompany.at

append_domain .mycompany.at

deny_info ERR_IEBROWSER ie_browser

wccp_router 172.16.0.1

ie_refresh on

This topic is now closed to further replies.
  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Posts

    • Minor Problems over the years with Windows 11 Pro on my original Intel 10700 Desktop i was using and not many problems on my Newer AMD Ryzen 7 7700X. Overall Windows 11 works extremely well, if don't do too many modifications, and do the regular security updates, and keep 3rd party apps up to date, and users shouldn't have any issues, and if a user does, should be a minor little issue that is easily fixable My goal is to have the 2 remaining household systems replaced for Windows 11 Compatible machines, hopefully by early September if not sooner.
    • Bill Gates says he'll donate 99 percent of his wealth to Africa by Hamid Ganji Microsoft co-founder and tech billionaire Bill Gates has pledged to donate a significant chunk of his personal wealth to African countries. As reported by the BBC, Gates's funding will be spent on improving health and education infrastructure in Africa over the next twenty years. The Gates Foundation has played an active role in improving public health and education in Africa over the past decades. Bill Gates aims to double down on that effort by donating most of his fortune to Africa. Last month, he also said that 99% of his fortune, which could exceed $200 billion, will go to African countries by 2045. Speaking at the African Union (AU) headquarters in Ethiopia's capital, Addis Ababa, Gates said, "By unleashing human potential through health and education, every country in Africa should be on a path to prosperity." The tech billionaire also told young African innovators to start relying on AI to improve health and education in their countries and use the technology to benefit the entire continent. He introduced Rwanda as a successful example of using AI in healthcare to identify high-risk pregnancies. "Africa largely skipped traditional banking and now you have a chance, as you build your next generation healthcare systems, to think about how AI is built into that," Gates added. By donating 99 percent of his personal fortune by 2045, Bill Gates can still maintain his position as one of the richest people on earth. According to Bloomberg, Gates's current net worth is around $175 billion. Gates's decision to donate 99 percent of his wealth to Africa came after the US administration cut USAID funding to African countries following the DOGE investigations. In a recent interview with the New York Times, Bill Gates called out Elon Musk for cutting the USAID budget, saying Musk has a role in the death of the poorest children on earth.
    • Very cool next level tech (for Witcher 4, CybePunk 2, etc.), but I'd be more impressed with seeing this at 4k than through a too low-bitrate YouTube ~1080p filter.
    • I was thinking, and was going to post, almost exactly what @Brandon Hjust posted!
  • Recent Achievements

    • Week One Done
      Adam Todd earned a badge
      Week One Done
    • Contributor
      Ed B went up a rank
      Contributor
    • One Month Later
      moporcho earned a badge
      One Month Later
    • One Month Later
      Parotel earned a badge
      One Month Later
    • Reacting Well
      Cryptecks earned a badge
      Reacting Well
  • Popular Contributors

    1. 1
      +primortal
      202
    2. 2
      snowy owl
      146
    3. 3
      ATLien_0
      133
    4. 4
      Xenon
      120
    5. 5
      +FloatingFatMan
      110
  • Tell a friend

    Love Neowin? Tell a friend!