Category Archives: Technology

SSL Decrypt

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There are number of ways to perform SSL Decrypt and it’s up to the programmer to decide what works best for him:

  • Using a product/SDK that isn’t modifying the SSL certificate (like SSL Decryptor) but it’s targeted per specific browser, Komodia’s SSL Decryptor works with FF and IE.
  • Using a product/SDK that performs manipulation on the SSL certificate but isn’t alerting the user (like SSL Digestor), this product is more general and works with all browsers and the popular mail clients.
  • Using open source proxy which changing the certificate and alerts the user, basically they pefrom MITM attack, using these solutions is good for debug purposes.

Barak

Firewall application layer Winsock2

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There are several ways to implement a firewall:

  • Winsock LSP – Can be used for an application layer firewall, but it’s mostly not used for various reasons.
  • TDI Driver – Mostly used for personal firewalls, according to Microsoft it will be phased out in the next OS.
  • Ndis IM – Mostly used for gateway firewalls.
  • WFP – The new plaform Microsoft is promoting, in my opinion that until XP is retired this will not gain momentum.

Barak

DNS server filtering Delphi

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When you need to filter a DNS request, there are number of ways to do it:

  • Add an entry to the hosts file.
  • Intercept the UDP data and modify it.
  • Use NSP (Named Space Provider)
  • Use detour to catch the DNS functions (there’s a post of the drawbacks of detours)

Komodia’s DNS Hijack intercepts all DNS requests before they are leaving the machine and allows the programmer to perform any lookup he desires, this can be done with any language that supports DLLs such as: C/C++, Delphi, .Net, VB

Barak

URL filtering SDK

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URL Filtering SDK are used for programmers or companies that want to develop web content filter, usually for parental control and wants to focus their development on what their clients perceive as advantage: GUI, Support, ease of use. The usage of the SDK frees up development time which is complex and time consuming.

Here at Komodia we developed our URL Filtering SDK for about 3 years. Even you’re going to implement only subset of the functionality, please allow for up to six month of development and QA, and that’s just for the basic functionality.

Barak