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Is there a way to check every packet leaving the system for sensitive data like IP addresses, personal information (like logins) etc ?

A free (and preferably open source) program which does this for Linux would be great.

Otherwise, where would I start to go about coding something like this ?

  • Can you clarify whether you're asking for something that will do this for a single computer you control, or for an entire network? – Xander Apr 3 '15 at 16:10
  • Are you concerned about accidental leaks or about malicious leaks? These are completely different scenarios. – Gilles 'SO- stop being evil' Apr 3 '15 at 20:03
  • @Xander for a single computer. – Grim Reaper Apr 4 '15 at 2:37
  • @Gilles Accidental leaks being the data transmitted by email clients, chat software etc ? then yes, its intended for that. – Grim Reaper Apr 4 '15 at 2:39
  • Accidental as in an employee accidentally sends the customer list to joe@competitor.com instead of joe@yourcompany.com. Deliberate as in a disgruntled employee sends the customer list on wilileaks.org over a VPN that they installed for this purpose. – Gilles 'SO- stop being evil' Apr 4 '15 at 13:21
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What you're looking for is network data loss prevention.

There are some costly solutions from Code Green Networks, Symantec, etc. One free and GNU GPL-licensed ones is MyDLP (specifically you'll want the MyDLP-Network product) that does this.

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You can use wireshark for sniffing packets and getting every kind of information from that.

Wireshark is opensource project
Check out its official page: https://www.wireshark.org/

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  • Poor man's version of that network sniffer is at tcpdump.org – ott-- Apr 3 '15 at 20:33

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